[Bug] StatusBarEffect is giving error on iOS

[kerberosargos]

Hello,

XCT version is 1.3.0-pre2 iOS Version is 12.5.5

I have tested on iOS 14.5 it is working

But it is not working on iOS 12.4

XAML

 <ContentPage
   ...
    xmlns:xct="http://xamarin.com/schemas/2020/toolkit"
    xct:StatusBarEffect.Color="Red">

info.plist

...
<key>UIUserInterfaceStyle</key>
<string>Light</string>
<key>UIStatusBarStyle</key>
<string>UIStatusBarStyleLightContent</string>
<key>UIViewControllerBasedStatusBarAppearance</key>
<false/>
...

Error

Unhandled Exception:
System.NullReferenceException: Object reference not set to an instance of an object
  at Xamarin.CommunityToolkit.iOS.Effects.PlatformStatusBarEffect.UpdateStatusBarAppearance (UIKit.UIWindow window) [0x00000] in <cc58859ad7e942d9972e5172dfa7035a>:0 
  at Xamarin.CommunityToolkit.iOS.Effects.PlatformStatusBarEffect.UpdateStatusBarAppearance () [0x00033] in <cc58859ad7e942d9972e5172dfa7035a>:0 
  at Xamarin.CommunityToolkit.iOS.Effects.PlatformStatusBarEffect.SetColor (Xamarin.Forms.Color color) [0x000b3] in <cc58859ad7e942d9972e5172dfa7035a>:0 
  at Xamarin.CommunityToolkit.iOS.Effects.PlatformStatusBarEffect.OnAttached () [0x0000b] in <cc58859ad7e942d9972e5172dfa7035a>:0 
  at Xamarin.Forms.Effect.SendAttached () [0x00009] in D:\a\1\s\Xamarin.Forms.Core\Effect.cs:54 
  at Xamarin.Forms.RoutingEffect.SendAttached () [0x00000] in D:\a\1\s\Xamarin.Forms.Core\RoutingEffect.cs:29 
  at Xamarin.Forms.Element.AttachEffect (Xamarin.Forms.Effect effec
t) [0x00045] in D:\a\1\s\Xamarin.Forms.Core\Element.cs:513 
  at Xamarin.Forms.Element.set_EffectControlProvider (Xamarin.Forms.IEffectControlProvider value) [0x0007c] in D:\a\1\s\Xamarin.Forms.Core\Element.cs:238 
  at Xamarin.Forms.Platform.iOS.EffectUtilities.RegisterEffectControlProvider (Xamarin.Forms.IEffectControlProvider self, Xamarin.Forms.IElementController oldElement, Xamarin.Forms.IElementController newElement) [0x0001a] in D:\a\1\s\Xamarin.Forms.Platform.iOS\EffectUtilities.cs:20 
  at Xamarin.Forms.Platform.iOS.PageRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00094] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Renderers\PageRenderer.cs:140 
  at Xamarin.Forms.Platform.iOS.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x00032] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Platform.cs:240 
  at Xamarin.Forms.Platform.iOS.NavigationRenderer.CreateViewControllerForPage (Xamarin.Forms.Page page) [0x00008] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Renderers\NavigationRenderer.cs:374 

  at Xamarin.Forms.Platform.iOS.NavigationRenderer.OnPushAsync (Xamarin.Forms.Page page, System.Boolean animated) [0x0001d] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Renderers\NavigationRenderer.cs:352 
  at Xamarin.Forms.Platform.iOS.NavigationRenderer.<ViewDidLoad>b__47_0 (Xamarin.Forms.Page p) [0x00024] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Renderers\NavigationRenderer.cs:239 
  at System.Runtime.CompilerServices.AsyncMethodBuilderCore+<>c.<ThrowAsync>b__7_0 (System.Object state) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1021 
  at Foundation.NSAsyncSynchronizationContextDispatcher.Apply () [0x00000] in /Users/builder/azdo/_work/1/s/xamarin-macios/src/Foundation/NSAction.cs:178 
  at (wrapper managed-to-native) UIKit.UIApplication.UIApplicationMain(int,string[],intptr,intptr)
  at UIKit.UIApplication.Main (System.String[] args, System.IntPtr principal, System.IntPtr delegate)
 [0x00005] in /Users/builder/azdo/_work/1/s/xamarin-macios/src/UIKit/UIApplication.cs:86 
  at UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x0000e] in /Users/builder/azdo/_work/1/s/xamarin-macios/src/UIKit/UIApplication.cs:65 
  at Mors.iOS.Application.Main (System.String[] args) [0x00001] in C:\Projects\DotNet\Mobile\Projeler\mors\Mors.iOS\Main.cs:17 

