Telerik Forums
UI for Xamarin Forum
1 answer
86 views
on iOS with swipe enabled, SwipeOffset="0,0,70,0", selectionMode multiple.
when swiped to the left the checkbox hovers over the item when it comes back to original position.  Tried adjusting the threshold, offset, and called EndItemSwipe() on ItemSwipeCompleted.  but can't get the item to go back to default position. 
Lance | Senior Manager Technical Support
Telerik team
 answered on 22 Mar 2018
1 answer
383 views
in ios, is there way to bind command to checkbox?  I want to select item when checkbox is tapped when SelectionGesture is hold.
Lance | Senior Manager Technical Support
Telerik team
 answered on 22 Mar 2018
2 answers
357 views

When the RadListView is empty (no items) it shows the text "No data" in the top left corner.

How can I customize (change text, position, style or hide) that text?

Stefan Nenchev
Telerik team
 answered on 22 Mar 2018
3 answers
58 views

I am looking to purchase this control to achieve a task in our xamarin project. Not sure this control has all features that we are expecting.

1 - Custom UI for Text Field, result display cells or list.

2 - Re-populating list from data provided after search.

3 - Callbacks on each character type to make web service calls.

4 - Controlling Text Field focus intentionally.

Can anyone confirm?

Yana
Telerik team
 answered on 22 Mar 2018
1 answer
97 views
I am wondering if it is possible to use a custom transition between views? I don't see anything in the documentation indicating that you can, so I am assuming no, but I want to make sure.
Stefan Nenchev
Telerik team
 answered on 21 Mar 2018
1 answer
152 views

Everything is in the title, the side drawer add a blur background on the DrawerContent is it possible to remove it ?

Thanks.

Stefan Nenchev
Telerik team
 answered on 21 Mar 2018
7 answers
329 views

I receive the following error when I use a Side Drawer inside a tab view.

When you initially navigate to the tab everything works fine. if you navigate away and come back to the tab the following error arises

Java.Lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.

 

Is this a known issue?

Lance | Senior Manager Technical Support
Telerik team
 answered on 20 Mar 2018
3 answers
162 views

I recently noticed that binding is not reevaluated on iOS, when using an ItemTemplateSelector along with a RadListView (latest Telerik nugets as of today), on VM property that is bound with a converter.

Here is the RadListView definition:

<dataControls:RadListView ItemsSource="{Binding MyObservableCollection}"
                                          ItemTemplateSelector="{StaticResource MyTemplateSelector}"
                                          SelectionMode="None">

 

Here MyTemplateSelector:

<DataTemplate x:Key="DefaultTemplate">
                <listView:ListViewTemplateCell>
                    <listView:ListViewTemplateCell.View>
                        <views:MyCellView />
                    </listView:ListViewTemplateCell.View>
                </listView:ListViewTemplateCell>
            </DataTemplate>
 
            <DataTemplate x:Key="EmptyTemplate">
                <listView:ListViewTemplateCell>
                    <listView:ListViewTemplateCell.View>
                        <Grid HeightRequest="60" />
                    </listView:ListViewTemplateCell.View>
                </listView:ListViewTemplateCell>
            </DataTemplate>
 
            <selectors:MyTemplateSelector x:Key="MyTemplateSelector"
                                                                DefaultTemplate="{StaticResource DefaultTemplate}"
                                                                EmptyTemplate="{StaticResource EmptyTemplate}" />

Here is the binding definition in  "DefaultTemplate":

<Label Grid.Row="3" Grid.Column="1"
            Text="{Binding MyStringProperty, Converter={StaticResource MyStringToStringConverter}}"
            Style="{StaticResource MyTextStyle}" />

 

To reproduce, I simply call RaisePropertyChange(nameof(MyStringProperty)) in VMs displayed in the RadListView, and the view does not get updated.

This is perfectly working on Android, and on both Android and iOS when not using any ItemTemplateSelector.

 

NB : this is not linked to this issue.

Yana
Telerik team
 answered on 20 Mar 2018
2 answers
211 views
Hi all,
It's a popular topic how in Xamarin Forms we need to avoid listview in a scroll view. It's often required to stack something above a listview and scroll all together. Xamarin's solution for this is to come up with the Header and Footer template so that you don't have to place your ListView within a scrollview.
I don't think there's HeaderTeamplate in Telerik Xamarin Forms Listview nor I couldn't figure out a workaround.
If it's not available in the XF layer, then I wouldn't mind doing a custom renderer to insert a header view within the Telerik ListView.
Anyone could guide me how I could achieve this?

