ios开发--常用宏定义(部分转)

1、release时，屏蔽log
 
#if defined (DEBUG) && DEBUG == 1  
  
#else  
#define NSLog(...) {};  
#endif  
 
2、在主线程或在后台执行block

#define BACK(block) dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), block)  
#define MAIN(block) dispatch_async(dispatch_get_main_queue(),block)  
 
3、设备相关
 
#define isRetina ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(640, 960), [[UIScreen mainScreen] currentMode].size) : NO)  
  
#define iPhone5 ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(640, 1136), [[UIScreen mainScreen] currentMode].size) : NO)  
  
#define isPad (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)  
  
#define CurrentSystemVersion ([[UIDevice currentDevice] systemVersion])  
  
#define CurrentLanguage ([[NSLocale preferredLanguages] objectAtIndex:0])   
 
4、区分模拟器和真机

#if TARGET_OS_IPHONE  
//iPhone Device  
#endif  
  
#if TARGET_IPHONE_SIMULATOR  
//iPhone Simulator  
#endif  
 
5、根据是否使用ARC做不同操作

#if __has_feature(objc_arc)  
    //compiling with ARC  
#else  
    // compiling without ARC  
#endif  

转 http://apluck.iteye.com/blog/1768787