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Setting font family in rad entry crash app in iOS

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This is a migrated thread and some comments may be shown as answers.
Shalin
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Rank 1
Shalin asked on 15 Mar 2018, 07:13 AM
img_0026.png

hi,

I have rad list with items, one item have two RadEntrys to enter Numeric values. All elements bound to vm or item model, basic MVVM.

Font family define in App.xaml based on OS.

<OnPlatform x:TypeArguments="x:String" x:Key="PlatformBaseFontFamily">
               <On Platform="iOS" Value="San Francisco"/>
               <On Platform="Android" Value="Roboto"/>
           </OnPlatform>

if i use FontFamily="{StaticResource PlatformBaseFontFamily}" in RadEntry app crashes even if i remove Keyboard="Numeric".

my styling,

TextColor="{StaticResource BaseTextColor}" FontSize="Small" FontFamily="{StaticResource PlatformBaseFontFamily}"
                                                                       BorderStyle="{StaticResource StatRadEntryBorderStyle}

Questions:

1) How to fix this Error

2) RadEntrys in first item of list have no border around them, but other items have.(RadList Default item style in use)

Error Message

"Value cannot be null.
Parameter name: descriptor"

StackTrace

  at UIKit.UIFont._FromDescriptor (UIKit.UIFontDescriptor descriptor, System.nfloat pointSize) [0x00011] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.8.0.20/src/Xamarin.iOS/UIKit/UIFont.g.cs:106 
  at UIKit.UIFont.FromDescriptor (UIKit.UIFontDescriptor descriptor, System.nfloat pointSize) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.8.0.20/src/Xamarin.iOS/UIKit/UIFont.cs:179 
  at Telerik.XamarinForms.InputRenderer.iOS.EntryAdapter.UpdateFont (Telerik.XamarinForms.Input.RadEntry sourceOwner, Telerik.XamarinForms.InputRenderer.iOS.BorderUITextField targetOwner) [0x0007a] in <0ae6931e45b44b43b9cb8fc35622cf29>:0 
  at Telerik.XamarinForms.InputRenderer.iOS.EntryAdapter.UpdateCore (Telerik.XamarinForms.Input.RadEntry sourceOwner, Telerik.XamarinForms.InputRenderer.iOS.BorderUITextField targetOwner, System.String propertyName) [0x0003a] in <0ae6931e45b44b43b9cb8fc35622cf29>:0 
  at Telerik.XamarinForms.Common.FacadeAdapterBase`2[S,T].Update (System.Object sourceOwner, System.Object targetOwner, System.String propertyName, System.Object sourceOwnerRoot, System.Object targetOwnerRoot) [0x00000] in <be10754fe83d4f30b3bf0368f5628901>:0 
  at Telerik.XamarinForms.Common.XamarinToNativeControlExtensions.Update[T,K] (T nativeElement, K xfЕlement, System.String propertyName, System.Object sourceOwnerRoot, System.Object targetOwnerRoot) [0x00031] in <be10754fe83d4f30b3bf0368f5628901>:0 
  at Telerik.XamarinForms.InputRenderer.iOS.EntryRenderer.OnElementAttached (Telerik.XamarinForms.Input.RadEntry newElement) [0x00046] in <0ae6931e45b44b43b9cb8fc35622cf29>:0 
  at Telerik.XamarinForms.Common.iOS.IosRendererBase`2[S,T].OnElementChanged (Xamarin.Forms.Platform.iOS.ElementChangedEventArgs`1[TElement] e) [0x00037] in <be10754fe83d4f30b3bf0368f5628901>:0 
  at Xamarin.Forms.Platform.iOS.VisualElementRenderer`1[TElement].SetElement (TElement element) [0x00118] in <bc5a3d4303744676b3b36f4254bb697d>:0 
  at Xamarin.Forms.Platform.iOS.VisualElementRenderer`1[TElement].Xamarin.Forms.Platform.iOS.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00000] in <bc5a3d4303744676b3b36f4254bb697d>:0 
  at Xamarin.Forms.Platform.iOS.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x00014] in <bc5a3d4303744676b3b36f4254bb697d>:0 
  at Xamarin.Forms.Platform.iOS.VisualElementPackager.OnChildAdded (Xamarin.Forms.VisualElement view) [0x0002a] in <bc5a3d4303744676b3b36f4254bb697d>:0 
  at Xamarin.Forms.Platform.iOS.VisualElementPackager.Load () [0x0001e] in <bc5a3d4303744676b3b36f4254bb697d>:0 
  at Xamarin.Forms.Platform.iOS.VisualElementRenderer`1[TElement].SetElement (TElement element) [0x000cc] in <bc5a3d4303744676b3b36f4254bb697d>:0 
  at Xamarin.Forms.Platform.iOS.VisualElementRenderer`1[TElement].Xamarin.Forms.Platform.iOS.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00000] in <bc5a3d4303744676b3b36f4254bb697d>:0 
  at Xamarin.Forms.Platform.iOS.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x00014] in <bc5a3d4303744676b3b36f4254bb697d>:0 
  at Telerik.XamarinForms.Common.RadPlatform.GetOrCreateRenderer (Xamarin.Forms.VisualElement visualElement) [0x00012] in <be10754fe83d4f30b3bf0368f5628901>:0 
  at Telerik.XamarinForms.DataControlsRenderer.iOS.ListView.UIListViewTemplateCell.PrepareCell () [0x00008] in <c9290182597745d6888354b6899be4aa>:0 
  at Telerik.XamarinForms.DataControlsRenderer.iOS.ListView.ListViewCellRenderer.UpdateCell (Telerik.XamarinForms.DataControlsRenderer.iOS.ListView.UIListViewCell cell, System.String propertyName) [0x00008] in <c9290182597745d6888354b6899be4aa>:0 
  at Telerik.XamarinForms.DataControlsRenderer.iOS.ListView.ListViewCellRenderer.UpdateCell (TelerikUI.TKListViewReusableCell reusableCell, System.String propertyName) [0x00000] in <c9290182597745d6888354b6899be4aa>:0 
  at Telerik.XamarinForms.DataControlsRenderer.iOS.ListView.UIListViewCell.UpdateCell (Telerik.XamarinForms.DataControls.RadListView owner, System.Object dataItem) [0x00021] in <c9290182597745d6888354b6899be4aa>:0 
  at Telerik.XamarinForms.DataControlsRenderer.iOS.ListViewDataSource.InitCell (TelerikUI.TKListView listView, Foundation.NSIndexPath indexPath, TelerikUI.TKListViewCell tkCell, Foundation.NSObject obj) [0x000b1] in <c9290182597745d6888354b6899be4aa>:0 
  at Telerik.XamarinForms.DataControlsRenderer.iOS.ListViewDataSource.InitCellCallback (TelerikUI.TKListView listView, Foundation.NSIndexPath indexPath, TelerikUI.TKListViewCell tkCell, Foundation.NSObject obj) [0x00006] in <c9290182597745d6888354b6899be4aa>:0 
  at ObjCRuntime.Trampolines+SDActionArity4V1.Invoke (System.IntPtr block, System.IntPtr arg1, System.IntPtr arg2, System.IntPtr arg3, System.IntPtr arg4) [0x00030] in <5bae2bad360b4d5da328902516ddda38>:0 
  at (wrapper native-to-managed) ObjCRuntime.Trampolines+SDActionArity4V1.Invoke(intptr,intptr,intptr,intptr,intptr)
--- End of stack trace from previous location where exception was thrown ---
  at (wrapper managed-to-native) UIKit.UIApplication.UIApplicationMain(int,string[],intptr,intptr)
  at UIKit.UIApplication.Main (System.String[] args, System.IntPtr principal, System.IntPtr delegate) [0x00005] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.8.0.20/src/Xamarin.iOS/UIKit/UIApplication.cs:79 
  at UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x00038] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.8.0.20/src/Xamarin.iOS/UIKit/UIApplication.cs:63 
  at Medarbeideren.iOS.Application.Main (System.String[] args) [0x00001] in /Users/xamarindev/Documents/Medarbeideren/Medar_UI/Medarbeideren/Medarbeideren/Medarbeideren.iOS/Main.cs:17 

12 Answers, 1 is accepted

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Lance | Manager Technical Support
Telerik team
answered on 15 Mar 2018, 09:17 PM
Hi Shalin,

You'll get this error if the FontFamily value you've entered doesn't exist (which could be due to misspelling, the wrong name, or is not properly listed in your info.plist). You can find more info here in Xamarin Documentation and this blog post.


