Possible Duplicate:
Is it true that one should not use NSLog() on production code?
While a developer develops an app he/she is most likely using NSlogs these logs can be huge or small.. but will this make a big presentation difference for the app if you publish it in the appstore while you still have the NSLog("something%i",[stuff]);
in your code.?
In any case, you can add to your .PCH this line:
#define DEBUG YES
and call NSLog
in this way:
if(DEBUG) NSLog(@"debug mode");
Remember to set #define DEBUG NO
when publish your app!