Fix SKLottieView animation not starting when IsAnimationEnabled toggled before Window assignment

[Copilot]

SKLottieView with IsAnimationEnabled="False" in XAML cannot be re-enabled from code-behind. Setting IsAnimationEnabled = true appears to work but animation never runs.

Root Cause

When IsAnimationEnabled is set to true before the view has a Window:

1. UpdateIsAnimationEnabled() starts a 16ms timer
2. Timer callback immediately returns false (Window is null)
3. No handler exists to restart when Window is assigned later

Changes

SKAnimatedSurfaceView.shared.cs

• Add Window null check before starting timer in UpdateIsAnimationEnabled()
• Override OnPropertyChanged to restart animation when Window property changes

private void UpdateIsAnimationEnabled()
{
    if (!this.IsLoadedEx())
        return;
    
    if (Window is null)  // New check prevents premature timer start
        return;
    
    // ... existing timer start logic
}

protected override void OnPropertyChanged(string? propertyName = null)
{
    base.OnPropertyChanged(propertyName);
    
    if (propertyName == nameof(Window))
    {
        UpdateIsAnimationEnabled();  // Restart animation when added to Window
    }
}

This ensures animation starts correctly regardless of initialization order between IsAnimationEnabled and Window assignment.

Warning

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Original prompt

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This section details on the original issue you should resolve

<issue_title>[BUG] MAUI SKLottieView doesn't get enabled</issue_title>
<issue_description>Description

If you create a SKLottieView with IsAnimationEnabled="False", it won't get enabled even if you set IsAnimationEnabled="True" later from code behind.

Code

<skia:SKLottieView
  x:Name="animationView"
  Source="animation.json"
  HeightRequest="60"
  WidthRequest="60"
  Progress="0"
  IsAnimationEnabled="False"
  VerticalOptions="Center"
  HorizontalOptions="Center">

Expected Behavior

The animation status should be mutable. You should be able to set it to True/False to play/stop the animation. In Android works as expected.

Actual Behavior

In iOS once animation created with IsAnimationEnabled="False", won't play again even after setting IsAnimationEnabled="True" from code behind.

Basic Information

• Version with issue: SkiaSharp.Extended.UI.Maui 2.0.0 (Tried 3.0.0-preview.7 but my application just crashes)
• Last known good version: ?
• IDE: Microsoft Visual Studio 17.10.1
• Platform Target Frameworks:
  • Android: 28.0
  • iOS: 14.0
• Target Devices:
  • Device iPhone 15 Plus iOS 17.4
  • Simulator iPhone 15 Plus iOS 17.4
    </issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [BUG] MAUI SKLottieView doesn't get enabled #282

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