Thanks heaps!

Regards,

Sheny
Hale
Top achievements
Rank 1
 answered on 20 Mar 2018
4 answers
253 views

hi,

i have implemented rad auto complete succesfuly and its work perfect in android.

But when it comes to iOS, app crashes when i open page which contains RadAutoComplete. if i remove it page open and no crash.

Question - How to fix this ?

Error message

"NaN is not a valid value for width"

StackTrace

  at Xamarin.Forms.Size..ctor (System.Double width, System.Double height) [0x00008] in D:\agent_work\1\s\Xamarin.Forms.Core\Size.cs:19 
  at Xamarin.Forms.VisualElement.GetSizeRequest (System.Double widthConstraint, System.Double heightConstraint) [0x00000] in D:\agent_work\1\s\Xamarin.Forms.Core\VisualElement.cs:464 
  at Xamarin.Forms.VisualElement.Measure (System.Double widthConstraint, System.Double heightConstraint, Xamarin.Forms.MeasureFlags flags) [0x00054] in D:\agent_work\1\s\Xamarin.Forms.Core\VisualElement.cs:535 
  at Xamarin.Forms.Grid.ExpandLastAutoColumnIfNeeded (System.Double width, System.Boolean expandToRequest) [0x00058] in D:\agent_work\1\s\Xamarin.Forms.Core\GridCalc.cs:337 
  at Xamarin.Forms.Grid.MeasureGrid (System.Double width, System.Double height, System.Boolean requestSize) [0x0013a] in D:\agent_work\1\s\Xamarin.Forms.Core\GridCalc.cs:520 
  at Xamarin.Forms.Grid.OnSizeRequest (System.Double widthConstraint, System.Double heightConstraint) [0x0002a] in D:\agent_work\1\s\Xamarin.Forms.Core\GridCalc.cs:58 
  at Xamarin.Forms.VisualElement.OnMeasure (System.Double widthConstraint, System.Double heightConstraint) [0x00000] in D:\agent_work\1\s\Xamarin.Forms.Core\VisualElement.cs:601 
  at Xamarin.Forms.VisualElement.GetSizeRequest (System.Double widthConstraint, System.Double heightConstraint) [0x00053] in D:\agent_work\1\s\Xamarin.Forms.Core\VisualElement.cs:477 
  at Xamarin.Forms.Layout.GetSizeRequest (System.Double widthConstraint, System.Double heightConstraint) [0x00000] in D:\agent_work\1\s\Xamarin.Forms.Core\Layout.cs:121 
  at Xamarin.Forms.VisualElement.Measure (System.Double widthConstraint, System.Double heightConstraint, Xamarin.Forms.MeasureFlags flags) [0x00054] in D:\agent_work\1\s\Xamarin.Forms.Core\VisualElement.cs:535 
  at Xamarin.Forms.ScrollView.LayoutChildren (System.Double x, System.Double y, System.Double width, System.Double height) [0x0006d] in D:\agent_work\1\s\Xamarin.Forms.Core\ScrollView.cs:183 
  at Xamarin.Forms.Layout.UpdateChildrenLayout () [0x0014b] in D:\agent_work\1\s\Xamarin.Forms.Core\Layout.cs:245 
  at Xamarin.Forms.Layout.OnSizeAllocated (System.Double width, System.Double height) [0x0000f] in D:\agent_work\1\s\Xamarin.Forms.Core\Layout.cs:205 
  at Xamarin.Forms.VisualElement.SizeAllocated (System.Double width, System.Double height) [0x00000] in D:\agent_work\1\s\Xamarin.Forms.Core\VisualElement.cs:637 
  at Xamarin.Forms.VisualElement.SetSize (System.Double width, System.Double height) [0x00021] in D:\agent_work\1\s\Xamarin.Forms.Core\VisualElement.cs:788 
  at Xamarin.Forms.VisualElement.set_Bounds (Xamarin.Forms.Rectangle value) [0x0005d] in D:\agent_work\1\s\Xamarin.Forms.Core\VisualElement.cs:159 
  at Xamarin.Forms.VisualElement.Layout (Xamarin.Forms.Rectangle bounds) [0x00000] in D:\agent_work\1\s\Xamarin.Forms.Core\VisualElement.cs:519 
  at Xamarin.Forms.Layout.LayoutChildIntoBoundingRegion (Xamarin.Forms.VisualElement child, Xamarin.Forms.Rectangle region) [0x0016b] in D:\agent_work\1\s\Xamarin.Forms.Core\Layout.cs:159 
  at Xamarin.Forms.Grid.LayoutChildren (System.Double x, System.Double y, System.Double width, System.Double height) [0x00144] in D:\agent_work\1\s\Xamarin.Forms.Core\GridCalc.cs:48 
  at Xamarin.Forms.Layout.UpdateChildrenLayout () [0x0014b] in D:\agent_work\1\s\Xamarin.Forms.Core\Layout.cs:245 
  at Xamarin.Forms.Layout.OnSizeAllocated (System.Double width, System.Double height) [0x0000f] in D:\agent_work\1\s\Xamarin.Forms.Core\Layout.cs:205 
  at Xamarin.Forms.VisualElement.SizeAllocated (System.Double width, System.Double height) [0x00000] in D:\agent_work\1\s\Xamarin.Forms.Core\VisualElement.cs:637 
  at Xamarin.Forms.VisualElement.SetSize (System.Double width, System.Double height) [0x00021] in D:\agent_work\1\s\Xamarin.Forms.Core\VisualElement.cs:788 
  at Xamarin.Forms.VisualElement.set_Bounds (Xamarin.Forms.Rectangle value) [0x0005d] in D:\agent_work\1\s\Xamarin.Forms.Core\VisualElement.cs:159 
  at Xamarin.Forms.VisualElement.Layout (Xamarin.Forms.Rectangle bounds) [0x00000] in D:\agent_work\1\s\Xamarin.Forms.Core\VisualElement.cs:519 