Testing Font Names

Here's an example to demonstrate that setting FontFamily works as expected when using a font name that matches available resources (you can also try this with "Courier New"):




If you're not sure about the font, you can use a plain Entry or Label control and see the result there. Once you're sure the name is correct, you can use it with RadEntry.

San Francisco

The San Francisco font is the default system font since iOS 9, you do not have to set a value if you want to use it.

However, if you do want to use it you must use the correct name:

<telerikInput:RadEntry x:Name="entry"
                FontFamily=".SFUIText"
                WatermarkText="Enter first name"/>


or you could define resources like this:

<OnPlatform x:TypeArguments="x:String" x:Key="BoldFontFamily" Android="sans-serif" iOS=".SFUIText-Bold"/>
<OnPlatform x:TypeArguments="x:String" x:Key="ThinFontFamily" Android="sans-serif-thin" iOS=".SFUIText-Light"/>
<OnPlatform x:TypeArguments="x:String" x:Key="DefaultFontFamily" Android="sans-serif" iOS=".SFUIText"/>


Wrapping Up

I think that we should try to catch this exception internally and fall back on the default font, therefore I have submitted this item on our backlog (you can upvote and follow the item).

Lastly, I have updated your Telerik points for bringing this to our attention.

Regards,
Lance | Tech Support Engineer, Sr.
Progress Telerik
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0
Shalin
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Rank 1
answered on 16 Mar 2018, 04:53 AM
img_0026.png

hi,

This is how i define platform based font size in App.xaml,

<OnPlatform x:TypeArguments="x:String" x:Key="PlatformBaseFontFamily">
               <On Platform="iOS" Value="San Francisco"/>
               <On Platform="Android" Value="Roboto"/>
           </OnPlatform>

But this is working fine in all other Xamarin controls, problem only arise in RadEntry.

Any way, there is a border issue i already mentioned.

  1. RadEntry border is not visible in first list item in iOS (see attached image)
0
Lance | Manager Technical Support
Telerik team
answered on 16 Mar 2018, 04:12 PM
Hi Shalin,

Unfortunately, I'm not able to determine what is happening with the amount of information you've provided and I'm not able to reproduce it.

If you'd like us to investigate this further, please prepare a demo app that reproduces the issues and share that with us so we can debug it directly,

Regards,
Lance | Tech Support Engineer, Sr.
Progress Telerik
Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Feedback Portal and vote to affect the priority of the items
0
Carl
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Rank 1
answered on 02 Oct 2018, 04:31 PM
capture.png

I was facing the same error mentioned by @Shalin but was not exactly related to the RadEntry control, it was happening in every control. In my case the solution was to place the fonts in the base folder for resources for each platform, that means iOS: /Resources | Android: /Assets.

The problem I'm facing with the RadEntry is I can't see the custom font applied, even the same resource I'm using is correctly applied to a Label, no errors or something saying what is happening.

My XAML

<OnPlatform x:Key="OpenSansRegularFontFamily" x:TypeArguments="x:String">
    <On Platform="Android">OpenSans-Regular.ttf#Open Sans</On>
    <On Platform="iOS">OpenSans-Regular</On>
</OnPlatform>
 
<Style x:Key="HeaderTextStyle" TargetType="{x:Type Label}">
    <Setter Property="FontSize" Value="16" />
    <Setter Property="FontFamily" Value="{StaticResource OpenSansRegularFontFamily}" />
</Style>
 
<Label VerticalOptions="Center" Style="{StaticResource HeaderTextStyle}" Text="{Binding HeaderTitle}" />
 
<Style x:Key="EmailEntryStyle" TargetType="telerikInput:RadEntry">
    <Setter Property="FontSize" Value="14" />
    <Setter Property="FontFamily" Value="{StaticResource OpenSansRegularFontFamily}" />
    <Setter Property="HeightRequest" Value="48" />
    <Setter Property="Margin" Value="0,0,0,16" />
    <Setter Property="BorderStyle">
        <Setter.Value>
            <telerikInput:BorderStyle BorderColor="{StaticResource BlueBorder}" BorderThickness="1" />
        </Setter.Value>
    </Setter>
</Style>
 
<telerikInput:RadEntry Text="{Binding Path=LoginRequest.Email, Mode=TwoWay}" WatermarkText="" Style="{StaticResource EmailEntryStyle}"/>

 

Attached you can see and Image of a View that includes a Label and a RadEntry, the label has the right font and the RadEntry the system default ¿?

I'll appreacite your help

0
Carl
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answered on 02 Oct 2018, 04:31 PM
Any ideas?
0
Carl
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Rank 1
answered on 03 Oct 2018, 02:15 AM

After testing more in depth I found the style resource is not working neither in iOS or Android, the thing is in Android it renders the RadEntry but using the default system font (so it confuses), in iOS it completely crashes the app, if I remove the FontFamily Setter it renders fine but of course without the custom font.

Using the same style in a Xamarin.Forms Entry control the font is applied as expected, seems the quick solution is to remove all RadEntry controls from the app.

Full stacktrace for the record:

2018-10-02 21:12:19.884576-0500 Au.Mobile.iOS[18169:1583709]
Unhandled Exception:
System.ArgumentNullException: Value cannot be null.
Parameter name: descriptor
  at UIKit.UIFont._FromDescriptor (UIKit.UIFontDescriptor descriptor, System.nfloat pointSize) [0x00003] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/UIKit/UIFont.g.cs:105
  at UIKit.UIFont.FromDescriptor (UIKit.UIFontDescriptor descriptor, System.nfloat pointSize) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/UIKit/UIFont.cs:179
  at Telerik.XamarinForms.InputRenderer.iOS.EntryAdapter.UpdateFont (Telerik.XamarinForms.Input.RadEntry sourceOwner, Telerik.XamarinForms.InputRenderer.iOS.BorderUITextField targetOwner) [0x0007a] in <d0a876660776495e813c999dbd32c53a>:0
  at Telerik.XamarinForms.InputRenderer.iOS.EntryAdapter.UpdateCore (Telerik.XamarinForms.Input.RadEntry sourceOwner, Telerik.XamarinForms.InputRenderer.iOS.BorderUITextField targetOwner, Syst
em.String propertyName) [0x0003a] in <d0a876660776495e813c999dbd32c53a>:0
  at Telerik.XamarinForms.Common.FacadeAdapterBase`2[S,T].Update (System.Object sourceOwner, System.Object targetOwner, System.String propertyName, System.Object sourceOwnerRoot, System.Object targetOwnerRoot) [0x00000] in <854ee8369bca461384d3ac3224bfd96a>:0
  at Telerik.XamarinForms.Common.XamarinToNativeControlExtensions.Update[T,K] (T nativeElement, K xf–ïlement, System.String propertyName, System.Object sourceOwnerRoot, System.Object targetOwnerRoot) [0x00031] in <854ee8369bca461384d3ac3224bfd96a>:0
  at Telerik.XamarinForms.InputRenderer.iOS.EntryRenderer.OnElementAttached (Telerik.XamarinForms.Input.RadEntry newElement) [0x00046] in <d0a876660776495e813c999dbd32c53a>:0
  at Telerik.XamarinForms.Common.iOS.IosRendererBase`2[S,T].OnElementChanged (Xamarin.Forms.Platform.iOS.ElementChangedEventArgs`1[TElement] e) [0x00037] in <854ee8369bca461384d3ac3224bfd96a>:0
  at Xamarin.Forms.Platform.iOS.VisualElementRenderer`1[TElement].
SetElement (TElement element) [0x00122] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementRenderer.cs:192
  at Xamarin.Forms.Platform.iOS.VisualElementRenderer`1[TElement].Xamarin.Forms.Platform.iOS.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00000] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementRenderer.cs:141
  at Xamarin.Forms.Platform.iOS.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x00014] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Platform.cs:198
  at Xamarin.Forms.Platform.iOS.VisualElementPackager.OnChildAdded (Xamarin.Forms.VisualElement view) [0x0003d] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementPackager.cs:97
  at Xamarin.Forms.Platform.iOS.VisualElementPackager.Load () [0x0001e] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementPackager.cs:46
  at Xamarin.Forms.Platform.iOS.VisualElementRenderer`1[TElement].SetElement (TElement element) [0x000de] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementRenderer.cs:179
  at Xamarin.For
ms.Platform.iOS.VisualElementRenderer`1[TElement].Xamarin.Forms.Platform.iOS.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00000] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementRenderer.cs:141
  at Xamarin.Forms.Platform.iOS.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x00014] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Platform.cs:198
  at Xamarin.Forms.Platform.iOS.VisualElementPackager.OnChildAdded (Xamarin.Forms.VisualElement view) [0x0003d] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementPackager.cs:97
  at Xamarin.Forms.Platform.iOS.VisualElementPackager.Load () [0x0001e] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementPackager.cs:46
  at Xamarin.Forms.Platform.iOS.VisualElementRenderer`1[TElement].SetElement (TElement element) [0x000de] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementRenderer.cs:179
  at Xamarin.Forms.Platform.iOS.VisualElementRenderer`1[TElement].Xamarin.Forms.Platform.iOS.IVisualElementRenderer.SetElement (Xamarin.Forms
.VisualElement element) [0x00000] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementRenderer.cs:141
  at Xamarin.Forms.Platform.iOS.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x00014] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Platform.cs:198
  at Xamarin.Forms.Platform.iOS.VisualElementPackager.OnChildAdded (Xamarin.Forms.VisualElement view) [0x0003d] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementPackager.cs:97
  at Xamarin.Forms.Platform.iOS.VisualElementPackager.OnChildAdded (System.Object sender, Xamarin.Forms.ElementEventArgs e) [0x0000f] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementPackager.cs:152
  at Xamarin.Forms.Element.OnChildAdded (Xamarin.Forms.Element child) [0x00023] in D:\a\1\s\Xamarin.Forms.Core\Element.cs:344
  at Xamarin.Forms.VisualElement.OnChildAdded (Xamarin.Forms.Element child) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:633
  at Xamarin.Forms.Layout.OnInternalAdded (Xamarin.Forms.View view) [0x0001d] in D:\a\1\s\Xamarin.Forms.Core\Lay
out.cs:450
  at Xamarin.Forms.Layout.InternalChildrenOnCollectionChanged (System.Object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x00089] in D:\a\1\s\Xamarin.Forms.Core\Layout.cs:440
  at System.Collections.ObjectModel.ObservableCollection`1[T].OnCollectionChanged (System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x0000f] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/mcs/class/referencesource/System/compmod/system/collections/objectmodel/observablecollection.cs:288
  at System.Collections.ObjectModel.ObservableCollection`1[T].OnCollectionChanged (System.Collections.Specialized.NotifyCollectionChangedAction action, System.Object item, System.Int32 index) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/mcs/class/referencesource/System/compmod/system/collections/objectmodel/observablecollection.cs:351
  at System.Collections.ObjectModel.ObservableCollection`1[T].InsertItem (System
.Int32 index, T item) [0x00024] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/mcs/class/referencesource/System/compmod/system/collections/objectmodel/observablecollection.cs:219
  at System.Collections.ObjectModel.Collection`1[T].Add (T item) [0x00020] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/collections/objectmodel/collection.cs:67
  at Xamarin.Forms.ContentPresenter+<OnContentChanged>d__10.MoveNext () [0x0004e] in D:\a\1\s\Xamarin.Forms.Core\ContentPresenter.cs:86
--- End of stack trace from previous location where exception was thrown ---
  at System.Runtime.CompilerServices.AsyncMethodBuilderCore+<>c.<ThrowAsync>b__6_0 (System.Object state) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1018
  at Foundation.NSAsyncSynchronizationContextDispatcher.Apply () [0x
00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/Foundation/NSAction.cs:178
  at (wrapper managed-to-native) UIKit.UIApplication.UIApplicationMain(int,string[],intptr,intptr)
  at UIKit.UIApplication.Main (System.String[] args, System.IntPtr principal, System.IntPtr delegate) [0x00005] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/UIKit/UIApplication.cs:79
  at UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x0002c] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/UIKit/UIApplication.cs:63
  at AuditoriasCiudadanas.Mobile.iOS.Application.Main (System.String[] args) [0x00001] in C:\other\AuditoriasCiudadanas.Mobile\src\AuditoriasCiudadanas.Mobile.iOS\Main.cs:12
2018-10-02 21:12:19.888635-0500 AuditoriasCiudadanas.Mobile.iOS[18169:1583709] Unhandled managed exception:
Value cannot be null.
Parameter name: descriptor (System.ArgumentNullExc
eption)
  at UIKit.UIFont._FromDescriptor (UIKit.UIFontDescriptor descriptor, System.nfloat pointSize) [0x00003] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/UIKit/UIFont.g.cs:105
  at UIKit.UIFont.FromDescriptor (UIKit.UIFontDescriptor descriptor, System.nfloat pointSize) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/UIKit/UIFont.cs:179
  at Telerik.XamarinForms.InputRenderer.iOS.EntryAdapter.UpdateFont (Telerik.XamarinForms.Input.RadEntry sourceOwner, Telerik.XamarinForms.InputRenderer.iOS.BorderUITextField targetOwner) [0x0007a] in <d0a876660776495e813c999dbd32c53a>:0
  at Telerik.XamarinForms.InputRenderer.iOS.EntryAdapter.UpdateCore (Telerik.XamarinForms.Input.RadEntry sourceOwner, Telerik.XamarinForms.InputRenderer.iOS.BorderUITextField targetOwner, System.String propertyName) [0x0003a] in <d0a876660776495e813c999dbd32c53a>:0
  at Telerik.XamarinForms.Common.FacadeAdapterBase`2[S,T].Update (System.Object sourceOwner, Syst
em.Object targetOwner, System.String propertyName, System.Object sourceOwnerRoot, System.Object targetOwnerRoot) [0x00000] in <854ee8369bca461384d3ac3224bfd96a>:0
  at Telerik.XamarinForms.Common.XamarinToNativeControlExtensions.Update[T,K] (T nativeElement, K xf–ïlement, System.String propertyName, System.Object sourceOwnerRoot, System.Object targetOwnerRoot) [0x00031] in <854ee8369bca461384d3ac3224bfd96a>:0
  at Telerik.XamarinForms.InputRenderer.iOS.EntryRenderer.OnElementAttached (Telerik.XamarinForms.Input.RadEntry newElement) [0x00046] in <d0a876660776495e813c999dbd32c53a>:0
  at Telerik.XamarinForms.Common.iOS.IosRendererBase`2[S,T].OnElementChanged (Xamarin.Forms.Platform.iOS.ElementChangedEventArgs`1[TElement] e) [0x00037] in <854ee8369bca461384d3ac3224bfd96a>:0
  at Xamarin.Forms.Platform.iOS.VisualElementRenderer`1[TElement].SetElement (TElement element) [0x00122] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementRenderer.cs:192
  at Xamarin.Forms.Platform.iOS.VisualElementRenderer`1[TElemen
t].Xamarin.Forms.Platform.iOS.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00000] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementRenderer.cs:141
  at Xamarin.Forms.Platform.iOS.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x00014] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Platform.cs:198
  at Xamarin.Forms.Platform.iOS.VisualElementPackager.OnChildAdded (Xamarin.Forms.VisualElement view) [0x0003d] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementPackager.cs:97