2021-10-05 16:27:52.415 Mors.iOS[537:108689] Unhandled managed exception: Object reference not set to an instance of an object (System.NullReferenceException)
  at Xamarin.CommunityToolkit.iOS.Effects.PlatformStatusBarEffect.UpdateStatusBarAppearance (UIKit.UIWindow window) [0x00000] in <cc58859ad7e942d9972e5172dfa7035a>:0 
  at Xamarin.CommunityToolkit.iOS.Effects.PlatformStatusBarEffect.UpdateStatusBarAppearance () [0x00033] in <cc58859ad7e942d9972e5172dfa7035a>:0 
  at Xamarin.CommunityToolkit.iOS.Effects.PlatformStatusBarEffect.SetColor (Xamarin.Forms.Color color) [0x000b3] in <cc58859ad7e942d9972e5172dfa7035a>:0 
  at Xamarin.CommunityToolkit.iOS.Effects.PlatformStatusBarEffect.OnAttached () [0x0000b] in <cc58859ad7e942d9972e5172dfa7035a>:0 
  at Xamarin.Forms.Effect.SendAttached () [0x00009] in D:\a\1\s\Xamarin.Forms.Core\Effect.cs:54 
  at Xamarin.Forms.RoutingEffect.SendAttached () [0x00000] in D:\a\1\s\Xamarin.Forms.Core\RoutingEffect.cs:29 
  at Xamarin.Forms.Element.AttachEffect (Xamarin.Forms.Effe
ct effect) [0x00045] in D:\a\1\s\Xamarin.Forms.Core\Element.cs:513 
  at Xamarin.Forms.Element.set_EffectControlProvider (Xamarin.Forms.IEffectControlProvider value) [0x0007c] in D:\a\1\s\Xamarin.Forms.Core\Element.cs:238 
  at Xamarin.Forms.Platform.iOS.EffectUtilities.RegisterEffectControlProvider (Xamarin.Forms.IEffectControlProvider self, Xamarin.Forms.IElementController oldElement, Xamarin.Forms.IElementController newElement) [0x0001a] in D:\a\1\s\Xamarin.Forms.Platform.iOS\EffectUtilities.cs:20 
  at Xamarin.Forms.Platform.iOS.PageRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00094] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Renderers\PageRenderer.cs:140 
  at Xamarin.Forms.Platform.iOS.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x00032] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Platform.cs:240 
  at Xamarin.Forms.Platform.iOS.NavigationRenderer.CreateViewControllerForPage (Xamarin.Forms.Page page) [0x00008] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Renderers\NavigationRenderer.
cs:374 
  at Xamarin.Forms.Platform.iOS.NavigationRenderer.OnPushAsync (Xamarin.Forms.Page page, System.Boolean animated) [0x0001d] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Renderers\NavigationRenderer.cs:352 
  at Xamarin.Forms.Platform.iOS.NavigationRenderer.<ViewDidLoad>b__47_0 (Xamarin.Forms.Page p) [0x00024] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Renderers\NavigationRenderer.cs:239 
  at System.Runtime.CompilerServices.AsyncMethodBuilderCore+<>c.<ThrowAsync>b__7_0 (System.Object state) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1021 
  at Foundation.NSAsyncSynchronizationContextDispatcher.Apply () [0x00000] in /Users/builder/azdo/_work/1/s/xamarin-macios/src/Foundation/NSAction.cs:178 
  at (wrapper managed-to-native) UIKit.UIApplication.UIApplicationMain(int,string[],intptr,intptr)
  at UIKit.UIApplication.Main (System.String[] args, System.IntPtr principal, System.IntPtr d
elegate) [0x00005] in /Users/builder/azdo/_work/1/s/xamarin-macios/src/UIKit/UIApplication.cs:86 
  at UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x0000e] in /Users/builder/azdo/_work/1/s/xamarin-macios/src/UIKit/UIApplication.cs:65 
  at Mors.iOS.Application.Main (System.String[] args) [0x00001] in C:\Projects\DotNet\Mobile\Projeler\mors\Mors.iOS\Main.cs:17 

`

[kerberosargos]

Hello I have updated XCT to 2.0.1 but this bug still is here.

[bijington]

To confirm this issue occurs on older iOS versions (12) but not on newer ones? It sounds like whatever API is being used might not be available on the older version. We should crash though just guard around the usage.