iOS开发中一些常用的宏定义

Debug输出：

#ifdef DEBUG
    #define debug(format, ...) CFShow([NSString stringWithFormat:format, ## __VA_ARGS__]);
    #define debugAlert(format, ...)  {UIAlertView *alert = [[UIAlertView alloc] initWithTitle:[NSString stringWithFormat:@"%s\n line: %d ", __PRETTY_FUNCTION__, __LINE__] message:[NSString stringWithFormat:format, ##__VA_ARGS__]  delegate:nil cancelButtonTitle:@"Done" otherButtonTitles:nil]; [alert show]; [alert release];}
#else
    #define debug(format, ...) 
    #define debugAlert(format, ...)
#endif

检测是否支持ARC：

#if __has_feature(objc_arc)
    // ARC
#else
    // No ARC
#endif

http://iosdevelopertips.com/debugging/remove-debug-code-for-release-build.html

http://iosdevelopertips.com/debugging/display-debug-information-in-uialertview.html