  at Xamarin.Forms.Platform.iOS.VisualElementPackager.Load () [0x0001e] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementPackager.cs:46
  at Xamarin.Forms.Platform.iOS.VisualElementRenderer`1[TElement].SetElement (TElement element) [0x000de] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementRenderer.cs:179
  at Xamarin.Forms.Platform.iOS.VisualElementRenderer`1[TElement].Xamarin.Forms.Platform.iOS.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00000] in D:\a\1\s\X
amarin.Forms.Platform.iOS\VisualElementRenderer.cs:141
  at Xamarin.Forms.Platform.iOS.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x00014] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Platform.cs:198
  at Xamarin.Forms.Platform.iOS.VisualElementPackager.OnChildAdded (Xamarin.Forms.VisualElement view) [0x0003d] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementPackager.cs:97
  at Xamarin.Forms.Platform.iOS.VisualElementPackager.Load () [0x0001e] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementPackager.cs:46
  at Xamarin.Forms.Platform.iOS.VisualElementRenderer`1[TElement].SetElement (TElement element) [0x000de] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementRenderer.cs:179
  at Xamarin.Forms.Platform.iOS.VisualElementRenderer`1[TElement].Xamarin.Forms.Platform.iOS.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00000] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementRenderer.cs:141
  at Xamarin.Forms.Platform.iOS.Platform.CreateRenderer (Xamarin.Form
s.VisualElement element) [0x00014] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Platform.cs:198
  at Xamarin.Forms.Platform.iOS.VisualElementPackager.OnChildAdded (Xamarin.Forms.VisualElement view) [0x0003d] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementPackager.cs:97
  at Xamarin.Forms.Platform.iOS.VisualElementPackager.OnChildAdded (System.Object sender, Xamarin.Forms.ElementEventArgs e) [0x0000f] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementPackager.cs:152
  at Xamarin.Forms.Element.OnChildAdded (Xamarin.Forms.Element child) [0x00023] in D:\a\1\s\Xamarin.Forms.Core\Element.cs:344
  at Xamarin.Forms.VisualElement.OnChildAdded (Xamarin.Forms.Element child) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:633
  at Xamarin.Forms.Layout.OnInternalAdded (Xamarin.Forms.View view) [0x0001d] in D:\a\1\s\Xamarin.Forms.Core\Layout.cs:450
  at Xamarin.Forms.Layout.InternalChildrenOnCollectionChanged (System.Object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x00089
] in D:\a\1\s\Xamarin.Forms.Core\Layout.cs:440
  at System.Collections.ObjectModel.ObservableCollection`1[T].OnCollectionChanged (System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x0000f] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/mcs/class/referencesource/System/compmod/system/collections/objectmodel/observablecollection.cs:288
  at System.Collections.ObjectModel.ObservableCollection`1[T].OnCollectionChanged (System.Collections.Specialized.NotifyCollectionChangedAction action, System.Object item, System.Int32 index) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/mcs/class/referencesource/System/compmod/system/collections/objectmodel/observablecollection.cs:351
  at System.Collections.ObjectModel.ObservableCollection`1[T].InsertItem (System.Int32 index, T item) [0x00024] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/mcs/class/referencesource/System/compmod/system/collections/
objectmodel/observablecollection.cs:219
  at System.Collections.ObjectModel.Collection`1[T].Add (T item) [0x00020] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/collections/objectmodel/collection.cs:67
  at Xamarin.Forms.ContentPresenter+<OnContentChanged>d__10.MoveNext () [0x0004e] in D:\a\1\s\Xamarin.Forms.Core\ContentPresenter.cs:86
--- End of stack trace from previous location where exception was thrown ---
  at System.Runtime.CompilerServices.AsyncMethodBuilderCore+<>c.<ThrowAsync>b__6_0 (System.Object state) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1018
  at Foundation.NSAsyncSynchronizationContextDispatcher.Apply () [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/Foundation/NSAction.cs:178
  at (wrapper managed-to-native) UIKit.UIApplication.UIAp
plicationMain(int,string[],intptr,intptr)
  at UIKit.UIApplication.Main (System.String[] args, System.IntPtr principal, System.IntPtr delegate) [0x00005] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/UIKit/UIApplication.cs:79
  at UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x0002c] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/UIKit/UIApplication.cs:63
  at AuditoriasCiudadanas.Mobile.iOS.Application.Main (System.String[] args) [0x00001] in C:\other\AuditoriasCiudadanas.Mobile\src\AuditoriasCiudadanas.Mobile.iOS\Main.cs:12
2018-10-02 21:12:19.889425-0500 AuditoriasCiudadanas.Mobile.iOS[18169:1583709] critical: Stacktrace:
2018-10-02 21:12:19.889663-0500 AuditoriasCiudadanas.Mobile.iOS[18169:1583709] critical:
Native stacktrace:
2018-10-02 21:12:19.906332-0500 AuditoriasCiudadanas.Mobile.iOS[18169:1583709] critical:    0   AuditoriasCiudadanas.Mobile.iOS     0x0000000102
3ee564 mono_handle_native_crash + 244
2018-10-02 21:12:19.906567-0500 AuditoriasCiudadanas.Mobile.iOS[18169:1583709] critical:    1   libsystem_platform.dylib            0x0000000108a4cf5a _sigtramp + 26
2018-10-02 21:12:19.906715-0500 AuditoriasCiudadanas.Mobile.iOS[18169:1583709] critical:    2   libsystem_pthread.dylib             0x0000000108a5b570 libsystem_pthread.dylib + 1392
2018-10-02 21:12:19.906876-0500 AuditoriasCiudadanas.Mobile.iOS[18169:1583709] critical:    3   libsystem_c.dylib                   0x00000001087d4c45 abort + 127
2018-10-02 21:12:19.907059-0500 AuditoriasCiudadanas.Mobile.iOS[18169:1583709] critical:    4   AuditoriasCiudadanas.Mobile.iOS     0x000000010260b0df xamarin_unhandled_exception_handler + 47
2018-10-02 21:12:19.907198-0500 AuditoriasCiudadanas.Mobile.iOS[18169:1583709] critical:    5   AuditoriasCiudadanas.Mobile.iOS     0x000000010248bf2e mono_invoke_unhandled_exception_hook + 158
2018-10-02 21:12:19.907336-0500 AuditoriasCiudadanas.Mobile.iOS[18169:1583709] critical:    6   Audit
oriasCiudadanas.Mobile.iOS     0x00000001023edf18 mono_handle_exception_internal + 5976
2018-10-02 21:12:19.907453-0500 AuditoriasCiudadanas.Mobile.iOS[18169:1583709] critical:    7   AuditoriasCiudadanas.Mobile.iOS     0x00000001023ec7b9 mono_handle_exception + 25
2018-10-02 21:12:19.907593-0500 AuditoriasCiudadanas.Mobile.iOS[18169:1583709] critical:    8   AuditoriasCiudadanas.Mobile.iOS     0x000000010236c4d3 mono_amd64_throw_exception + 131
2018-10-02 21:12:19.907704-0500 AuditoriasCiudadanas.Mobile.iOS[18169:1583709] critical:    9   ???                                 0x00000001297d75a7 0x0 + 4991055271
2018-10-02 21:12:19.907835-0500 AuditoriasCiudadanas.Mobile.iOS[18169:1583709] critical:    10  ???                                 0x000000012acfe616 0x0 + 5013235222
2018-10-02 21:12:19.907949-0500 AuditoriasCiudadanas.Mobile.iOS[18169:1583709] critical:    11  AuditoriasCiudadanas.Mobile.iOS     0x0000000102401431 mono_jit_runtime_invoke + 1441
2018-10-02 21:12:19.908053-0500 AuditoriasCiudadanas.Mobile.iOS[18
169:1583709] critical:  12  AuditoriasCiudadanas.Mobile.iOS     0x00000001024f174f mono_runtime_invoke_checked + 127
2018-10-02 21:12:19.908185-0500 AuditoriasCiudadanas.Mobile.iOS[18169:1583709] critical:    13  AuditoriasCiudadanas.Mobile.iOS     0x00000001024f5113 mono_runtime_invoke + 83
2018-10-02 21:12:19.908301-0500 AuditoriasCiudadanas.Mobile.iOS[18169:1583709] critical:    14  AuditoriasCiudadanas.Mobile.iOS     0x00000001026144ca xamarin_invoke_trampoline + 6042
2018-10-02 21:12:19.908406-0500 AuditoriasCiudadanas.Mobile.iOS[18169:1583709] critical:    15  AuditoriasCiudadanas.Mobile.iOS     0x000000010261c47d xamarin_arch_trampoline + 189
2018-10-02 21:12:19.908545-0500 AuditoriasCiudadanas.Mobile.iOS[18169:1583709] critical:    16  AuditoriasCiudadanas.Mobile.iOS     0x000000010261d8b1 xamarin_x86_64_common_trampoline + 110
2018-10-02 21:12:19.908665-0500 AuditoriasCiudadanas.Mobile.iOS[18169:1583709] critical:    17  Foundation                          0x0000000105726e7b __NSThreadPerformPerform + 330
2018
-10-02 21:12:19.908830-0500 AuditoriasCiudadanas.Mobile.iOS[18169:1583709] critical:    18  CoreFoundation                      0x0000000106203b31 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
2018-10-02 21:12:19.908981-0500 AuditoriasCiudadanas.Mobile.iOS[18169:1583709] critical:    19  CoreFoundation                      0x00000001062033a3 __CFRunLoopDoSources0 + 243
2018-10-02 21:12:19.909170-0500 AuditoriasCiudadanas.Mobile.iOS[18169:1583709] critical:    20  CoreFoundation                      0x00000001061fda4f __CFRunLoopRun + 1263
2018-10-02 21:12:19.909342-0500 AuditoriasCiudadanas.Mobile.iOS[18169:1583709] critical:    21  CoreFoundation                      0x00000001061fd221 CFRunLoopRunSpecific + 625
2018-10-02 21:12:19.909465-0500 AuditoriasCiudadanas.Mobile.iOS[18169:1583709] critical:    22  GraphicsServices                    0x0000000111f011dd GSEventRunModal + 62
2018-10-02 21:12:19.909631-0500 AuditoriasCiudadanas.Mobile.iOS[18169:1583709] critical:    23  UIKitCore                 
         0x000000010dafa115 UIApplicationMain + 140
2018-10-02 21:12:19.909833-0500 AuditoriasCiudadanas.Mobile.iOS[18169:1583709] critical:    24  ???                                 0x000000012c8159be 0x0 + 5041641918
2018-10-02 21:12:19.910003-0500 AuditoriasCiudadanas.Mobile.iOS[18169:1583709] critical:    25  ???                                 0x000000012c815753 0x0 + 5041641299
2018-10-02 21:12:19.910210-0500 AuditoriasCiudadanas.Mobile.iOS[18169:1583709] critical:
=================================================================
Got a SIGABRT while executing native code. This usually indicates
a fatal error in the mono runtime or one of the native libraries
used by your application.
=================================================================
0
Lance | Manager Technical Support
Telerik team
answered on 04 Oct 2018, 06:06 PM
Hello Carl,