  at Xamarin.Forms.Layout.LayoutChildIntoBoundingRegion (Xamarin.Forms.VisualElement child, Xamarin.Forms.Rectangle region) [0x0016b] in D:\agent_work\1\s\Xamarin.Forms.Core\Layout.cs:159 
  at Xamarin.Forms.Page.LayoutChildren (System.Double x, System.Double y, System.Double width, System.Double height) [0x0010d] in D:\agent_work\1\s\Xamarin.Forms.Core\Page.cs:181 
  at Xamarin.Forms.Page.UpdateChildrenLayout () [0x000c6] in D:\agent_work\1\s\Xamarin.Forms.Core\Page.cs:253 
  at Xamarin.Forms.Page.OnSizeAllocated (System.Double width, System.Double height) [0x0000f] in D:\agent_work\1\s\Xamarin.Forms.Core\Page.cs:234 
  at Xamarin.Forms.VisualElement.SizeAllocated (System.Double width, System.Double height) [0x00000] in D:\agent_work\1\s\Xamarin.Forms.Core\VisualElement.cs:637 
  at Xamarin.Forms.VisualElement.SetSize (System.Double width, System.Double height) [0x00021] in D:\agent_work\1\s\Xamarin.Forms.Core\VisualElement.cs:788 
  at Xamarin.Forms.VisualElement.set_Bounds (Xamarin.Forms.Rectangle value) [0x0005d] in D:\agent_work\1\s\Xamarin.Forms.Core\VisualElement.cs:159 
  at Xamarin.Forms.VisualElement.Layout (Xamarin.Forms.Rectangle bounds) [0x00000] in D:\agent_work\1\s\Xamarin.Forms.Core\VisualElement.cs:519 
  at Xamarin.Forms.Layout.LayoutChildIntoBoundingRegion (Xamarin.Forms.VisualElement child, Xamarin.Forms.Rectangle region) [0x0000a] in D:\agent_work\1\s\Xamarin.Forms.Core\Layout.cs:131 
  at Xamarin.Forms.Page.LayoutChildren (System.Double x, System.Double y, System.Double width, System.Double height) [0x0010d] in D:\agent_work\1\s\Xamarin.Forms.Core\Page.cs:181 
  at Xamarin.Forms.Page.UpdateChildrenLayout () [0x000c6] in D:\agent_work\1\s\Xamarin.Forms.Core\Page.cs:253 
  at Xamarin.Forms.Page.OnSizeAllocated (System.Double width, System.Double height) [0x0000f] in D:\agent_work\1\s\Xamarin.Forms.Core\Page.cs:234 
  at Xamarin.Forms.VisualElement.SizeAllocated (System.Double width, System.Double height) [0x00000] in D:\agent_work\1\s\Xamarin.Forms.Core\VisualElement.cs:637 
  at Xamarin.Forms.VisualElement.SetSize (System.Double width, System.Double height) [0x00021] in D:\agent_work\1\s\Xamarin.Forms.Core\VisualElement.cs:788 
  at Xamarin.Forms.VisualElement.set_Bounds (Xamarin.Forms.Rectangle value) [0x0005d] in D:\agent_work\1\s\Xamarin.Forms.Core\VisualElement.cs:159 
  at Xamarin.Forms.VisualElement.Layout (Xamarin.Forms.Rectangle bounds) [0x00000] in D:\agent_work\1\s\Xamarin.Forms.Core\VisualElement.cs:519 
  at Xamarin.Forms.Layout.LayoutChildIntoBoundingRegion (Xamarin.Forms.VisualElement child, Xamarin.Forms.Rectangle region) [0x0000a] in D:\agent_work\1\s\Xamarin.Forms.Core\Layout.cs:131 
  at Xamarin.Forms.Page.LayoutChildren (System.Double x, System.Double y, System.Double width, System.Double height) [0x0010d] in D:\agent_work\1\s\Xamarin.Forms.Core\Page.cs:181 
  at Xamarin.Forms.Page.UpdateChildrenLayout () [0x000c6] in D:\agent_work\1\s\Xamarin.Forms.Core\Page.cs:253 
  at Xamarin.Forms.Page.OnSizeAllocated (System.Double width, System.Double height) [0x0000f] in D:\agent_work\1\s\Xamarin.Forms.Core\Page.cs:234 
  at Xamarin.Forms.VisualElement.SizeAllocated (System.Double width, System.Double height) [0x00000] in D:\agent_work\1\s\Xamarin.Forms.Core\VisualElement.cs:637 
  at Xamarin.Forms.Page.OnChildMeasureInvalidated (Xamarin.Forms.VisualElement child, Xamarin.Forms.Internals.InvalidationTrigger trigger) [0x000a9] in D:\agent_work\1\s\Xamarin.Forms.Core\Page.cs:292 
  at Xamarin.Forms.Page.OnChildMeasureInvalidated (System.Object sender, System.EventArgs e) [0x00013] in D:\agent_work\1\s\Xamarin.Forms.Core\Page.cs:216 
  at Xamarin.Forms.VisualElement.InvalidateMeasureInternal (Xamarin.Forms.Internals.InvalidationTrigger trigger) [0x0000b] in D:\agent_work\1\s\Xamarin.Forms.Core\VisualElement.cs:669 
  at Xamarin.Forms.VisualElement.set_IsPlatformEnabled (System.Boolean value) [0x0001c] in D:\agent_work\1\s\Xamarin.Forms.Core\VisualElement.cs:377 
  at Xamarin.Forms.Platform.iOS.Platform+<>c.<.cctor>b__51_0 (Xamarin.Forms.BindableObject bindable, System.Object oldvalue, System.Object newvalue) [0x0000a] in <bc5a3d4303744676b3b36f4254bb697d>: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) [0x0011b] in D:\agent_work\1\s\Xamarin.Forms.Core\BindableObject.cs:605 
  at Xamarin.Forms.BindableObject.SetValueCore (Xamarin.Forms.BindableProperty property, System.Object value, Xamarin.Forms.Internals.SetValueFlags attributes, Xamarin.Forms.BindableObject+SetValuePrivateFlags privateAttributes) [0x0015b] in D:\agent_work\1\s\Xamarin.Forms.Core\BindableObject.cs:399 
