ios開發常用的宏

  NavigationBar_HEIGHT 44      SCREEN_WIDTH ([UIScreen mainScreen].bounds.size.width)   SCREEN_HEIGHT ([UIScreen mainScreen].bounds.size.height)   SAFE_RELEASE(x) [x release];x=nil   IOS_VERSION [[[UIDevice currentDevice] systemVersion] floatValue]   CurrentSystemVersion ([[UIDevice currentDevice] systemVersion])   CurrentLanguage ([[NSLocale preferredLanguages] objectAtIndex:0])      BACKGROUND_COLOR [UIColor colorWithRed:242.0/255.0 green:236.0/255.0 blue:231.0/255.0 alpha:1.0]               #   define DLog(fmt, ...) NSLog((               isRetina ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(640, 960), [[UIScreen mainScreen] currentMode].size) : NO)   iPhone5 ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(640, 1136), [[UIScreen mainScreen] currentMode].size) : NO)   isPad (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)         TARGET_OS_IPHONE          TARGET_IPHONE_SIMULATOR               __has_feature(objc_arc)                   BACK(block) dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), block)   MAIN(block) dispatch_async(dispatch_get_main_queue(),block)         USER_DEFAULT [NSUserDefaults standardUserDefaults]   ImageNamed(_pointer) [UIImage imageNamed:[UIUtil imageName:_pointer]]            mark - common functions   RELEASE_SAFELY(__POINTER) { [__POINTER release]; __POINTER = nil; }         mark - degrees/radian functions   degreesToRadian(x) (M_PI * (x) / 180.0)   radianToDegrees(radian) (radian*180.0)/(M_PI)      mark - color functions   RGBCOLOR(r,g,b) [UIColor colorWithRed:(r)/255.0f green:(g)/255.0f blue:(b)/255.0f alpha:1]   RGBACOLOR(r,g,b,a) [UIColor colorWithRed:(r)/255.0f green:(g)/255.0f blue:(b)/255.0f alpha:(a)]