Pending Review
Last Updated: 19 Jul 2019 22:36 by ADMIN
Created by: Precise Developer
Comments: 2
Category: Entry
Type: Bug Report

Any version of Xamarin.Forms, the iOS version of the application crashes when attempting to apply a custom font "parameter descriptor cannot  be null"  


With this resource defined, and the OpenSans-Bold.ttf is in the Resources directory, marked as bundle resource...

<OnPlatform x:TypeArguments="x:String" x:Key="BoldFont">
    <On Platform="Android" Value="OpenSans-Bold.ttf#Open Sans" />
    <On Platform="iOS" Value="OpenSans-Bold" />

And using this code for the style (created from the Telerik login view template, with some modifications):


    <Style x:Key="LoginEntryStyle"
        <Setter Property="TextColor"
                Value="{StaticResource DarkTextColor}" />
        <Setter Property="WatermarkTextColor"
                Value="{StaticResource LightBlueColor}" />
        <Setter Property="FontSize"
                Value="14" />
        <Setter Property="FontFamily"
                Value="{StaticResource BoldFont}" />
        <Setter Property="HeightRequest"
                Value="48" />
        <Setter Property="Margin"
                Value="0,0,0,16" />
        <Setter Property="BorderStyle">
                <telerikInput:BorderStyle BorderColor="{StaticResource LightBlueColor}"
                                          CornerRadius="8" />

Last Updated: 18 Jul 2019 11:05 by ADMIN

Currently, if the value contains longer text, the barcode is not expanding, just uses smaller points to accommodate it. 

In addition, the barcode does not take all the available space (with Stretch Sizing mode).

Last Updated: 18 Jul 2019 10:22 by ADMIN
It is applied only when the control is on focus.
Pending Review
Last Updated: 18 Jul 2019 16:47 by ADMIN


I rolled my app with the ListView out to production and are getting 8+ crashes a day from 140 users with the above issue. I have included a stack trace. I cannot find the steps to reproduce the issue in development. I have rolled back to using the native ListView as this does not crash the app.

Attached is an example project to see what I am doing in general terms, but I have not been able to reproduce this crash in it.

My guess is that a DataTemplate is not being cleaned up properly and when the data behind is changed it attempts to access the control that represented the data in the DataTemplate.


Xamarin caused by: android.runtime.JavaProxyThrowable: System.ObjectDisposedException: Cannot access a disposed object.
Object name: 'Android.Support.V7.Widget.SwitchCompat'.
Java.Interop.JniPeerMembers.AssertSelf(IJavaPeerable self)<9cb01525c8ce48268eb7a54e1b653d67>:0
Java.Interop.JniPeerMembers.JniInstanceMethods.InvokeVirtualVoidMethod(string encodedMember, IJavaPeerable self, JniArgumentValue* parameters)<9cb01525c8ce48268eb7a54e1b653d67>:0
Android.Widget.CompoundButton.set_Checked(bool value)<83e36ed05052486983583851de96589e>:0
Xamarin.Forms.Platform.Android.AppCompat.SwitchRenderer.HandleToggled(object sender, EventArgs e)<e6fe81c4055a4db5bd435b7d12d894e3>:0
at Xamarin.Forms.Switch+<>c.<.cctor>b__14_0 (Xamarin.Forms.BindableObject bindable, System.Object oldValue, System.Object newValue) [0x0001c] in <209f66ed8fe04cb6a815feb8c3b62471>:0
Xamarin.Forms.BindableObject.SetValueActual(BindableProperty property, BindableObject.BindablePropertyContext context, object value, bool currentlyApplying, SetValueFlags attributes, bool silent)<209f66ed8fe04cb6a815feb8c3b62471>:0
Xamarin.Forms.BindableObject.SetValueCore(BindableProperty property, object value, SetValueFlags attributes, BindableObject.SetValuePrivateFlags privateAttributes)<209f66ed8fe04cb6a815feb8c3b62471>:0
Xamarin.Forms.BindingExpression.ApplyCore(object sourceObject, BindableObject target, BindableProperty property, bool fromTarget)<209f66ed8fe04cb6a815feb8c3b62471>:0
Xamarin.Forms.BindingExpression.Apply(bool fromTarget)<209f66ed8fe04cb6a815feb8c3b62471>:0
Java.Lang.IRunnableInvoker.n_Run(IntPtr jnienv, IntPtr native__this)<83e36ed05052486983583851de96589e>:0
at (wrapper dynamic-method) System.Object.31(intptr,intptr) Method)
java.lang.reflect.Method.invoke(Native Method)