  at Xamarin.Forms.BindableObject.SetValue (Xamarin.Forms.BindableProperty property, System.Object value, System.Boolean fromStyle, System.Boolean checkAccess) [0x0005f] in D:\agent_work\1\s\Xamarin.Forms.Core\BindableObject.cs:552 
  at Xamarin.Forms.BindableObject.SetValue (Xamarin.Forms.BindableProperty property, System.Object value) [0x00000] in D:\agent_work\1\s\Xamarin.Forms.Core\BindableObject.cs:92 
  at Xamarin.Forms.Platform.iOS.Platform.SetRenderer (Xamarin.Forms.VisualElement bindable, Xamarin.Forms.Platform.iOS.IVisualElementRenderer value) [0x00000] in <bc5a3d4303744676b3b36f4254bb697d>:0 
  at Xamarin.Forms.Platform.iOS.NavigationRenderer.CreateViewControllerForPage (Xamarin.Forms.Page page) [0x0000f] in <bc5a3d4303744676b3b36f4254bb697d>:0 
  at Xamarin.Forms.Platform.iOS.NavigationRenderer+<OnPushAsync>d__45.MoveNext () [0x00016] in <bc5a3d4303744676b3b36f4254bb697d>:0 
--- End of stack trace from previous location where exception was thrown ---
  at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.8.0.20/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:152 
  at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00037] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.8.0.20/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 
  at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.8.0.20/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 
  at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.8.0.20/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 
  at System.Runtime.CompilerServices.TaskAwaiter`1[TResult].GetResult () [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.8.0.20/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:357 
  at Xamarin.Forms.NavigationPage+<PushAsyncInner>d__79.MoveNext () [0x00095] in D:\agent_work\1\s\Xamarin.Forms.Core\NavigationPage.cs:360 
--- End of stack trace from previous location where exception was thrown ---
  at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.8.0.20/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:152 
  at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00037] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.8.0.20/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 
  at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.8.0.20/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 
  at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.8.0.20/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 
  at System.Runtime.CompilerServices.TaskAwaiter.GetResult () [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.8.0.20/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:113 
  at Xamarin.Forms.NavigationPage+<PushAsync>d__52.MoveNext () [0x0017f] in D:\agent_work\1\s\Xamarin.Forms.Core\NavigationPage.cs:200 
--- End of stack trace from previous location where exception was thrown ---
  at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.8.0.20/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:152 
  at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00037] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.8.0.20/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 
  at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.8.0.20/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 
  at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.8.0.20/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 
  at System.Runtime.CompilerServices.TaskAwaiter.GetResult () [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.8.0.20/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:113 
  at Medarbeideren.ViewModels.Implementations.MainPageViewModel+<<get_AddNewAppmntCommand>b__24_0>d.MoveNext () [0x00270] in /Users/xamarindev/Documents/Medarbeideren/Medar_UI/Medarbeideren/Medarbeideren/Medarbeideren/ViewModels/Implementations/MainPageViewModel.cs:164 
--- End of stack trace from previous location where exception was thrown ---
  at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.8.0.20/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:152 
  at System.Runtime.CompilerServices.AsyncMethodBuilderCore+<>c.<ThrowAsync>b__6_0 (System.Object state) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.8.0.20/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1018 
  at UIKit.UIKitSynchronizationContext+<Post>c__AnonStorey0.<>m__0 () [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.8.0.20/src/Xamarin.iOS/UIKit/UIKitSynchronizationContext.cs:24 
  at Foundation.NSAsyncActionDispatcher.Apply () [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.8.0.20/src/Xamarin.iOS/Foundation/NSAction.cs:163 
  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 

