Xamarin.forms.googlemaps: [iOS] Exception: Specified cast is not valid

[talhaa91]

Steps to reproduce

• Navigate to map page with PushAsync as a NavigationPage
• Pop the map page with PopAsync
• Exception occurs

Exception

Message: Specified cast is not valid
Source: Xamarin.Forms.GoogleMaps.iOS
StackTrace:

at Xamarin.Forms.GoogleMaps.iOS.MapRenderer.OnElementChanged (Xamarin.Forms.Platform.iOS.ElementChangedEventArgs`1 e) [0x00046] in <filename unknown>:0 
  at Xamarin.Forms.Platform.iOS.VisualElementRenderer`1[TElement].SetElement (Xamarin.Forms.Platform.iOS.TElement element) [0x00118] in <filename unknown>:0 
  at Xamarin.Forms.Platform.iOS.VisualElementRenderer`1[TElement].Dispose (Boolean disposing) [0x0007b] in <filename unknown>:0 
  at Xamarin.Forms.Platform.iOS.ViewRenderer`2[TView,TNativeView].Dispose (Boolean disposing) [0x00000] in <filename unknown>:0 
  at Xamarin.Forms.GoogleMaps.iOS.MapRenderer.Dispose (Boolean disposing) [0x0010b] in <filename unknown>:0 
  at Foundation.NSObject.Dispose () [0x00000] in /Users/builder/data/lanes/3339/39ebb778/source/maccore/src/Foundation/NSObject2.cs:130 
  at Xamarin.Forms.Platform.iOS.Platform.DisposeModelAndChildrenRenderers (Xamarin.Forms.Element view) [0x00038] in <filename unknown>:0 
  at Xamarin.Forms.Platform.iOS.Platform.HandleChildRemoved (System.Object sender, Xamarin.Forms.ElementEventArgs e) [0x00007] in <filename unknown>:0 
  at Xamarin.Forms.Element.OnDescendantRemoved (Xamarin.Forms.Element child) [0x00015] in <filename unknown>:0 
  at Xamarin.Forms.Element.OnChildRemoved (Xamarin.Forms.Element child) [0x00021] in <filename unknown>:0 
  at Xamarin.Forms.VisualElement.OnChildRemoved (Xamarin.Forms.Element child) [0x00000] in <filename unknown>:0 
  at Xamarin.Forms.Page.OnInternalRemoved (Xamarin.Forms.VisualElement view) [0x00013] in <filename unknown>:0 
  at Xamarin.Forms.Page.InternalChildrenOnCollectionChanged (System.Object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x00022] in <filename unknown>:0 
  at System.Collections.ObjectModel.ObservableCollection`1[T].OnCollectionChanged (System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x00012] in /Users/builder/data/lanes/3339/39ebb778/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/external/referencesource/System/compmod/system/collections/objectmodel/observablecollection.cs:288 
  at System.Collections.ObjectModel.ObservableCollection`1[T].OnCollectionChanged (NotifyCollectionChangedAction action, System.Object item, Int32 index) [0x00000] in /Users/builder/data/lanes/3339/39ebb778/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/external/referencesource/System/compmod/system/collections/objectmodel/observablecollection.cs:351 
  at System.Collections.ObjectModel.ObservableCollection`1[T].RemoveItem (Int32 index) [0x0002b] in /Users/builder/data/lanes/3339/39ebb778/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/external/referencesource/System/compmod/system/collections/objectmodel/observablecollection.cs:205 
  at System.Collections.ObjectModel.Collection`1[T].Remove (System.Collections.ObjectModel.T item) [0x0002d] in /Users/builder/data/lanes/3339/39ebb778/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/external/referencesource/mscorlib/system/collections/objectmodel/collection.cs:113 
  at Xamarin.Forms.NavigationPage+<PopAsyncInner>d__58.MoveNext () [0x00123] in <filename unknown>:0

[amay077]

Thanks for reporting.

This issue will solves in v1.4.0.
Please wait a moment.

[talhaa91]

Kindly include this in the pre-release too,

[amay077]

I deployed v1.4.0-beta1 to nuget.
https://www.nuget.org/packages/Xamarin.Forms.GoogleMaps/1.4.0-beta1

This release contains as follows:

• Support custom marker #33
• [iOS] Exception: Specified cast is not valid #38

You can try "CUSTOM PIN" in XFGoogleMapSample(develop branch).

[amay077]

v1.4.0 is now stable!
https://www.nuget.org/packages/Xamarin.Forms.GoogleMaps/1.4.0