Questions on UI for Xamarin Forum

0 answers

160 views

RadSideDrawer Drawer content is not fully visible for Android Low resolution devices(image attached)

The RadSideDrawer Drawer content is not fully visible for Android Low resolution devices. With the below same code for iOS there is not problem for any resolutions. And correct layout & incorrect layout snapshot also attached for the issue. Please help on this.

Thanks

ListView

SideDrawer

asked on 29 Jun 2023

3 answers

326 views

Xamarin.iOS 14 not compatible ?

Hello,

I can't check it by myself, so I ask it here :)

Yesterday I updated Visual Studio (PC) to 16.7.4, including Xamarin.IOS 14.0.0.0, and my app doesn't work anymore. Views including SideDrawer fail to load, with this exception : Object reference not set to an instance of an object (Run on physical iPhone 8 / iOS 13)

The same project, with the same but version of telerik libs, compiled last Friday with VS 16.7.2 (Xamarin.iOS 13.20.2.2) works fine. Android runs are OK too.

Does anyone else have this bug or it's on my side only ? I prefer not tu upgrade to iOS 14 on the iPhone, if possible...

Thank you :)

SideDrawer

answered on 05 Oct 2020

5 answers

166 views

Null Ref Error IOrderedTraversalController.UpdateTraversalOrder

We are unable to reproduce this crash, but our App.Center Analytics is reporting this error from some, but not all, of our customers

Version 2019.2.708

Crash::

System.NullReferenceException: Object reference not set to an instance of an object

IOrderedTraversalController.UpdateTraversalOrder ()
VisualElementRenderer`1[TElement].UpdateParentPageTraversalOrder ()
VisualElementRenderer`1[TElement].OnElementPropertyChanged (System.Object sender, System.ComponentModel.PropertyChangedEventArgs e)
(wrapper delegate-invoke) <Module>.invoke_void_object_PropertyChangedEventArgs(object,System.ComponentModel.PropertyChangedEventArgs)
BindableObject.OnPropertyChanged (System.String propertyName)
Element.OnPropertyChanged (System.String propertyName)
Element.set_Parent (Xamarin.Forms.Element value)
RadViewContainer.DetachInnerView ()
RadViewContainer.set_View (Xamarin.Forms.View value)
SideDrawerRenderer.RetireViewContainer (Telerik.XamarinForms.Common.Android.RadViewContainer viewContainer)
SideDrawerRenderer.RetireMainContent ()
SideDrawerRenderer.RetireViewContainers ()
SideDrawerRenderer.OnElementDetached (Telerik.XamarinForms.Primitives.RadSideDrawer oldElement)
AndroidRendererBase`2[S,T].Dispose (System.Boolean disposing)
Object.Dispose ()
VisualElementRenderer`1[TElement].Dispose (System.Boolean disposing)
Platform+DefaultRenderer.Dispose (System.Boolean disposing)
Object.Dispose ()
VisualElementRenderer`1[TElement].Dispose (System.Boolean disposing)
Platform+DefaultRenderer.Dispose (System.Boolean disposing)
Object.Dispose ()
VisualElementRenderer`1[TElement].Dispose (System.Boolean disposing)
Platform+DefaultRenderer.Dispose (System.Boolean disposing)
Object.Dispose ()
VisualElementRenderer`1[TElement].Dispose (System.Boolean disposing)
Platform+DefaultRenderer.Dispose (System.Boolean disposing)
Object.Dispose ()
VisualElementRenderer`1[TElement].Dispose (System.Boolean disposing)
Platform+DefaultRenderer.Dispose (System.Boolean disposing)
Object.Dispose ()
VisualElementRenderer`1[TElement].Dispose (System.Boolean disposing)
Platform+DefaultRenderer.Dispose (System.Boolean disposing)
Object.Dispose ()
VisualElementRenderer`1[TElement].Dispose (System.Boolean disposing)
Platform+DefaultRenderer.Dispose (System.Boolean disposing)
Object.Dispose ()
VisualElementRenderer`1[TElement].Dispose (System.Boolean disposing)
PageRenderer.Dispose (System.Boolean disposing)
Object.Dispose ()
FragmentContainer.OnDestroyView ()
Fragment.n_OnDestroyView (System.IntPtr jnienv, System.IntPtr native__this)
(wrapper dynamic-method) Android.Runtime.DynamicMethodNameCounter.74(intptr,intptr)

SideDrawer

answered on 22 Jan 2020

2 answers

178 views

Button to activate SideDrawer

Hi, i am tasked to do a cross platform mobile app for iOS and Android.

i need to create a SideDrawer which contain search filters. the button to activate this side drawer based on the design is supposed to be sticky on bottom left of the app.

wondering is it possible to be done on both platform and any sample for guide on how to do it?

