We're excited to announce our fourth preview release for .NET 9!

Note: these are the base SDKs that add support for the platforms in question. For MAUI (which is built on top of our SDKs), visit: https://learn.microsoft.com/dotnet/maui/.

This release consists of the following versions:

• iOS: 17.2.9523-net9-p4
• tvOS: 17.2.9523-net9-p4
• Mac Catalyst: 17.2.9523-net9-p4
• macOS: 14.2.9523-net9-p4

Full release notes: .NET 9 release notes
Known issues: Known issues in .NET 9

What's Changed

• [AppKit] Create a better binding for [NSEvent eventWithGCEvent:]. by @rolfbjarne in #20362
• [AppKit] Provide an NSEvent.GetCGEventObject method. by @rolfbjarne in #20423
• [AudioToolbox] Add correct trimmer annotations for AudioQueue.GetProperty. by @rolfbjarne in #20363
• [AVFoundation] Fix delegate signature for AVAudioSourceNode callbacks. by @rolfbjarne in #20357
• [bgen] Generate xml documentation for the generated ClassHandle property. by @rolfbjarne in #20425
• [bgen] Generate xml documentation for the generated constructors every NSObject subclass gets. by @rolfbjarne in #20436
• [bgen] Provide correct initialization for AudioBuffers. by @rolfbjarne in #20356
• [CGEvent] Use CGEventCreateScrollWheelEvent2 instead of CGEventCreateScrollWheelEvent. Fixes #13121. by @rolfbjarne in #20361
• [CoreGraphics] Bind CGEventPostToPid. by @rolfbjarne in #20365
• [CoreGraphics] Bind CGEventSetIntegerValueField and CGEventSetDoubleValueField. Fixes #12650. by @rolfbjarne in #20424
• [CoreGraphics] Bind CGEventTapCreateForPid and misc other improvements. by @rolfbjarne in #20404
• [CoreGraphics] Most of CoreGraphics is available in all versions of Mac Catalyst, so mark as such. by @rolfbjarne in #20369
• [CoreMedia] Make the remaining P/Invokes in have blittable signatures. by @rolfbjarne in #20360
• [CoreMidi] Remove unused delegates. by @rolfbjarne in #20378
• [CoreServices] Make P/Invokes have blittable signatures. by @rolfbjarne in #20408
• [CoreText] Make P/Invokes in CTFont have blittable signatures. by @rolfbjarne in #20418
• [CoreText] Make P/Invokes in CTFontDescriptor, CTFramesetter and CTParagraphStyle have blittable signatures. by @rolfbjarne in #20426
• [CoreText] Make P/Invokes in CTFontManager have blittable signatures. by @rolfbjarne in #20464
• [CoreText] Make P/Invokes in CTRunDelegate have blittable signatures. by @rolfbjarne in #20461
• [CoreWlan] Make P/Invokes have blittable signatures. by @rolfbjarne in #20465
• [docs] Bring back documentation updates from the documentation repository. by @rolfbjarne in #20453
• [docs] Stop using the term 'Xamarin'. by @rolfbjarne in #20451
• [dotnet] Add support for linking with Swift system libraries. Fixes #18848. by @rolfbjarne in #20463
• [dotnet] Automatically link with the Security framework. Fixes #20406. by @rolfbjarne in #20413
• [dotnet] Compute _SdkIsSimulator and the trimmer configuration earlier in the build. by @rolfbjarne in #20431
• [dotnet] Compute relative paths using absolute paths. by @rolfbjarne in #20374
• [dotnet] Embrace trimming. by @rolfbjarne in #20354
• [dotnet] Fix dependencies for Microsoft..Sdk.DefaultItems.props. by @rolfbjarne in #20478
• [GameController] Bind GCVirtualControllerConfiguration.Hidden. Fixes #20389. by @rolfbjarne in #20401
• [GameplayKit] Remove the bindings for GKHybridStrategist. by @rolfbjarne in #20468
• [msbuild] Add more diagnostic output to FindItemWithLogicalName. by @rolfbjarne in #20376
• [msbuild] Use the fully resolved path when computing the relative path for the LogicalName property. Fixes #20330. by @rolfbjarne in #20364
• [ObjCRuntime] Fix string comparison to be ordinal. by @rolfbjarne in #20377
• [src] Fix making all warnings errors. by @rolfbjarne in #20422
• [src] Remove EventArgs attribute on a category method. by @rolfbjarne in #20346
• [src] Stop generating CGPoint, CGRect and CGSize from a t4 file. by @rolfbjarne in #20432
• [SystemConfiguration] Make P/Invokes have blittable signatures. by @rolfbjarne in #20370
• Apple Privacy Manifest doc updates by @mcumming in #20391

Full Changelog: dotnet-9.0.1xx-preview3-9433...dotnet-9.0.1xx-preview4-9523