SlideDrawer working in Android but not in iOS Simulator

[Mark]

I snagged the sample sideDrawer from the github repo with all the xamarin.forms samples for telerik and have been able to get the sideDrawer working pretty nicely in Android (physical device + vysor) but when I try and run my app in iOS I get the following error:

 

Unhandled Exception:

Xamarin.Forms.Xaml.XamlParseException: Position 158:38. Type telerikListView:ListViewItemStyle not found in xmlns clr-namespace:Telerik.XamarinForms.DataControls.ListView;assembly=Telerik.XamarinForms.DataControls

 

heres were i snagged the code:

https://github.com/telerik/telerik-xamarin-forms-samples/tree/master/QSF

The QSF folders...

[Lance | Senior Manager Technical Support]

Hi Mark,

When using custom controls in Xamarin.Forms that reside in external assemblies on iOS, you need to give the control an x:Name or enable XAML Compilation. Otherwise the iOS Linker will not include the dependent code.

If it is not included by the Linker, then you'll get a runtime XamlParseException like you're seeing. Since you just copied out the code form the demo, this is likely what happened.

To fix it, enable XamlC for your project:

[assembly: XamlCompilation(XamlCompilationOptions.Compile)]
namespace YourAppNamespace
{
    public partial class App : Application
    {
        public App()
        {
            InitializeComponent();
        }
    }
}

If you have any further issues, please open a support ticket here and include the code you're using so that we can investigate further.

Regards,
Lance | Tech Support Engineer, Sr.
Progress Telerik

[Mark]

it worked but only after i did the following:

cleaned solution

rebuilt solution (still had build errors)

unloaded android/ios/uwp apps leaving just the XAML app...

rebuilt...still got build errors...something relating to using the <OnPlatform> type argument to set the FontSize property of a few <Label> controls. Once those removed. the XAML app builds.

reloaded android. built...success

reloaded ios built....success...

 

super weird.

[Lance | Senior Manager Technical Support]

Hi Mark,

Visual Studio and Xamarin is known to have quirks like this, there is also an issue that happens from time to time where the PCL project's assembly doesn't get updated when you make changes.

This leads to maddening behavior where you know you just made changes to the PCL but they're not appearing in the deployed project or you're seeing an exception that you know you just fixed.

The best way to eliminate this when it starts happening is to clean/rebuild the PCL project first, then do a clean/rebuild on the platform target project (don't rely on solution "rebuild all"). The Visual Studio team is aware of this and state that they're working on it.

Regards,
Lance | Tech Support Engineer, Sr.
Progress Telerik