Do you see the same problem if you directly set the FontFamily on the control (and not in shared Style resource)?

Regards,
Lance | Tech Support Engineer, Sr.
Progress Telerik
Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Feedback Portal and vote to affect the priority of the items
0
Carl
Top achievements
Rank 1
answered on 04 Oct 2018, 10:11 PM

Hello Lance,

I did the test you asked me setting the FontName directly in the XAML definition of the RadEntry and the result is: The control gets rendered in both platforms (without crashing) but the custom font is only shown in iOS, in Android te control used the default system font.

<OnPlatform x:Key="OpenSansRegularFontFamily" x:TypeArguments="x:String">
    <On Platform="Android">OpenSans-Regular.ttf#Open Sans</On>
    <On Platform="iOS">OpenSans-Regular</On>
</OnPlatform>
 
<Style x:Key="EmailEntryStylee" TargetType="Entry">
    <Setter Property="TextColor" Value="{StaticResource BlueTextColor}" />
    <Setter Property="PlaceholderColor" Value="{StaticResource BlueTextColor}" />
    <Setter Property="FontSize" Value="14" />
    <!--<Setter Property="FontFamily" Value="{StaticResource OpenSansRegularFontFamily}" />-->
    <Setter Property="HeightRequest" Value="48" />
    <Setter Property="Margin" Value="0,0,0,16" />
</Style>
 
<telerikInput:RadEntry Text="{Binding Path=LoginRequest.Email, Mode=TwoWay}"
                        WatermarkText="{ex:Translate Key=AppLogin_EntryEmail}"
                        FontFamily="Open Sans"
                        Style="{StaticResource EmailEntryStyle}"/>

 

Another important thing to mention is the name of the Font for iOS in my shared style resource, you can see it's set to "OpenSans-Regular" with that name it's rendered perfectly in a normal Entry control, but if I use that name in the RadEntry it throws the same exception, It needs to be set to "Open Sans", why? No idea how the RadEntry is getting the font names from the system/platform it's weird the Entry control uses a font name and the RadEntry uses another.

Look forward to hearing how to handle this problem

 

 

0
Lance | Manager Technical Support
Telerik team
answered on 08 Oct 2018, 04:07 PM
CustomFont.zip
Hello Carl,

Thank you for the additional details, I have been able to reproduce the following results in my tests. You can follow along these in the attached reproducible inf you're interested.

Android
When assigning FontFamily in XAML, or dynamically, the custom font isn't used and falls back to default font. I could not determine a workaround.

iOS
When setting the font in XAML, you get an unhandled exception: System.ArgumentNullException: Value cannot be null. Parameter name: descriptor

Workaround:
Set the font after the page loads, for example:

protected override void OnAppearing()
{
    base.OnAppearing();
 
    var font = "";
 
    switch (Device.RuntimePlatform)
    {
        case "Android":
            font = "IndieFlower.ttf#Indie Flower";
            break;
        case "iOS":
            font = "Indie Flower";
            break;
        case "UWP":
            font = "Assets/Fonts/IndieFlower.ttf#Indie Flower";
            break;
    }
 
    MyRadEntry.FontFamily = font;
    MyRadEntry.Text = font;
 
    MyEntry.FontFamily = font;
    MyEntry.Text = font;
}




UWP
Works as expected when defined in XAML or dynamically.


I've logged the bug report for the development team to investigate further, please take a moment to up-vote and follow the item so that you'll be notified of status changes: RadEntry: Custom Font not applied.

Regards,
Lance | Tech Support Engineer, Sr.
Progress Telerik
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0
Carl
Top achievements
Rank 1
answered on 11 Oct 2018, 08:51 AM
screen-shot-2018-10-11-at-1-16-36-am.png

Hello Lance,

With your suggestions I'm able to get the custom font showing on iOS

But as you mentioned, unfortunately there is no easy way to get this working on Android.

Screenshot attached.

0
Steve
Top achievements
Rank 1
answered on 21 May 2019, 03:36 PM

Hello. I am having same error.  I had DataGrid working perfectly and now this error came along.

I am not even using custom Fonts. 

Here's my grid xaml. 

      <telerikGrid:RadDataGrid x:Name="grid" 
             ItemsSource="{Binding .}" 
             AutoGenerateColumns="False"
             UserEditMode="None">
        <telerikGrid:RadDataGrid.RowBackgroundStyle>
            <telerikGrid:DataGridBorderStyle BackgroundColor="#EFEFEF" BorderColor="#84898F" BorderThickness="1"/>
        </telerikGrid:RadDataGrid.RowBackgroundStyle>
        <telerikGrid:RadDataGrid.AlternateRowBackgroundStyle >
            <telerikGrid:DataGridBorderStyle BackgroundColor="White" BorderColor="#84898F" BorderThickness="1"/>
        </telerikGrid:RadDataGrid.AlternateRowBackgroundStyle>
        <telerikGrid:RadDataGrid.Columns>
            <telerikGrid:DataGridTextColumn PropertyName="Name" CanUserEdit="false" HeaderText="Name" Width="100" SizeMode="Auto">
                <telerikGrid:DataGridTextColumn.CellContentStyle>
                    <telerikGrid:DataGridTextCellStyle TextColor="#84898F" FontSize="15" HorizontalTextAlignment="Start" VerticalTextAlignment="Start" SelectedTextColor="Orange"  />
                </telerikGrid:DataGridTextColumn.CellContentStyle>
            </telerikGrid:DataGridTextColumn>
            <telerikGrid:DataGridDateColumn PropertyName="DisplayDate" CanUserEdit="false" HeaderText="Date">
                <telerikGrid:DataGridTextColumn.CellContentStyle>
                    <telerikGrid:DataGridTextCellStyle TextColor="#84898F" FontSize="15" HorizontalTextAlignment="Start" VerticalTextAlignment="Start" SelectedTextColor="Orange"  />
                </telerikGrid:DataGridTextColumn.CellContentStyle>
            </telerikGrid:DataGridDateColumn>  
            <telerikGrid:DataGridTextColumn PropertyName="Location" CanUserEdit="false" HeaderText="Location">
                <telerikGrid:DataGridTextColumn.CellContentStyle>
                    <telerikGrid:DataGridTextCellStyle TextColor="#84898F" FontSize="15" HorizontalTextAlignment="Start" VerticalTextAlignment="Start" SelectedTextColor="Orange"  />
                </telerikGrid:DataGridTextColumn.CellContentStyle>
            </telerikGrid:DataGridTextColumn>
            <telerikGrid:DataGridNumericalColumn PropertyName="PayRate" CanUserEdit="false" HeaderText="Pay Rate">
                    <telerikGrid:DataGridTextColumn.CellContentStyle>
                    <telerikGrid:DataGridTextCellStyle TextColor="#84898F" FontSize="15" HorizontalTextAlignment="Center" VerticalTextAlignment="Start" SelectedTextColor="Orange"  />
                </telerikGrid:DataGridTextColumn.CellContentStyle>
            </telerikGrid:DataGridNumericalColumn>
            <telerikGrid:DataGridTextColumn PropertyName="PayType" CanUserEdit="false" HeaderText="Pay Type">
                <telerikGrid:DataGridTextColumn.CellContentStyle>
                    <telerikGrid:DataGridTextCellStyle TextColor="#84898F" FontSize="15" HorizontalTextAlignment="Start" VerticalTextAlignment="Start" SelectedTextColor="Orange"  />
                </telerikGrid:DataGridTextColumn.CellContentStyle>
            </telerikGrid:DataGridTextColumn>
            <telerikGrid:DataGridTemplateColumn HeaderText="" CanUserFilter="false" CanUserSort="false" CanUserGroup="false">
                <telerikGrid:DataGridTemplateColumn.CellContentTemplate>
                    <DataTemplate>
                        <StackLayout InputTransparent="True" Orientation="Horizontal">
                            <Button Text="View" ClassId="{Binding WorkOrderId}"></Button>
                            <Button Text="Check In" ClassId="{Binding WorkOrderId}"></Button>
                        </StackLayout>
                    </DataTemplate>
                </telerikGrid:DataGridTemplateColumn.CellContentTemplate>
            </telerikGrid:DataGridTemplateColumn>
        </telerikGrid:RadDataGrid.Columns>
    </telerikGrid:RadDataGrid>

