Objective-C macros to aid in iOS app debug logging

iOSLogMacros.m

// mmcneely: From http://stackoverflow.com/questions/969130/nslog-tips-and-tricks
// - DLog prints output to the console, but only if the DEBUG symbol is defined
// - ALog prints output to the console no matter what
// - ULog pops up window on the device (or simulator)

#ifdef DEBUG
#   define DLog(fmt, ...) NSLog((@"%s [Line %d] " fmt), __PRETTY_FUNCTION__, __LINE__, ##__VA_ARGS__);
#else
#   define DLog(...)
#endif
#define ALog(fmt, ...) NSLog((@"%s [Line %d] " fmt), __PRETTY_FUNCTION__, __LINE__, ##__VA_ARGS__);
#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

Originally posted to Stack Overflow by Diederik Hoogenboom, with the "ULog" addition by Lee Whitney