App crashes in Release build but not in debug

Question

As I said in the title, I am writing an app for iPhone which runs perfectly in debug mode but when I build it as release and install it via TestFlight, it crashes. Due to t

Answer 1

To catch the crash test the with the Optimization Level set to Fastest, Smallest [-Os] in Debug mode to more closely simulate the code that will be generated & running on the user’s device.

You can set it in build settings, under Swift Compiler/Code Generation