Recipe: NSLog Tricks

NSLog is not just useful for printing out your variables in the heat of a debugging session – for instance, did you know you can get NSLog to spill the beans on the line number you’re on in the current method, or the path of the current file?  There are a number of compile-time macros that  you can use in your NSLog statements to help you see more about your code:

For example, to see which method and line number you’re in, try this:

NSLog(@”Greetings from  %@ at line %d”, NSStringFromSelector(_cmd), __LINE__)

which will yield something like this in your console at run time:

2010-02-11 06:44:34.325 BarsReport[4218:207] Greetings from recenterMapOnUser: at line 189

Source: Apple Developer Documentation