Replacement for NSLog similar to http://www.cimgf.com/2010/05/02/my-current-prefix-pch-file/ This is plenty available elsewhere with a number of variations...

NSLog replacement (DLog, ALog, ULog).

// DLog will output like NSLog only when the DEBUG variable is set
#ifdef DEBUG
    #define DLog(fmt, ...) NSLog((@"%s [Line %d] " fmt), __PRETTY_FUNCTION__, __LINE__, ##__VA_ARGS__);
#else
    #define DLog(...)
#endif

// ALog will always output like NSLog
#define ALog(fmt, ...) NSLog((@"%s [Line %d] " fmt), __PRETTY_FUNCTION__, __LINE__, ##__VA_ARGS__);

// ULog will show the UIAlertView only when the DEBUG variable is set
#ifdef DEBUG
    #define ULog(fmt, ...)  { UIAlertView *alert = [[UIAlertView alloc] initWithTitle:[NSString stringWithFormat:@"%s\n [Line %d] ", __PRETTY_FUNCTION__, __LINE__] message:[NSString stringWithFormat:fmt, ##__VA_ARGS__]  delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil]; [alert show]; }
#else
    #define ULog(...)
#endif