UI structure

<Grid Grid.Row="8" Grid.ColumnSpan="5">
                        <Grid.RowDefinitions>
                            <RowDefinition Height="Auto"/>
                            <RowDefinition Height="Auto"/>
                        </Grid.RowDefinitions>
                        <Label Style="{StaticResource AppointmentViewLabelStyle}" Text="{i18n:Translate APPOINT_OWNER}"
                               VerticalOptions="Center"/>
                        <Frame x:Name="ownerautocomplete" Grid.Row="1"  Style="{StaticResource CommonFrameStyle}">
                            <telerikInput:RadAutoComplete  x:Name="AutoCompleteOwner" ItemsSource="{Binding ContactsListOwner,Mode=TwoWay}"                                                                                                                    
                                                           Watermark="{i18n:Translate SEARCH_SEARCH_RESOURCES}"                                                           
                                                           DisplayMode="Plain"
                                                           Margin="0" BorderColor="Transparent" TextSearchPath="Name"                                                          
                                                           NoResultsMessage="{i18n:Translate SEARCH_SEARCH_NO_RESULT}"
                                                           FontFamily="{StaticResource PlatformBaseFontFamily}"
                                                           SuggestionViewBackgroundColor="White"
                                                           SuggestionItemSelected="AutoCompleteOwner_SuggestionItemSelected"/>
                        </Frame>
                         
 
                       
                    </Grid>
Lance | Senior Manager Technical Support
Telerik team
 answered on 16 Mar 2018
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