Xamarin.iOS : “Failed to compile the generated registrar code” on Visual Studio for Mac

by September 14, 2022

This content has 2 years. Some of the information in this post may be out of date or no longer work. Please, read this page keeping its age in your mind.If you have recently upgraded your XCode version to 14.0, and installed the XCode command line tools too, you will probably notice some error messages when trying to run your Xamarin.Forms, or iOS application from Visual Studio for Mac. What actually helped me, is this:Navigate to https://developer.apple.com/download/all/ and search for Command Line Tools for Xcode 13.4 and Xcode 13.4. Both downloads are big, the XCode itself around 10GB and the CL Tools are around 1GB, so definitely do not do this on metered connections. Once the downloads are ready, open the XCode.XP file with the Package Archiver, let it extract to downloads, then move it to Applications folder. After that, install CL tools. Follow the installer’s instructions. Boom, it’s solved. Issue reported at: https://github.com/xamarin/xamarin-macios/issues/15954

Xamarin 2

Xamarin Forms: White screen between page push and pop solved

by October 6, 2021

This content has 3 years. Some of the information in this post may be out of date or no longer work. Please, read this page keeping its age in your mind.If you are experiencing white screen when pushing to Navigation or Modal stack on Android, read on. I’m not sure is this a bug in Xamarin Forms or not, but I guess this is, because it comes only in certain scenarios, and not always. What is happening, how do you notice this error? You have got a NavigationPage. You are pushing a new page to the navigationstack, and the page is not getting rendered, only a blank white screen displays. If you are rotating the device, the page is getting rendered well. My environment was:Xamarin.Forms: 4.8 up to 5.0Device: Samsung Galaxy A12Visual Studio 2019 Professional with Xamarin.Android SDK 11.4.0.5 Solution Always invoke the INavigation’s methods on the applications Main Thread. UI changes must go always on the UI thread of the application. Create a class which wraps the INavigation presented by your Views. It’s handy to store a reference in this class to the Applications Current MainPage’s INavigation instance, so try to build your code to supply the actual INavigation Instance every time to this class when the application’s mainpage is set. Remarks Consider a check for the current thread in the methods body. If they are being executed in the main thread, you won’t need to switch to the main again. Bug is reported on Github: https://github.com/xamarin/Xamarin.Forms/issues/11993

Xamarin 5

Xamarin.Android: R.java error APT2258 invalid symbol name fix

by April 16, 2021

This content has 4 years. Some of the information in this post may be out of date or no longer work. Please, read this page keeping its age in your mind.If you are facing this issue: You should check for your Resources folder, and look for files with name like a C# or Java keyword. For example: new, public, private, static, class, and so on. If you rename the file, it will solve your problem.

Android, Xamarin 0

Xamarin.Android: Missing aapt.exe

by March 3, 2021

This content has 4 years. Some of the information in this post may be out of date or no longer work. Please, read this page keeping its age in your mind.When trying to deploy an application to simulator or device, Visual Studio gives the following error: To solve this problem you sould go to Visual Studio’s Tools then Android and select SDK Manager option. It will give an error dialog, that the SDK tool files are corrupted. Click repair. The mentioned batch command in the error message is deprecated by the way.

Android, Xamarin 0