 

 

Here's the error:

 

  at UIKit.UILabel.set_Font (UIKit.UIFont value) [0x0000e] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.8.0.2/src/Xamarin.iOS/UIKit/UILabel.g.cs:374 
  at Telerik.XamarinForms.Common.iOSTextPaintable.EnsureFont () [0x00047] in <82f282ae47ad41adb5d69625c03d537b>:0 
  at Telerik.XamarinForms.Common.iOSTextPainter.Measure (Telerik.XamarinForms.Common.Paintables.MeasureablePaintable paintable, Telerik.XamarinForms.Common.Painters.PurePainterContext context) [0x00022] in <82f282ae47ad41adb5d69625c03d537b>:0 
  at Telerik.XamarinForms.Common.Painters.PurePainter.Measure (Telerik.XamarinForms.Common.Paintables.MeasureablePaintable paintable) [0x00026] in <82f282ae47ad41adb5d69625c03d537b>:0 
  at Telerik.XamarinForms.DataGrid.MasterArranger.MeasureNodeContainer (System.Object container, System.Double widthConstraint) [0x00014] in <6a37ae25f9114cee80a6c643ad913c24>:0 
  at Telerik.XamarinForms.DataGrid.MasterArranger.MeasureVisualizable (Telerik.XamarinForms.DataGrid.Visualizable visualizable, Telerik.XamarinForms.Common.Primitives.RadSize availableSize) [0x00075] in <6a37ae25f9114cee80a6c643ad913c24>:0 
  at (wrapper delegate-invoke) System.Func`3[Telerik.XamarinForms.DataGrid.Visualizable,Telerik.XamarinForms.Common.Primitives.RadSize,Telerik.XamarinForms.Common.Primitives.RadSize].invoke_TResult_T1_T2(Telerik.XamarinForms.DataGrid.Visualizable,Telerik.XamarinForms.Common.Primitives.RadSize)
  at Telerik.XamarinForms.DataGrid.CompositeVisualizable.MeasureVisualizable (Telerik.XamarinForms.DataGrid.Visualizable visualizable, Telerik.XamarinForms.Common.Primitives.RadSize availableSize) [0x00000] in <6a37ae25f9114cee80a6c643ad913c24>:0 
  at (wrapper delegate-invoke) System.Func`3[Telerik.XamarinForms.DataGrid.Visualizable,Telerik.XamarinForms.Common.Primitives.RadSize,Telerik.XamarinForms.Common.Primitives.RadSize].invoke_TResult_T1_T2(Telerik.XamarinForms.DataGrid.Visualizable,Telerik.XamarinForms.Common.Primitives.RadSize)
  at Telerik.XamarinForms.DataGrid.Visualizable.MeasureWithInfinity () [0x00000] in <6a37ae25f9114cee80a6c643ad913c24>:0 
  at Telerik.XamarinForms.Common.LayoutControl.HorizontalLayoutControlPanelStrategy.Measure (System.Collections.Generic.IEnumerable`1[T] children, Telerik.XamarinForms.Common.Primitives.RadSize availableSize) [0x00085] in <82f282ae47ad41adb5d69625c03d537b>:0 
  at Telerik.XamarinForms.DataGrid.HorizontalLayoutControlVisualizableStrategy.Measure (Telerik.XamarinForms.Common.ObservableItemCollection`1[T] children, Telerik.XamarinForms.Common.Primitives.RadSize availableSize) [0x00000] in <6a37ae25f9114cee80a6c643ad913c24>:0 
  at Telerik.XamarinForms.DataGrid.CompositeVisualizable.Measure (System.Double widthConstraint, System.Func`3[T1,T2,TResult] measureVisualizableFunc) [0x00022] in <6a37ae25f9114cee80a6c643ad913c24>:0 
  at Telerik.XamarinForms.DataGrid.MasterArranger.MeasureVisualizable (Telerik.XamarinForms.DataGrid.Visualizable visualizable, Telerik.XamarinForms.Common.Primitives.RadSize availableSize) [0x00018] in <6a37ae25f9114cee80a6c643ad913c24>:0 
  at (wrapper delegate-invoke) System.Func`3[Telerik.XamarinForms.DataGrid.Visualizable,Telerik.XamarinForms.Common.Primitives.RadSize,Telerik.XamarinForms.Common.Primitives.RadSize].invoke_TResult_T1_T2(Telerik.XamarinForms.DataGrid.Visualizable,Telerik.XamarinForms.Common.Primitives.RadSize)
  at Telerik.XamarinForms.DataGrid.CompositeVisualizable.MeasureVisualizable (Telerik.XamarinForms.DataGrid.Visualizable visualizable, Telerik.XamarinForms.Common.Primitives.RadSize availableSize) [0x00000] in <6a37ae25f9114cee80a6c643ad913c24>:0 
  at (wrapper delegate-invoke) System.Func`3[Telerik.XamarinForms.DataGrid.Visualizable,Telerik.XamarinForms.Common.Primitives.RadSize,Telerik.XamarinForms.Common.Primitives.RadSize].invoke_TResult_T1_T2(Telerik.XamarinForms.DataGrid.Visualizable,Telerik.XamarinForms.Common.Primitives.RadSize)
  at Telerik.XamarinForms.DataGrid.Visualizable.MeasureWithInfinity () [0x00000] in <6a37ae25f9114cee80a6c643ad913c24>:0 
  at Telerik.XamarinForms.DataGrid.GridVisualizableStrategy.Measure (Telerik.XamarinForms.Common.ObservableItemCollection`1[T] children, Telerik.XamarinForms.Common.Primitives.RadSize availableSize) [0x00029] in <6a37ae25f9114cee80a6c643ad913c24>:0 
  at Telerik.XamarinForms.DataGrid.CompositeVisualizable.Measure (System.Double widthConstraint, System.Func`3[T1,T2,TResult] measureVisualizableFunc) [0x00022] in <6a37ae25f9114cee80a6c643ad913c24>:0 
  at Telerik.XamarinForms.DataGrid.MasterArranger.MeasureVisualizable (Telerik.XamarinForms.DataGrid.Visualizable visualizable, Telerik.XamarinForms.Common.Primitives.RadSize availableSize) [0x00018] in <6a37ae25f9114cee80a6c643ad913c24>:0 
  at Telerik.XamarinForms.DataGrid.MasterArranger.MeasureNodeContainer (System.Object container, System.Double widthConstraint) [0x0007c] in <6a37ae25f9114cee80a6c643ad913c24>:0 
  at Telerik.XamarinForms.DataGrid.MasterArranger.MeasureGridCellModel (Telerik.XamarinForms.DataGrid.GridCellModel model) [0x00026] in <6a37ae25f9114cee80a6c643ad913c24>:0 
  at Telerik.XamarinForms.DataGrid.MasterArranger.MeasureNode (Telerik.XamarinForms.Common.Node model) [0x0000a] in <6a37ae25f9114cee80a6c643ad913c24>:0 
  at Telerik.XamarinForms.DataGrid.DataGridColumn.Telerik.XamarinForms.DataGrid.IDataGridColumnDefinition.GetColumnHeaderSize (Telerik.XamarinForms.DataGrid.GridHeaderCellModel model) [0x00000] in <6a37ae25f9114cee80a6c643ad913c24>:0 
  at Telerik.XamarinForms.DataGrid.ColumnModelGenerator.GetSize (Telerik.XamarinForms.DataGrid.GridHeaderCellModel decorator) [0x00000] in <6a37ae25f9114cee80a6c643ad913c24>:0 
  at Telerik.XamarinForms.DataGrid.NodePool`2[T,K].GetSize (T decorator) [0x0001e] in <6a37ae25f9114cee80a6c643ad913c24>:0 
  at Telerik.XamarinForms.DataGrid.NodePool`2[T,K].GetGenerateAndDesiredThickness (System.Collections.Generic.List`1[T] models) [0x00025] in <6a37ae25f9114cee80a6c643ad913c24>:0 
  at Telerik.XamarinForms.DataGrid.NodePool`2[T,K].GenerateModelsForInfos (System.Collections.Generic.IList`1[T] itemInfos, Telerik.XamarinForms.DataGrid.NodePool`2+ModelGenerationContext[T,K] modelGenerationContext) [0x00086] in <6a37ae25f9114cee80a6c643ad913c24>:0 
  at Telerik.XamarinForms.DataGrid.NodePool`2[T,K].MeasureForward (Telerik.XamarinForms.DataGrid.NodePool`2+MeasureContext[T,K]& context) [0x00047] in <6a37ae25f9114cee80a6c643ad913c24>:0 
  at Telerik.XamarinForms.DataGrid.NodePool`2[T,K].MeasureHorizontally (Telerik.XamarinForms.Common.Primitives.RadSize availableSize, System.Double offset) [0x00027] in <6a37ae25f9114cee80a6c643ad913c24>:0 
  at Telerik.XamarinForms.DataGrid.NodePool`2[T,K].OnMeasure (Telerik.XamarinForms.Common.Primitives.RadSize availableSize, System.Double offset, System.Double verticalBuffer) [0x00036] in <6a37ae25f9114cee80a6c643ad913c24>:0 
  at Telerik.XamarinForms.DataGrid.GridModel.MeasureHeaderRow (Telerik.XamarinForms.Common.Primitives.RadSize newAvailableSize) [0x0000d] in <6a37ae25f9114cee80a6c643ad913c24>:0 
  at Telerik.XamarinForms.DataGrid.GridModel.MeasureGridInternal (Telerik.XamarinForms.Common.Primitives.RadSize availableSize) [0x00049] in <6a37ae25f9114cee80a6c643ad913c24>:0 
  at Telerik.XamarinForms.DataGrid.GridModel.MeasureGrid (Telerik.XamarinForms.Common.Primitives.RadSize availableSize) [0x00007] in <6a37ae25f9114cee80a6c643ad913c24>:0 
  at Telerik.XamarinForms.DataGrid.GridModel.ArrangeGridInternal (Telerik.XamarinForms.Common.Primitives.RadSize availableSize) [0x00000] in <6a37ae25f9114cee80a6c643ad913c24>:0 
  at Telerik.XamarinForms.DataGrid.GridModel.ArrangeGrid (Telerik.XamarinForms.Common.Primitives.RadSize availableSize) [0x00000] in <6a37ae25f9114cee80a6c643ad913c24>:0 
  at Telerik.XamarinForms.DataGrid.RadDataGrid.UpdateUI (System.Double x, System.Double y, System.Double width, System.Double height) [0x00019] in <6a37ae25f9114cee80a6c643ad913c24>:0 
  at Telerik.XamarinForms.DataGrid.RadDataGrid.OnLayoutChildrenOverride (System.Double x, System.Double y, System.Double width, System.Double height) [0x00000] in <6a37ae25f9114cee80a6c643ad913c24>:0 
  at Telerik.XamarinForms.Common.RadLayout`1[T].LayoutChildren (System.Double x, System.Double y, System.Double width, System.Double height) [0x00007] in <82f282ae47ad41adb5d69625c03d537b>:0 
  at Xamarin.Forms.Layout.UpdateChildrenLayout () [0x0014b] in D:\a\1\s\Xamarin.Forms.Core\Layout.cs:264 
  at Xamarin.Forms.Layout.OnSizeAllocated (System.Double width, System.Double height) [0x0000f] in D:\a\1\s\Xamarin.Forms.Core\Layout.cs:224 
  at Xamarin.Forms.VisualElement.SizeAllocated (System.Double width, System.Double height) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:804 
  at Xamarin.Forms.VisualElement.SetSize (System.Double width, System.Double height) [0x00021] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:1043 
  at Xamarin.Forms.VisualElement.set_Bounds (Xamarin.Forms.Rectangle value) [0x0005d] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:307 
  at Xamarin.Forms.VisualElement.Layout (Xamarin.Forms.Rectangle bounds) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:706 
