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When I run code such as the following:
- (void)viewDidLoad
{
#ifdef DEBUG
NSLog(@"debug");
#else
NSLog(@"here");
#endif
[super viewDidLoad];
}
I see “debug” printed in the log, but I did not define DEBUG explicitly. Where is it defined?
It is most likely defined in your Build Settings under Preprocessor Macros.
Here is an example from one of my projects
