Xamarin.iOS 11.9 Release Notes

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This version of Xamarin.iOS corresponds to our xcode9.3 (xcode9.3) milestone. This is based on our stable d15-6 milestone, i.e. Xamarin.iOS 11.8.x.


  • The latest features and API requires Xcode 9.3 and the bundled iOS, tvOS and watchOS SDKs;
  • Apple Xcode 9.3 requires a Mac running OSX 10.13.2 (High Sierra) or newer;

What's New in this Release

Support for Xcode 9.3

The SDK tooling has been updated to

  • Support the new OS from simulators: iOS 11.3, tvOS 11.3 and watchOS 4.3;
  • Support launching to devices;

Additional API

There were very few changes in the SDK but it's worth mentioning:

  • an improved ARKit version 1.5; and
  • a new BusinessChat framework for both iOS and macOS.

Release History

  • April 2, 2018 - Xamarin.iOS
  • March 9, 2018 - Xamarin.iOS
  • February 15, 2018 - Xamarin.iOS

You can learn more about how we ship our releases in the Visual Studio 2017 Release Rhythm document.

April 2, 2018 - Xamarin.iOS

This is the initial, stable release with support for Xcode 9.3. There were no late API change in the final release of Xcode 9.3. This version includes all the fixes from the recently released 11.8 service release 3.

March 9, 2018 - Xamarin.iOS

This version is available as a web preview. It is the successor of the 11.6.99.x releases which were based on our earlier stable (15.5) release.

Bindings for the new BusinessChat framework are now available along API additions in beta 3 and 4.

February 15, 2018 - Xamarin.iOS

This version is available as a web preview. It will work correctly with the current stable Visual Studio for Mac (7.3) and Visual Studio 2017 (15.5) on Windows.

Known Issues

Using an older Xcode version

Using an older Xcode version (than the one mentioned in the above requirements) is often possible, but some features may not be available. Also, some limitations might require workarounds, e.g.:

  • The static registrar requires Xcode headers files to build applications, leading to MT0091 or MT4109 errors if API are missing. In most cases enabling the managed linker will help (by removing the API).
  • Bitcode builds (for tvOS and watchOS) can fail submission to the App Store unless an Xcode 9.0+ toolchain is used.

MetalPerformanceShaders Bindings

Changes introduced to MPS in Xcode 9.3 are marked as experimental, we will wait for Apple to make the API stable before binding them so we do not introduce unnecessary breaking changes later.


Your feedback is important to us. If there are any problems with this release, check the Xamarin.iOS Forums and Xamarin Mac/iOS Github Repository for existing issues. If you do not find any matching issue, please feel free to start a new discussion and report an issue.

Open Source

Xamarin.iOS is based on the following open-source repositories: