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How do I build my .NET 8 MAUI iOS app using Xcode 15 in Azure DevOps?

When building my .NET 8 iOS MAUI app in an Azure DevOps build pipeline, it complains that I’m not using the latest Xcode.

        
ILLink : iOS error IL7000: An error occured while executing the custom linker steps. Please review the build log for more information. [/Users/runner/work/1/s/MyProject/MyProject.csproj::TargetFramework=net8.0-iOS]
/Users/builder/azdo/_work/1/s/xamarin-macios/src/build/dotnet/ios/generated-sources/UIKit/UIApplication.g.cs(95): error MT4162: The type 'UIKit.UISceneSessionActivationRequest' (used as a parameter in UIKit.UIApplication.ActivateSceneSession) is not available in iOS 16.4 (it was introduced in iOS 17.0). Please build with a newer iOS SDK (usually done by using the most recent version of Xcode). [/Users/runner/work/1/s/MyProject/MyProject.csproj::TargetFramework=net8.0-iOS]
        
ILLINK : error MT2362: The linker step 'Registrar' failed during processing: The type 'UIKit.UISceneSessionActivationRequest' (used as a parameter in UIKit.UIApplication.ActivateSceneSession) is not available in iOS 16.4 (it was introduced in iOS 17.0). Please build with a newer iOS SDK (usually done by using the most recent version of Xcode). [/Users/runner/work/1/s/MyProject/MyProject.csproj::TargetFramework=net8.0-iOS]

I’ve set up my build pipeline to use macos-latest but Xcode 15 does not appear to be installed.

Note: I ran into this problem at work and have resolved it, so I’ll include my answer below.

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2

Answers


  1. Chosen as BEST ANSWER
    0

    As of December 2023, the macos-latest image is Mac OS 12. The list of build agents along with their image names is documented here

    Quick screen snip of the relevant image names here: enter image description here

    Step 1 - Use the actual latest image macos-13

    It's in preview as of right now, but it has latest versions of Xcode (15.0 and 15.0.1) installed.

    pool:
  vmImage: "macos-13"

    Step 2 - Select Xcode version

    I have some yaml in my build pipeline that lists out relevant information and selects the latest version of Xcode that I want to use.

      - script: |
     echo Mac OS version:
     sw_vers -productVersion
     echo
     echo Installed Xcode versions:
     ls /Applications | grep 'Xcode'
     echo
     echo currently selected xcode:
     xcrun xcode-select --print-path
     echo
     echo selecting latest xcode...
     sudo xcode-select -s /Applications/Xcode_15.0.1.app
     xcrun xcode-select --print-path
     xcodebuild -version
    displayName: Select Xcode Version

    Example output:

    Starting: Select Xcode Version
==============================================================================
Task         : Command line
Description  : Run a command line script using Bash on Linux and macOS and cmd.exe on Windows
Version      : 2.231.0
Author       : Microsoft Corporation
Help         : https://docs.microsoft.com/azure/devops/pipelines/tasks/utility/command-line
==============================================================================
Generating script.
========================== Starting Command Output ===========================
/bin/bash --noprofile --norc /Users/runner/work/_temp/bb313650-3256-4f80-b567-0ec926cb9c07.sh
Mac OS version:
13.6

Installed Xcode versions:
Xcode.app
Xcode_14.1.0.app
Xcode_14.1.app
Xcode_14.2.0.app
Xcode_14.2.app
Xcode_14.3.1.app
Xcode_14.3.app
Xcode_15.0.1.app
Xcode_15.0.app

currently selected xcode:
/Applications/Xcode_14.3.1.app/Contents/Developer

selecting latest xcode...
/Applications/Xcode_15.0.1.app/Contents/Developer
Xcode 15.0.1
Build version 15A507
Finishing: Select Xcode Version

  2. 0

    This solution effectively ensures that the correct Xcode version 15.0.1 is used during the build process, allowing your .NET 8 iOS MAUI app to compile without encountering errors related to unavailable types from older iOS SDKs.

    trigger:
  branches:
    include:
      - develop

variables:
    BuildConfiguration: Release
    DotNetVersion: 8.x
    iOSVersion: net8.0-ios

pool:
  vmImage: "macos-13"
  demands: xcode

steps:
- task: PowerShell@2
  displayName: Select Xcode Version
  inputs:
    targetType: 'inline'
    script: |
      sudo xcode-select -s /Applications/Xcode_15.0.1.app
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