for my App I'd like to have a debug view that I want to have only in debug-builds and not in release builds. I don't want to change my code though. Thats why i am wondering if I can check some compiler flag if this is a release build and exclude some code that i only want to have for debug builds.
In your projects build settings, look for the preprocessor defines section, in there you can define a variable in your debug build only, such as DEBUG=1, and then use this in your code:
#if DEBUG
NSLog(@"This will only print in debug!");
#endif
Just make sure in your release configuration, that same define is set to 0 in the same location in your build settings