SideDrawer

answered on 13 Aug 2019

1 answer

96 views

RadSideDrawer cannot be added to IGridList

I have been trying to get this example to work in my project using the content view and the content page both are getting me the same errro about the RadSideDrawer cannot be added to a collection of type IGridList. In My project I have a MainPage.xaml with a MasterDetailPage tag selected to the MenuPage.axml. Can you please let me know why I am getting this error.

https://www.telerik.com/blogs/getting-started-with-radsidedrawer-for-xamarin-forms

SideDrawer

answered on 27 Feb 2019

7 answers

454 views

SideDrawer on TabbedPage possible?

I need to add a side drawer to an app that has a Xamarin Forms TabbedPage as it's main page - I am aiming for the same navigation as e.g. the Twitter app on Android.

However the MainContent property of the RadSideDrawer is of type View instead of Page so I cannot set it to a TabbedPage instance.

-> Is it possible to use a TabbedPage with RadSideDrawer? If yes, how?

If this is not possible, would the standard Xamarin Forms MasterDetailPage, offer an alternative?
It has Master and Detail properties of type Page and it is used to create a side drawer in e.g. the Hanselman.Forms app (although not on a TabbedPage).

SideDrawer

answered on 03 Jan 2019

11 answers

462 views

RadSideDrawer - Issue with repainting when resizing window on UWP target

This is for UWP.

I have a SideDrawer and inside main content of side drawer I have a list view which I am binding from code behind. Now when I launch application, it renders fine, each row of list if occupying full width. Now when I maximize application, each row is now not resizing to full width. Again when I restore window size back to original, sometime it restores back to original state and sometime last column is not visible.

If I remove RadSideDrawer from xaml, its able to resize the elements well on maximize and restore.

I have created a sample application for this behavior and below is the xaml and codebehind file.

https://github.com/pbijvani/test/blob/master/MainPage.xaml

https://github.com/pbijvani/test/blob/master/MainPage.xaml.cs

attaching screenshot to show behavior.

https://github.com/pbijvani/test/blob/master/first_launch.PNG

https://github.com/pbijvani/test/blob/master/maximize.PNG

https://github.com/pbijvani/test/blob/master/restore_back.PNG

Appreciate any help on this.

SideDrawer

answered on 20 Dec 2018

2 answers

101 views

VisualElementRenderer UpdateTabStop Error

Hi,

I am getting an error with the SideDrawer after updating to the latest version of Xamarin Forms, the issue seems to occur when the back button is clicked and the SideDrawer is visible, we also have a TabbedPage in our app and if you click the same tab as is visible when the SideDrawer is visible it causes the same crash.

We use Azure mobile app centre, so all the information for the crash is below:

Xamarin.Forms Version - 3.3.0.912540

Telerik.UI Version - 2018.3.1018.1, we had the same issue with previous build too 2018.2.620.2 but tried upgrading.

Error is:

VisualElementRenderer`1[TElement].UpdateTabStop ()
System.NullReferenceException: Object reference not set to an instance of an object

Threads:

