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

[Copilot]

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: #[issue_number]
• Apple Documentation: UIGraphicsImageRenderer
• Suggested by @rolfbjarne

Fixes #24053.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Crash: UIKit - UIScreen - Capture: UIGraphicsBeginImageContext() failed to allocate CGBitampContext</issue_title>
<issue_description>### Apple platform

iOS

Framework version

net9.0-*

Affected platform version

VSCode on mac; .net9 maui 9.0.110

Description

every few days i get a crash from customers of my App that reads like this:

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.
Native stack trace:
	0   CoreFoundation                      0x000000018ef55de8 2744BAE5-E258-3D88-B1E7-17A118109A6F + 1113576
	1   libobjc.A.dylib                     0x000000018c6e1d8c objc_exception_throw + 72
	2   Foundation                          0x000000018e2b36c8 519FF073-0591-3EF4-8FE1-4AA7226AC834 + 7268040
	3   UIKitCore                           0x00000001917e8704 A6B14CA2-D4B7-3636-96A8-2280A3954EF4 + 2746116
	4   mycompany.myapp.ios                   0x0000000103582198 wrapper_managed_to_native_UIKit_UIGraphics_BeginImageContextWithOptions_CoreGraphics_CGSize_byte_System_Runtime_InteropServices_NFloat + 168
	5   mycompany.myapp.ios                   0x0000000106e61ac8 Microsoft_iOS_UIKit_UIScreen_Capture + 1196
	6   mycompany.myapp.ios                   0x0000000102e3c328 DATAflor_Common_iOS_DependencyService_DFiOSScreenshotService_TakeScreenshot_object + 88
	7   mycompany.myapp.ios                   0x000000010419d298 DATAflor_Time_iOS_DATAflor_Time_iOS_CustomUIApplication__c__DisplayClass8_0__OnDisplayTouchb__0 + 88
	8   mycompany.myapp.ios                   0x00000001071e3ae8 -[CustomUIApplication sendEvent:] + 48

we are doing screenshots in our app for Hotline-Service-purposes.
now with maui is see these crashes (didn't find such crashes with the old xamarin app but i think it was build with an older XCode too)

When i look at the code here on github (UIKit/UIScreen - Capture) is see this:

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 ();
			}
		}

As far as i'm aware, BeginImageContextWithOptions is obsolete / deprecated?! wasn't that documented somewhere at apple and discussed in some maui-issue-threads? :)

so i wonder if this could be changed here and if this would fix that crash?
Or if someone could tell me why it ISN'T changed here?

Thanks a lot

Steps to Reproduce

don't know - write an app that calls ".Capture()" in the iOS-Part of a maui app running on iOS (iPad, iPhone)? It doesn't happen every time but i see it every few days when my customers are reporting it.

Did you find any workaround?

not yet

Relevant logs

see issue with the log inside</issue_description>

<agent_instructions>The Capture method should be updated, and there are two versions:

• macios/src/UIKit/UIScreen.cs

  Lines 42 to 83 in c7579d1

  	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 ();
  	}
  	}
  	}

• macios/src/UIKit/UIView.cs

  Lines 253 to 265 in c7579d1

  	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);
  	DrawViewHierarchy (bounds, afterScreenUpdates);
  	snapshot = UIGraphics.GetImageFromCurrentImageContext ();
  	} finally {
  	UIGraphics.EndImageContext ();
  	}
  	return snapshot;
  	}

Update both to use my suggestion from my first comment in this issue.</agent_instructions>

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

@rolfbjarne This is completely untested, but can you try this and see if it works for you?

public UIImage Capture ()
{
	var view = UIApplication.SharedApplication.KeyWindow;
	using var renderer = new UIGraphicsImageRenderer (size);
	return renderer.CreateImage ((context) => {
		view.DrawViewHier...

</details>

Fixes dotnet/macios#24053

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• tvOS: vsdrops gist ( No breaking changes )
• MacCatalyst: vsdrops gist ( No breaking changes )
• macOS: vsdrops gist ( No breaking changes )

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• iOS: vsdrops gist ( No breaking changes )
• tvOS: vsdrops gist ( No breaking changes )
• MacCatalyst: vsdrops gist ( No breaking changes )
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✅ cecil: All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (iOS): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (MacCatalyst): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (macOS): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (Multiple platforms): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (tvOS): All 1 tests passed. Html Report (VSDrops) Download
✅ framework: All 2 tests passed. Html Report (VSDrops) Download
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✅ interdependent-binding-projects: All 4 tests passed. Html Report (VSDrops) Download
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✅ linker: All 44 tests passed. Html Report (VSDrops) Download
✅ monotouch (iOS): All 8 tests passed. Html Report (VSDrops) Download
✅ monotouch (MacCatalyst): All 11 tests passed. Html Report (VSDrops) Download
✅ monotouch (macOS): All 9 tests passed. Html Report (VSDrops) Download
✅ monotouch (tvOS): All 8 tests passed. [attempt 2] Html Report (VSDrops) Download
✅ msbuild: All 2 tests passed. Html Report (VSDrops) Download
✅ windows: All 3 tests passed. Html Report (VSDrops) Download
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✅ xtro: All 1 tests passed. Html Report (VSDrops) Download

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