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Architecture Changes in iOS 11

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One of the biggest changes that you should be aware of with iOS 11 is the deprecation of 32-bit support for apps, as detailed in Apple's press release. All new apps and updates to existing apps must support 64-bit. 32-bit apps will not launch in iOS 11.

To update your app in Visual Studio for Mac, use the following steps:

  1. Right-click on the project name to open Project Options.

  2. Browse to the iOS Build tab.

  3. Set the Supported architectures drop-down to x86_64 for the Debug|iPhoneSimulator and Release|iPhoneSimulator:

    Change Simulator architectures drop-down

  4. For iOS devices, change the configuration to Debug|iPhone and set the Supported architectures drop-down to ARM64:

    Change device architectures drop-down

  5. Change the configuration to Release|iPhone and set the Supported architectures drop-down to ARM64.

For more information on 32-bit and 64-bit architectures, see the 32/64 bit Platform Considerations guide.