VisualElementRenderer`1[TElement].UpdateTabStop ()
IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element)
RadPlatform.RetireRenderer (Xamarin.Forms.VisualElement visualElement)
RadViewContainer.ClearContainer ()
RadViewContainer.Dispose (System.Boolean disposing)
NSObject.Dispose ()
SideDrawerRenderer.OnElementDetached (Telerik.XamarinForms.Primitives.RadSideDrawer oldElement)
IosRendererBase`2[S,T].OnElementChanged (Xamarin.Forms.Platform.iOS.ElementChangedEventArgs`1[TElement] e)
VisualElementRenderer`1[TElement].SetElement (TElement element)
VisualElementRenderer`1[TElement].Dispose (System.Boolean disposing)
ViewRenderer`2[TView,TNativeView].Dispose (System.Boolean disposing)
NSObject.Dispose ()
DisposeHelpers.DisposeModalAndChildRenderers (Xamarin.Forms.Element view)
Platform.HandleChildRemoved (System.Object sender, Xamarin.Forms.ElementEventArgs e)
Element.OnDescendantRemoved (Xamarin.Forms.Element child)
Element.OnDescendantRemoved (Xamarin.Forms.Element child)
Element.OnChildRemoved (Xamarin.Forms.Element child)
VisualElement.OnChildRemoved (Xamarin.Forms.Element child)
Page.OnInternalRemoved (Xamarin.Forms.VisualElement view)
Page.InternalChildrenOnCollectionChanged (System.Object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
ObservableCollection`1[T].OnCollectionChanged (System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
ObservableCollection`1[T].OnCollectionChanged (System.Collections.Specialized.NotifyCollectionChangedAction action, System.Object item, System.Int32 index)
ObservableCollection`1[T].RemoveItem (System.Int32 index)
Collection`1[T].Remove (T item)
NavigationPage+<Xamarin-Forms-INavigationPageController-RemoveAsyncInner>d__69.MoveNext ()
TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task)
TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task)
TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task)
TaskAwaiter`1[TResult].GetResult ()
NavigationRenderer+<UpdateFormsInnerNavigation>d__75.MoveNext ()
TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task)
TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task)
TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task)
TaskAwaiter.GetResult ()
NavigationRenderer+ParentingViewController+<DidMoveToParentViewController>d__41.MoveNext ()
AsyncMethodBuilderCore+<>c.<ThrowAsync>b__6_0 (System.Object state)
NSAsyncSynchronizationContextDispatcher.Apply ()
(wrapper managed-to-native) UIKit.UIApplication.UIApplicationMain(int,string[],intptr,intptr)
UIApplication.Main (System.String[] args, System.IntPtr principal, System.IntPtr delegate)
UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName)
Application.Main (System.String[] args)

SideDrawer

answered on 24 Oct 2018

1 answer

188 views

SideDrawer is working in Droid not in iOS Simulator

Hi,

In Xamarin Forms, the SideDrawer is appearing in Android but not appearing in iOS Simulator for which i looked into this earlier thread [Thread Link] but even after doing so mentioned in that thread as a fix, the SideDrawer still doesn't appear in the iOS Simulator please help me with this issue.

XAML Snippet :

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:telerikDataControls="clr-namespace:Telerik.XamarinForms.DataControls;assembly=Telerik.XamarinForms.DataControls"
             xmlns:telerikListView="clr-namespace:Telerik.XamarinForms.DataControls.ListView;assembly=Telerik.XamarinForms.DataControls"
             xmlns:telerikPrimitives="clr-namespace:Telerik.XamarinForms.Primitives;assembly=Telerik.XamarinForms.Primitives"
             x:Class="APP.LPage">

    <StackLayout BackgroundColor="White" Spacing="0" VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand">

        <telerikPrimitives:RadSideDrawer x:Name="drawer" DrawerLength="250" >
            <telerikPrimitives:RadSideDrawer.MainContent>

                                    </telerikListView:ListViewTemplateCell.View>
                                </telerikListView:ListViewTemplateCell>
                            </DataTemplate>
                        </telerikDataControls:RadListView.ItemTemplate>
                    </telerikDataControls:RadListView>
                </StackLayout>

            </telerikPrimitives:RadSideDrawer.MainContent>
            <telerikPrimitives:RadSideDrawer.DrawerContent>

                <StackLayout VerticalOptions="CenterAndExpand">
                    <Button Text="Button 1" />
                    <Button Text="Button 2"  />
                    <Button Text="Button 3"  />
                    <Button Text="Button 4"  />

                </StackLayout>

            </telerikPrimitives:RadSideDrawer.DrawerContent>
        </telerikPrimitives:RadSideDrawer>
    </StackLayout>
</ContentPage>

SideDrawer

answered on 02 Jul 2018

1 answer

111 views

Exception when setting SideDrawer.MainContent on Android

Relevant System Information:

- Using .NETStandard 2.0 Library

- Compile using Android 7.1

- Miminum android version 4.0.3

- Target Android version 5.1

- Xamarin Forms 2.4.18342

- Telerik UI for Xamarin R1 2018

I am trying to set the MainContent of the SideDrawer in a similar fashion to the "tagit" application from Telerik. I am using a Listview in the sidedrawer to drive the view switching. Whenever I set the main content I get the following exception:

Type: Java.Lang.IllegalStateException

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

UWP doesn't seem to have the same issue, just android. The weirdest part is that the main content seems to load just fine after the exception is handled. Does anybody else receive this error when setting the main content?

SideDrawer

answered on 08 May 2018