Can't build Xamarin.ios with Xcode 15.1 and SDK 17

[victorbeltranpinol]

Describe the solution you'd like
I would like to build the iOS Xamarin Forms using Xamarin.iOS 16.4 and Xcode 15.0.1 Preview

Additional context
When I try to build my app in the App Center using:
SDK version: Xamarin.iOS 16.4
Xcode version: 15.0.1 Preview

I have many errors like this:

/Users/runner/work/1/s/MyProject/obj/iPhone/Release/netstandard2.0/.NETStandard,Version=v2.0.AssemblyAttributes.cs(4,20): error CS0400: The type or namespace name 'System' could not be found in the global namespace (are you missing an assembly reference?) [/Users/runner/work/1/s/MyProject/MyProject.csproj]
/Users/runner/work/1/s/MyProject/obj/iPhone/Release/netstandard2.0/MyProject.AssemblyInfo.cs(14,55): error CS0518: Predefined type 'System.String' is not defined or imported [/Users/runner/work/1/s/MyProject/MyProject.csproj]

However, if I run the build using:
SDK version: Xamarin.iOS 16.2
Xcode version: 14.2

It works like a charm

I received this email from Apple, therefore I must build the APP using SDK iOS 17 and Xcode 15

ITMS-90725: SDK version issue - This app was built with the iOS 16.2 SDK. Starting April 29, 2024, all iOS and iPadOS apps must be built with the iOS 17 SDK or later, included in Xcode 15 or later, in order to be uploaded to App Store Connect or submitted for distribution.

Is there something not ready in the ios build machines of the App Center? Does somebody have success using xcode 15?

Thanks in advance

[follesoe]

As a bare minimum, Microsoft should ensure AppCenter stays alive and supports the last Xamarin releases, preventing developers from having to waste time on yet a migration (from AppCenter to another build service), and rather can focus on migrating from Xamarin to MAUI.

[AngelAndresM]

Is there any update on this incident?

I also have this problem.

[victorbeltranpinol]

@AngelAndresM not yet. As a workaround I published the app building with a local mac

[follesoe]

One possible solution is to use pre-build scripts to try and install Xcode 15 and the latest Xamarin.iOS versions.

I have also submitted an issue for the macos-12 runner, which is what AppCenter uses, to get the latest Xamarin tools included: actions/runner-images#9512

[follesoe]

I used a similar work-around to install the latest version of Xamarin.Android, to build against Android 34. See comment in issue #2611 for the script.

[cjrvdev]

Honestly doubt there will be support in a long time. I personally raised a ticket in the past to support this and they had it planned for like 1 month later (And when I asked it was already way too late so...)

[EmmanVazz]

One possible solution is to use pre-build scripts to try and install Xcode 15 and the latest Xamarin.iOS versions.

I have also submitted an issue for the macos-12 runner, which is what AppCenter uses, to get the latest Xamarin tools included: actions/runner-images#9512

@follesoe Can you post the pre-build script you used here? I think many of us will need it. Thanks!

[follesoe]

@EmmanVazz I believe Xcode 15 is installed already. I have not done manual installs of Xamarin.iOS yet, but this is how I did it for Xamarin.Android:

#!/usr/bin/env bash
PKG_URL="https://dl.xamarin.com/MonoforAndroid/Mac/xamarin.android-13.2.2.0.pkg"
PKG_NAME=${PKG_URL##*/}
curl -4fsLo "${PKG_NAME}" "${PKG_URL}"
sudo installer -pkg "${PKG_NAME}" -target /

[noahcolvin]

Not sure the above pre-build script (modified for Xamarin.iOS) will work here. My build is already installing xamarin.ios-16.4.0.23.pkg and is using the macos-13 image, not 12 like stated above. I'm getting the same errors as OP so there might be more to it.

[AjitKRuin]

@victorbeltranpinol , how do you update Xamarin.iOS to 16.4 in cs proj or code level in Xamarin iOS project? do we need to change any package as for me I kept Xamarin.IOS as reference only how can we update?

[rafageist]

@AjitKRuin You don't need to change your project. Migrate to Github Actions with:

• Macos-14
• XCode 15.1
• Dotnet 6.0.x
• Xamarin.iOS using dotnet boots
• Download and get msbuild from visual studio for mac 17.6.x .dmg image
• Use mono and msbuild.dll to restore Nugets and build your .ipa
• Use your Github secrets to sign and publish with xcrun altool

happy hacking