Xamarin.forms: CarouselView on iOS in XamarinForms 3.6: System.InvalidCastException: Specified cast is not valid.

[Ferenesht]

Description

When trying to use the CarouselView after updating to Xamarin Forms 3.6 the iOS app crashes in the Main function of the Application class with the following exception:

System.InvalidCastException: Specified cast is not valid.

The CarouselView works perfect on Android without any issues.

Stacktrace:

{System.InvalidCastException: Specified cast is not valid.
at (wrapper castclass) System.Object.__castclass_with_cache(object,intptr,intptr)
at Xamarin.Forms.Internals.Registrar1[TRegistrable].GetHandler (System.Type type, System.Type visualType) [0x00030] in D:\a\1\s\Xamarin.Forms.Core\Registrar.cs:56 at Xamarin.Forms.Internals.Registrar1[TRegistrable].GetHandlerForObject[TOut] (System.Object obj) [0x0002c] in D:\a\1\s\Xamarin.Forms.Core\Registrar.cs:91
at Xamarin.Forms.Platform.iOS.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x00005] in <0648e2dffe9e4201b8c6e274ced6579f>:0
at Xamarin.Forms.Platform.iOS.VisualElementPackager.OnChildAdded (Xamarin.Forms.VisualElement view) [0x0003d] in <0648e2dffe9e4201b8c6e274ced6579f>:0
at Xamarin.Forms.Platform.iOS.VisualElementPackager.Load () [0x0001e] in <0648e2dffe9e4201b8c6e274ced6579f>:0
at Xamarin.Forms.Platform.iOS.VisualElementRenderer1[TElement].SetElement (TElement element) [0x000de] in <0648e2dffe9e4201b8c6e274ced6579f>:0 at Xamarin.Forms.Platform.iOS.VisualElementRenderer1[TElement].Xamarin.Forms.Platform.iOS.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00000] in <0648e2dffe9e4201b8c6e274ced6579f>:0
at Xamarin.Forms.Platform.iOS.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x00014] in <0648e2dffe9e4201b8c6e274ced6579f>:0
at Xamarin.Forms.Platform.iOS.VisualElementPackager.OnChildAdded (Xamarin.Forms.VisualElement view) [0x0003d] in <0648e2dffe9e4201b8c6e274ced6579f>:0
at Xamarin.Forms.Platform.iOS.VisualElementPackager.Load () [0x0001e] in <0648e2dffe9e4201b8c6e274ced6579f>:0
at Xamarin.Forms.Platform.iOS.PageRenderer.ViewDidLoad () [0x00086] in <0648e2dffe9e4201b8c6e274ced6579f>:0
at (wrapper managed-to-native) ObjCRuntime.Messaging.IntPtr_objc_msgSendSuper(intptr,intptr)
at UIKit.UIViewController.get_View () [0x0002a] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.2.1.15/src/Xamarin.iOS/UIKit/UIViewController.g.cs:2983
at Xamarin.Forms.Platform.iOS.PageRenderer.get_NativeView () [0x00008] in <0648e2dffe9e4201b8c6e274ced6579f>:0
at Xamarin.Forms.Platform.iOS.PageRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x0004f] in <0648e2dffe9e4201b8c6e274ced6579f>:0
at Xamarin.Forms.Platform.iOS.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x00014] in <0648e2dffe9e4201b8c6e274ced6579f>:0
at Xamarin.Forms.Platform.iOS.Platform.AddChild (Xamarin.Forms.VisualElement view) [0x00027] in <0648e2dffe9e4201b8c6e274ced6579f>:0
at Xamarin.Forms.Platform.iOS.Platform.WillAppear () [0x00043] in <0648e2dffe9e4201b8c6e274ced6579f>:0
at Xamarin.Forms.Platform.iOS.PlatformRenderer.ViewWillAppear (System.Boolean animated) [0x00016] in <0648e2dffe9e4201b8c6e274ced6579f>:0
at (wrapper managed-to-native) ObjCRuntime.Messaging.void_objc_msgSend_IntPtr(intptr,intptr,intptr)
at UIKit.UIWindow.set_RootViewController (UIKit.UIViewController value) [0x00008] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.2.1.15/src/Xamarin.iOS/UIKit/UIWindow.g.cs:335
at Xamarin.Forms.Platform.iOS.FormsApplicationDelegate.UpdateMainPage () [0x00043] in <0648e2dffe9e4201b8c6e274ced6579f>:0
at Xamarin.Forms.Platform.iOS.FormsApplicationDelegate.ApplicationOnPropertyChanged (System.Object sender, System.ComponentModel.PropertyChangedEventArgs args) [0x00012] in <0648e2dffe9e4201b8c6e274ced6579f>:0
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

Any ideas how to make the CarouselView work on iOS?

[samhouts]

@Ferenesht Can you please attach your sample project? Thanks!

[Ferenesht]

Sure thing!

https://github.com/bjorndaniel/CarouselViewBug

[Ralle1986]

I have the same issue

[danielmeza]

I have this issue with the 3.5 version.

[rmarinho]

CarouselView is not implemented yet, you could check the the branch we are working on https://github.com/xamarin/Xamarin.Forms/tree/spec-carousel

I can get you some nupkg to test if you want .

[kingces95]

Well, I can confirm that this worked on Android on the version posted, but not on the latest master.

[kingces95]

@Ferenesht the long and the short of it is that we don't really have a CV for you to preview at the moment. We got re-tasked to getting Shell working. So please stay tuned after Shell ships for new on CV. Gonna close this bug out for now but feel free to re-open once we get a public CV released to preview.

[rmarinho]

We aren't supporting CarouselView yet, we are tracking that work with the spec and you can try the implementation to give feedback using this pr https://github.com/xamarin/Xamarin.Forms/pull/5044

[akaruthethil-nlg]

Team,
When is CarouselView for iOS expected to be released?

Our app mainly depends on this control and we couldn't able to update XF to 4.0 and utilise its features completely.

[davidortinau]

@akaruthethil-nlg CarouselView is currently scheduled for 4.2. You can always check our roadmap here: https://github.com/xamarin/Xamarin.Forms/wiki/Feature-Roadmap#420-augustseptember-2019