[UIKit] Fix crash in UIScreen.Capture() and UIView.Capture() by replacing deprecated UIGraphicsBeginImageContextWithOptions with UIGraphicsImageRenderer. Fixes #24053. (#24054)

## Problem

Customers were experiencing crashes when taking screenshots in iOS apps with the following error:

```
Objective-C exception thrown. Name: NSInternalInconsistencyException 
Reason: UIGraphicsBeginImageContext() failed to allocate CGBitampContext: size={1080, 810}, scale=2.000000, bitmapInfo=0x2006. 
Use UIGraphicsImageRenderer to avoid this assert.
```

The crash was occurring in both `UIScreen.Capture()` and `UIView.Capture()` methods, which were using the deprecated `UIGraphicsBeginImageContextWithOptions` API. Apple explicitly recommends using `UIGraphicsImageRenderer` instead to avoid these allocation failures.

## Solution

Replaced the deprecated `UIGraphicsBeginImageContextWithOptions` API with the modern `UIGraphicsImageRenderer` API in both affected methods:

### UIScreen.Capture()

- Removed legacy iOS version checks and fallback code paths
- Simplified from ~40 lines to a clean 9-line implementation
- Now uses `UIGraphicsImageRenderer` to capture the KeyWindow

### UIView.Capture(bool afterScreenUpdates)

- Replaced try-finally block with using statement for `UIGraphicsImageRenderer`
- Maintained the `afterScreenUpdates` parameter functionality
- Cleaner, more maintainable code

## Benefits

- ✅ Eliminates the CGBitmapContext allocation crash reported by users
- ✅ Uses Apple's recommended modern API (available on all supported iOS versions)
- ✅ Simplifies code by removing legacy version checks
- ✅ More robust and efficient image rendering
- ✅ Follows Apple's guidelines from the error message itself

## References

- Issue: #24053
- Apple Documentation: [UIGraphicsImageRenderer](https://developer.apple.com/documentation/uikit/uigraphicsimagerenderer)
- Suggested by @rolfbjarne

Fixes #24053.

---------

Co-authored-by: rolfbjarne <[email protected]>

Author: Copilot

src/UIKit/UIScreen.cs

@@ -41,44 +41,13 @@ public CoreAnimation.CADisplayLink CreateDisplayLink (Action action)
 		/// </remarks>
 		public UIImage Capture ()
 		{
-			if (SystemVersion.CheckiOS (7, 0)) {
-				// This is from https://developer.apple.com/library/content/qa/qa1817/_index.html
-				try {
-					var view = UIApplication.SharedApplication.KeyWindow;
-					UIGraphics.BeginImageContextWithOptions (view.Bounds.Size, view.Opaque, 0);
-					view.DrawViewHierarchy (view.Bounds, true);
-					return UIGraphics.GetImageFromCurrentImageContext ();
-				} finally {
-					UIGraphics.EndImageContext ();
-				}
-			}
-
-			// This is from: https://developer.apple.com/library/ios/#qa/qa2010/qa1703.html
-			var selScreen = new Selector ("screen");
-			var size = Bounds.Size;
-
-			UIGraphics.BeginImageContextWithOptions (size, false, 0);
-
-			try {
-				var context = UIGraphics.GetCurrentContext ();
-
-				foreach (var window in UIApplication.SharedApplication.Windows) {
-					if (window.RespondsToSelector (selScreen) && window.Screen != this)
-						continue;
-
-					context.SaveState ();
-					context.TranslateCTM (window.Center.X, window.Center.Y);
-					context.ConcatCTM (window.Transform);
-					context.TranslateCTM (-window.Bounds.Size.Width * window.Layer.AnchorPoint.X, -window.Bounds.Size.Height * window.Layer.AnchorPoint.Y);
-
-					window.Layer.RenderInContext (context);
-					context.RestoreState ();
-				}
-
-				return UIGraphics.GetImageFromCurrentImageContext ();
-			} finally {
-				UIGraphics.EndImageContext ();
-			}
+			// This is from https://developer.apple.com/library/content/qa/qa1817/_index.html
+			// Updated to use UIGraphicsImageRenderer to avoid deprecated UIGraphicsBeginImageContextWithOptions
+			var view = UIApplication.SharedApplication.KeyWindow;
+			using var renderer = new UIGraphicsImageRenderer (view.Bounds.Size);
+			return renderer.CreateImage ((context) => {
+				view.DrawViewHierarchy (view.Bounds, true);
+			});
 		}
 	}
 }

src/UIKit/UIView.cs

@@ -252,16 +252,11 @@ public static Task<bool> AnimateAsync (double duration, Action animation)
 		///         </remarks>
 		public UIImage Capture (bool afterScreenUpdates = true)
 		{
-			UIImage snapshot;
 			var bounds = Bounds; // try to access objc the smalles amount of times.
-			try {
-				UIGraphics.BeginImageContextWithOptions (bounds.Size, Opaque, 0.0f);
+			using var renderer = new UIGraphicsImageRenderer (bounds.Size);
+			return renderer.CreateImage ((context) => {
 				DrawViewHierarchy (bounds, afterScreenUpdates);
-				snapshot = UIGraphics.GetImageFromCurrentImageContext ();
-			} finally {
-				UIGraphics.EndImageContext ();
-			}
-			return snapshot;
+			});
 		}
 
 		#region Inlined from the UITraitChangeObservable protocol