  at Xamarin.Forms.Layout.LayoutChildIntoBoundingRegion (Xamarin.Forms.VisualElement child, Xamarin.Forms.Rectangle region) [0x001da] in D:\a\1\s\Xamarin.Forms.Core\Layout.cs:178 
  at Xamarin.Forms.Page.LayoutChildren (System.Double x, System.Double y, System.Double width, System.Double height) [0x0010d] in D:\a\1\s\Xamarin.Forms.Core\Page.cs:189 
  at Xamarin.Forms.Page.UpdateChildrenLayout () [0x000c9] in D:\a\1\s\Xamarin.Forms.Core\Page.cs:265 
  at Xamarin.Forms.Page.OnSizeAllocated (System.Double width, System.Double height) [0x0000f] in D:\a\1\s\Xamarin.Forms.Core\Page.cs:245 
  at Xamarin.Forms.VisualElement.SizeAllocated (System.Double width, System.Double height) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:804 
  at Xamarin.Forms.VisualElement.SetSize (System.Double width, System.Double height) [0x00021] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:1043 
  at Xamarin.Forms.VisualElement.set_Bounds (Xamarin.Forms.Rectangle value) [0x0005d] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:307 
  at Xamarin.Forms.VisualElement.Layout (Xamarin.Forms.Rectangle bounds) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:706 
  at Xamarin.Forms.Layout.LayoutChildIntoBoundingRegion (Xamarin.Forms.VisualElement child, Xamarin.Forms.Rectangle region) [0x0005f] in D:\a\1\s\Xamarin.Forms.Core\Layout.cs:147 
  at Xamarin.Forms.Page.LayoutChildren (System.Double x, System.Double y, System.Double width, System.Double height) [0x0010d] in D:\a\1\s\Xamarin.Forms.Core\Page.cs:189 
  at Xamarin.Forms.Page.UpdateChildrenLayout () [0x000c9] in D:\a\1\s\Xamarin.Forms.Core\Page.cs:265 
  at Xamarin.Forms.Page.OnSizeAllocated (System.Double width, System.Double height) [0x0000f] in D:\a\1\s\Xamarin.Forms.Core\Page.cs:245 
  at Xamarin.Forms.VisualElement.SizeAllocated (System.Double width, System.Double height) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:804 
  at Xamarin.Forms.VisualElement.SetSize (System.Double width, System.Double height) [0x00021] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:1043 
  at Xamarin.Forms.VisualElement.set_Bounds (Xamarin.Forms.Rectangle value) [0x0005d] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:307 
  at Xamarin.Forms.VisualElement.Layout (Xamarin.Forms.Rectangle bounds) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:706 
  at Xamarin.Forms.Layout.LayoutChildIntoBoundingRegion (Xamarin.Forms.VisualElement child, Xamarin.Forms.Rectangle region) [0x0005f] in D:\a\1\s\Xamarin.Forms.Core\Layout.cs:147 
  at Xamarin.Forms.Page.LayoutChildren (System.Double x, System.Double y, System.Double width, System.Double height) [0x0010d] in D:\a\1\s\Xamarin.Forms.Core\Page.cs:189 
  at Xamarin.Forms.Page.UpdateChildrenLayout () [0x000c9] in D:\a\1\s\Xamarin.Forms.Core\Page.cs:265 
  at Xamarin.Forms.Page.OnSizeAllocated (System.Double width, System.Double height) [0x0000f] in D:\a\1\s\Xamarin.Forms.Core\Page.cs:245 
  at Xamarin.Forms.VisualElement.SizeAllocated (System.Double width, System.Double height) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:804 
  at Xamarin.Forms.VisualElement.SetSize (System.Double width, System.Double height) [0x00021] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:1043 
  at Xamarin.Forms.VisualElement.set_Bounds (Xamarin.Forms.Rectangle value) [0x0005d] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:307 
  at Xamarin.Forms.VisualElement.Layout (Xamarin.Forms.Rectangle bounds) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:706 
  at Xamarin.Forms.Layout.LayoutChildIntoBoundingRegion (Xamarin.Forms.VisualElement child, Xamarin.Forms.Rectangle region) [0x0005f] in D:\a\1\s\Xamarin.Forms.Core\Layout.cs:147 
  at Xamarin.Forms.Page.LayoutChildren (System.Double x, System.Double y, System.Double width, System.Double height) [0x0010d] in D:\a\1\s\Xamarin.Forms.Core\Page.cs:189 
  at Xamarin.Forms.Page.UpdateChildrenLayout () [0x000c9] in D:\a\1\s\Xamarin.Forms.Core\Page.cs:265 
  at Xamarin.Forms.Page.OnSizeAllocated (System.Double width, System.Double height) [0x0000f] in D:\a\1\s\Xamarin.Forms.Core\Page.cs:245 
  at Xamarin.Forms.VisualElement.SizeAllocated (System.Double width, System.Double height) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:804 
  at Xamarin.Forms.VisualElement.SetSize (System.Double width, System.Double height) [0x00021] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:1043 
  at Xamarin.Forms.VisualElement.set_Bounds (Xamarin.Forms.Rectangle value) [0x0005d] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:307 
  at Xamarin.Forms.VisualElement.Layout (Xamarin.Forms.Rectangle bounds) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:706 
  at Xamarin.Forms.MasterDetailPage.LayoutChildren (System.Double x, System.Double y, System.Double width, System.Double height) [0x0002c] in D:\a\1\s\Xamarin.Forms.Core\MasterDetailPage.cs:161 
  at Xamarin.Forms.Page.UpdateChildrenLayout () [0x000c9] in D:\a\1\s\Xamarin.Forms.Core\Page.cs:265 
  at Xamarin.Forms.Page.OnSizeAllocated (System.Double width, System.Double height) [0x0000f] in D:\a\1\s\Xamarin.Forms.Core\Page.cs:245 
  at Xamarin.Forms.VisualElement.SizeAllocated (System.Double width, System.Double height) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:804 
  at Xamarin.Forms.Page.OnChildMeasureInvalidated (Xamarin.Forms.VisualElement child, Xamarin.Forms.Internals.InvalidationTrigger trigger) [0x000a9] in D:\a\1\s\Xamarin.Forms.Core\Page.cs:304 
  at Xamarin.Forms.Page.OnChildMeasureInvalidated (System.Object sender, System.EventArgs e) [0x00013] in D:\a\1\s\Xamarin.Forms.Core\Page.cs:227 
  at Xamarin.Forms.VisualElement.InvalidateMeasureInternal (Xamarin.Forms.Internals.InvalidationTrigger trigger) [0x0000b] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:836 
  at Xamarin.Forms.VisualElement.set_IsPlatformEnabled (System.Boolean value) [0x0001c] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:559 
  at Xamarin.Forms.Platform.iOS.Platform+<>c.<.cctor>b__51_0 (Xamarin.Forms.BindableObject bindable, System.Object oldvalue, System.Object newvalue) [0x0000a] in <7402bf39df944a9ebf61606e5f9c45a4>:0 
  at Xamarin.Forms.BindableObject.SetValueActual (Xamarin.Forms.BindableProperty property, Xamarin.Forms.BindableObject+BindablePropertyContext context, System.Object value, System.Boolean currentlyApplying, Xamarin.Forms.Internals.SetValueFlags attributes, System.Boolean silent) [0x00120] in D:\a\1\s\Xamarin.Forms.Core\BindableObject.cs:624 
  at Xamarin.Forms.BindableObject.SetValueCore (Xamarin.Forms.BindableProperty property, System.Object value, Xamarin.Forms.Internals.SetValueFlags attributes, Xamarin.Forms.BindableObject+SetValuePrivateFlags privateAttributes) [0x00179] in D:\a\1\s\Xamarin.Forms.Core\BindableObject.cs:422 
  at Xamarin.Forms.BindableObject.SetValue (Xamarin.Forms.BindableProperty property, System.Object value, System.Boolean fromStyle, System.Boolean checkAccess) [0x0003d] in D:\a\1\s\Xamarin.Forms.Core\BindableObject.cs:572 
  at Xamarin.Forms.BindableObject.SetValue (Xamarin.Forms.BindableProperty property, System.Object value) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\BindableObject.cs:122 
  at Xamarin.Forms.Platform.iOS.Platform.SetRenderer (Xamarin.Forms.VisualElement bindable, Xamarin.Forms.Platform.iOS.IVisualElementRenderer value) [0x00000] in <7402bf39df944a9ebf61606e5f9c45a4>:0 
  at Xamarin.Forms.Platform.iOS.PhoneMasterDetailRenderer.UpdateMasterDetailContainers () [0x000a4] in <7402bf39df944a9ebf61606e5f9c45a4>:0 
  at Xamarin.Forms.Platform.iOS.PhoneMasterDetailRenderer.HandlePropertyChanged (System.Object sender, System.ComponentModel.PropertyChangedEventArgs e) [0x00024] in <7402bf39df944a9ebf61606e5f9c45a4>:0 
  at (wrapper delegate-invoke) <Module>.invoke_void_object_PropertyChangedEventArgs(object,System.ComponentModel.PropertyChangedEventArgs)
  at Xamarin.Forms.BindableObject.OnPropertyChanged (System.String propertyName) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\BindableObject.cs:173 
  at Xamarin.Forms.Element.OnPropertyChanged (System.String propertyName) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\Element.cs:339 
  at Xamarin.Forms.MasterDetailPage.set_Detail (Xamarin.Forms.Page value) [0x00075] in D:\a\1\s\Xamarin.Forms.Core\MasterDetailPage.cs:47 
  at SmartTime.Views.MainPage.NavigateFromMenu (System.Int32 id) [0x0017b] in /Users/bhavinshah/_appDev/ProjectLocker/SmartSource/svn/Branch/P_353-230-756_SSRC_BS/SmartSource.Mobile/SmartTime/SmartTime/Views/MainPage.xaml.cs:63 
  at SmartTime.Views.Menu.<.ctor>b__3_0 (System.Object sender, Xamarin.Forms.SelectedItemChangedEventArgs e) [0x0005d] in /Users/bhavinshah/_appDev/ProjectLocker/SmartSource/svn/Branch/P_353-230-756_SSRC_BS/SmartSource.Mobile/SmartTime/SmartTime/Views/Menu.xaml.cs:38 
  at System.Runtime.CompilerServices.AsyncMethodBuilderCore+<>c.<ThrowAsync>b__6_0 (System.Object state) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.8.0.2/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1023 
  at Foundation.NSAsyncSynchronizationContextDispatcher.Apply () [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.8.0.2/src/Xamarin.iOS/Foundation/NSAction.cs:178 
--- End of stack trace from previous location where exception was thrown ---

