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Xamarin.iOS 12.0 Release Notes

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Requirements

  • The latest features and APIs require Xcode 10 GM and the bundled iOS, tvOS and watchOS SDKs
  • Apple Xcode 10 requires a Mac running OSX 10.13.6 (High Sierra) or newer

What's New in this Release

Support for Xcode 10

For more information you can consult the Xcode 10 release notes from Apple.

Support for iOS 12

The following new frameworks were added in iOS 12:

  • AuthenticationServices
  • CarPlay
  • IdentityLookup
  • IdentityLookupUI
  • NaturalLanguage
  • Network

Most other frameworks were also updated, including ARKit 2.0 and Siri (Intents) shortcuts. See our API diff to browse the newest API.

For more information you can consult the iOS 12 release notes from Apple.

Support for tvOS 12

The following new frameworks were added in tvOS 12:

  • NaturalLanguage
  • Network
  • TVUIKit

Most other frameworks were also updated. See our [API diff](#api-diff to browse the newest API.

For more information you can consult the tvOS 12 release notes from Apple.

Support for watchOS 5

The following new frameworks were added in watchOS 5:

  • NaturalLanguage

Most other frameworks were also updated. See our API diff to browse the newest API.

For more information you can consult the watchOS 5 release notes from Apple.

Other Changes

The GC pump thread used on simulator builds is now disabled by default. This feature was added, a long time ago, to help diagnose object instances without managed references, where the GC could collect them and cause randomly occurring, hard to diagnose crashes. However it can cause issues when debugging applications. Since several changes over the years made this option less useful it is now disabled and, if needed, can be re-enabled by adding --debugtrack:true to the mtouch additional arguments of your project's options.

Release History

This version of Xamarin.iOS correspond to our xcode10 milestone and is based of the stable 15.8 release.

  • September 19, 2018 - Xamarin.iOS 12.0.0.15
  • September 11, 2018 - Xamarin.iOS 12.0.0.10

Earlier release notes, for Xamarin.iOS previews for Xcode 10 betas, are located in Xamarin.iOS 11.99.

September 19, 2018 - Xamarin.iOS 12.0.0.15

This release is based on the Xcode 10 final release.

Issue Fixed

  • 4818 - [clockkit] Add missing 'CLKComplicationFamily' enum values

September 11, 2018 - Xamarin.iOS 12.0.0.10

This release is based on the Xcode 10 GM seed.

Known Issues

64 bits watchOS support

  • Xcode 10 GM added support for 64 bits watch application, aka arm64_32. The current app store submission process requires this architecture to be included in your application when including watch support. You can workaround this with [https://github.com/xamarin/xamarin-macios/issues/4810#issuecomment-421338365](these instructions).

  • Trying to run a watch app on the new Series 4 Apple Watch will fail with this error:

    IncorrectArchitecture: Failed to find matching arch for 32-bit Mach-O input file ...
error MT1006: Could not install the application 'MyTestApp.app' on the device 'MyDevice': AMDeviceSecureInstallApplicationBundle returned: 0xe8000087 (kAMDIncorrectArchitectureError).

    This is because the S4 device can only execute native arm64_32 code, not armv7k like previous watches.

    Please read https://github.com/xamarin/xamarin-macios/issues/4864 for more information and a workaround.

Apple Breaking Changes

  • Apple removed support for stdlibc++. Using C++ code now requires the use of libc++.
  • Apple removed support to build watchOS 1.x applications.
  • rdar://41123682 Apple changed TVElementUpdateType* enum values. Please test your application if you're usinf this type.
  • rdar://43425168 Apple changed IN*WorkoutIntentResponseCode enum values. Please test your application if you're usinf this type.

Apple Non-Breaking Issues

  • Apple deprecated OpenGLES and related API in favor of Metal.
  • rdar://41135211 RPBroadcastPickerView symbol is not present in simulator. If needed you'll need to test this on devices.

32bits limitations

  • Disabling the managed linker for device builds can generate object files that are too big for the 32bits native linker ld to process properly. The workaround is to enable the managed linker (e.g. Link SDK) on your projects.

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).

API Diff

The following documents contains a complete list of the API changes since the Xamarin.iOS 11.14 stable release:

Feedback welcome

Your feedback is important to us. If there are any problems with this release, check the Xamarin.iOS Forums and Github Issues 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: