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Using Xamarin.Forms, Visual Studio 2017 on a PC, and MacBook Air for building the mobile application to iOS.
Yesterday, I updated the Visual Studio version to 15.3.5. I also updated the MacBook Air (via VS for Mac) to get the latest version of iOS (11.0). I created a new app (Xamarin.Forms) just to test the update and everything worked as expected.
I tried to run an older app that I was developing previously, and I wasn't able to run it on the Mac.
I got the following error:
Launch failed. The app 'AppName.iOS' could not be launched on 'iPhone 6s iOS 11.0'. Error: error MT0117: Can't launch a 32-bit app on a simulator that only supports 64-bit apps (iPhone 6s). Please check the logs for more details. The app has been terminated. Next, I plugged in a device (iPhone) to the Mac and tried to run the application to the device. I was able to run the application, but I got a message notifying me that the application will stop running as soon as I update the iOS of the Device (I didn't update the iOS on the device).
So, the question is how do I solve the problem? Does this has something to do with my application, or the packages that I'm using? Is there a setting that I need to set? Is it possible to run an old simulator on the Mac?
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If you change the support architectures to "i386 + x86_64" or "x86_64", it should solve your problem.
In iOS 11 and later, all apps use the 64-bit architecture. If your app targets an earlier version of iOS, you must update it to run on later versions.
If your Mac uses the 32-bit mode by default, but supports the 64-bit mode, you can start up in 64-bit mode by holding the 6 and 4 keys during startup.
If you change the support architectures to "i386 + x86_64" or "x86_64", it should solve your problem.
You can right click your project -> properties -> iOS build -> change "Supported Architectures" to "i386 + x86_64" or "x86_64"
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