Last Updated: 17 Jul 2019 12:33 by ADMIN
Created by: Scott
Comments: 0
Category: Calendar & Scheduling
Type: Feature Request
Add a View that displays a list of the scheduled appointments.
Last Updated: 18 Jul 2019 13:17 by ADMIN
System.NullReferenceException is thrown when navigating back pages with RadListView and using Xamarin.Forms 4.0 or higher. 
Last Updated: 15 Jul 2019 14:20 by ADMIN
With the current implementation of the control you can enter all symbols, so provide an option to change the keyboard type. 
Last Updated: 15 Jul 2019 10:36 by ADMIN
Created by: Matt
Comments: 0
Category: PdfViewer
Type: Feature Request

Provide support for Interactive Forms (AcroForms) in the PDF Viewer for Xamarin.

For detailed information on Interactive Forms concept check below:

Last Updated: 15 Jul 2019 08:38 by ADMIN
When you set custom stroke to ScatterLineSeries, the colors in the RadLegend are not updated.
Last Updated: 16 Jul 2019 10:05 by ADMIN

Provide an easy way to position the popup in the center of the screen in a MVVM-friendly manner. 

Consider the case when the target is a view that carries information about the popup and cannot be the page.

Last Updated: 16 Jul 2019 09:57 by ADMIN
Created by: Mohamed
Comments: 1
Category: DataForm
Type: Bug Report

Please refer to the attached project that reproduces the issue. In the MainPage constructor, you can switch between using the PickerEditor (validation works) and the SegmentedEditor (validation doesn't work).

// Works with validation
dataForm.RegisterEditor("Location", EditorType.PickerEditor);
// Doesn't work with validation
//dataForm.RegisterEditor("Location", EditorType.SegmentedEditor);

This leads to other issues like the PropertyValidationCompleted event not firing.

Thank you,

Last Updated: 09 Jul 2019 14:28 by ADMIN

When RadCalendar is inside Xamarin Forms Tabbed Page. Switching between tabs triggers Calendar SelectionChanged and the calendar DisplayDate is changed. 

the issue could not be reproduced when RadTabView is used and its IsContentPreserved property is set to true.

In Development
Last Updated: 15 Jul 2019 08:00 by ADMIN
When I try to set the MinorTicksFill color of the TKGaugeLinearScale Ticks, I get an exception at runtime.
Last Updated: 05 Jul 2019 09:30 by ADMIN
When the control lost focus and tokens almost fill all the space, the ShowMoreTemplate causes flickering.
Last Updated: 05 Jul 2019 07:58 by ADMIN
If the TimelineInterval property of the DayViewSettings is set to 1 hour, and the DayEndTime is, for example, "18.30", the last 30 minutes are not visualized in the Calendar View.
Last Updated: 04 Jul 2019 15:07 by ADMIN
Provide a way to associate a FilterDescriptor with a TemplatedColumn
Last Updated: 16 Jul 2019 09:51 by ADMIN

If you have a Chart with BarSeries and TooltipBehavior defined, the tooltip of each bar is shown only when the user taps in the area around the tip of the bar.

The expected behavior is the tooltip to be displayed when clicking anywhere on the bar.

In Development
Last Updated: 18 Jul 2019 12:16 by ADMIN
SelectedIndex does not stay in sync when removing items from ObservableCollection bound as ItemsSource.  When deleting Index 2, SelectedIndex correctly moves to 1, but Slideview moves to index 0
Last Updated: 03 Jul 2019 11:17 by ADMIN
When you use a DataForm with a GridLayout and set ColumnSpan property of the DisplayOptions for two columns in the same row, only the second column is shown on the screen on Android.
Last Updated: 03 Jul 2019 09:19 by ADMIN
Created by: Fabrice
Comments: 0
Category: PdfViewer
Type: Bug Report
For example, if you scroll down and then scroll up to the previous pages, they do not show any content.
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