  at (wrapper managed-to-native) UIKit.UIApplication.UIApplicationMain(int,string[],intptr,intptr)
  at UIKit.UIApplication.Main (System.String[] args, System.IntPtr principal, System.IntPtr delegate) [0x00005] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.8.0.2/src/Xamarin.iOS/UIKit/UIApplication.cs:79 
  at UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x0002c] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.8.0.2/src/Xamarin.iOS/UIKit/UIApplication.cs:63 
  at SmartTime.iOS.Application.Main (System.String[] args) [0x00002] in /Users/bhavinshah/_appDev/ProjectLocker/SmartSource/svn/Branch/P_353-230-756_SSRC_BS/SmartSource.Mobile/SmartTime/SmartTime.iOS/Main.cs:17 

 

 

 

0
Didi
Telerik team
answered on 22 May 2019, 01:26 PM
Hi Bhavin,

We are aware of this issue and we have it logged in our Feedback portal. You can follow the item at the link below:

https://feedback.telerik.com/xamarin/1410116-datagrid-ios-a-nullreferenceexception-is-thrown-when-trying-to-load-the-telerik-font

Workaround:

You could use the following workaround: Access anything from the TelerikFont class before the InitializeComponent of the page, for example:

public MainPage()
{
  TelerikFont.GetUseEmbeddedFont(this);
  
  InitializeComponent();

I hope I was helpful.

Regards,
Didi
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