xamarin-macios | Bridges the worlds of .NET with the native APIs of macOS | iOS library

I keep getting error "Xamarin.iOS versions mismatch"

The Xamarin.iOS SDK version '14.20.0.24' that is installed on the Mac is not compatible with this version of Visual Studio. Would you like us to install Xamarin.iOS '14.20.0.25' for you? This will overwrite any other existing Xamarin.iOS installation on your Mac.

Microsoft Visual Studio Enterprise 2019 Version 16.11.1

The problem is that I do understand the problem, but cannot download version 14.20.0.25 since it doesn't exist! The latest Xamarin.iOS (as of today 2021-08-17) is Xamarin.iOS 14.20.0.24

Releases

Am I missing something? Where do I download 14.20.0.25? Normally, VS downloads this automatically, when it is a mismatch, but not this time.

I created a ToolbaItems in a ContentPage that is a ShellContent from FlyoutItem - I am using ShellApp.

After updating our iOS build server from Mac OS Catalina to Big Sur our GitLab pipelines (running cakebuild) are failing with some cryptic Xamarin specific error message for one specific project (meaning other Xamarin iOS projects are building successfully and passing the pipeline).

However checking out the exact same project (same commit, same everything) on a different Big Sur machine the project in question compiles with no errors. Note that even commits that passed previously are now failing the pipeline.

Here's the interesting part of the logs

SIGABRT: Cannot access a disposed object. Object name: 'SKGLView'.

We are using SKGLView in MainPage, sometimes back from another view, this error will show and app crash. I have no idea, and here is the log from App Center.

NSObject.get_SuperHandle () /Users/builder/azdo/_work/1/s/xamarin-macios/src/Foundation/NSObject2.cs:471 GLKView.Display () /Users/builder/azdo/_work/1/s/xamarin-macios/src/build/ios/native/GLKit/GLKView.g.cs:152 SKGLViewRenderer+<>c__DisplayClass4_0.b__1 () NSAsyncActionDispatcher.Apply () /Users/builder/azdo/_work/1/s/xamarin-macios/src/Foundation/NSAction.cs:152 (wrapper managed-to-native) UIKit.UIApplication.UIApplicationMain(int,string[],intptr,intptr) UIApplication.Main (System.String[] args, System.IntPtr principal, System.IntPtr delegate) /Users/builder/azdo/_work/1/s/xamarin-macios/src/UIKit/UIApplication.cs:86 Application.Main (System.String[] args)

I am building a Xamarin Forms controls library for internal use and I am attempting to define a DataTemplate as a bindable property that gets passed and set to a CollectionView via a ViewModel. When I do this I get a NRE deep within the Xamarin Forms unmanaged code and I get no specifics on that is causing the NRE within the caught exception. So it makes me wonder if this is even possible to do. All the examples I have found online all set the ItemTemplate directly, never is it a bound property. So, is this a doable thing?

This is where the exception occurs in the Xamarin.Forms code

I've recently changed my projects to use .NET core 2 and I'm currently re-testing WPF, Android and iOS.

Unfortunately I've also been upgrading my Nugets to get the UWP project working and Xcode was updated this morning too to Version 12.0 (12A7209), followed by Visual Studio for Mac, so I'm not quite sure what to blame as-yet.

I did have problems with App Center not wanting to upgrade from 3.4.1 to 3.4.2, so I resorted to clearing my Nuget cache and editing the project solutions manually, now they're all pointing to 3.4.2 (latest as of 23rd September 2020).

The following error seems to be the root cause, but I don't understand what I need to do to resolve it?

Visual Studio 2019 - Windows Xamarin Forms v4.60800

I am getting the following error when compiling my iOS Project

Severity Code Description Project File Line Suppression State Error System.IO.FileNotFoundException: Could not find file

I have a build issue with a Xamarin.iOS app in Azure DevOps that I haven't been able to solve. I'm wondering if anyone has any suggestions.

Building the iOS version of the app works locally in VS for Mac but fails in Azure due to this error:

MTOUCH : error MT2002: Failed to resolve "System.Drawing.Color" reference from "System.Drawing.Common, Version=4.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51" [/Users/runner/runners/2.164.6/work/1/s/iOS/CatRentalStore.iOS.csproj]

I was having a similar issue with the Android build. I resolved it by switching from the macOS-10.14 hosted build agent to the windows-2019 agent, but that isn't an option with the iOS app.

I've updated packages that may use System.Drawing.Color to the latest stable releases - Acr.UserDialogs, BTProgressHUD, Splat, and Xamarin.Essentials.

I searched the solution source and did not find any direct references to the System.Drawing.Color class.

I also tried specifying the version of Xamarin/Mono to use in the build to match my local version using sudo $AGENT_HOMEDIRECTORY/scripts/select-xamarin-sdk.sh 6_4_0. That caused a different error to occur: