http://my.oschina.net/yongbin45/blog/150149

// 字符串：
#ifndef nilToEmpty
#define nilToEmpty(object) (object!=nil)?object:@""
#endif

#ifndef formatStringOfObject
#define formatStringOfObject(object) [NSString stringWithFormat:@"%@", object]
#endif

#ifndef nilToEmptyFormatStringOfObject
#define nilToEmptyFormatStringOfObject(object) formatStringOfObject(nilToEmpty(object))
#endif



// 图片：
#ifndef imagePath
#define imagePath(imageName) [[NSBundle mainBundle] pathForResource:imageName ofType:@"png"]
#endif


// 颜色
#define RGBA(r, g, b, a) [UIColor colorWithRed:r/255.0f green:g/255.0f blue:b/255.0f alpha:a]
#define RGB(r, g, b) RGBA(r, g, b, 1.0f)
#define HEXCOLOR(c) [UIColor colorWithRed:((c>>16)&0xFF)/255.0f green:((c>>8)&0xFF)/255.0f blue:(c&0xFF)/255.0f alpha:1.0f];


// debug
#define debug(...) NSLog(@"%s %@", __PRETTY_FUNCTION__, [NSString stringWithFormat:__VA_ARGS__])


// iOS 支持
#define SUPPORT_IPHONE_OS_VERSION(version) ( __IPHONE_OS_VERSION_MIN_REQUIRED <= version && __IPHONE_OS_VERSION_MAX_ALLOWED >= version)


// Application delegate
#define ApplicationDelegate ((AppDelegate *)[[UIApplication sharedApplication] delegate])


// 主要单例
#define UserDefaults [NSUserDefaults standardUserDefaults]
#define NotificationCenter [NSNotificationCenter defaultCenter]
#define SharedApplication [UIApplication sharedApplication]


#define Bundle [NSBundle mainBundle]

#define MainScreen [UIScreen mainScreen]


// 网络指示
#define ShowNetworkActivityIndicator() [UIApplication sharedApplication].networkActivityIndicatorVisible = YES
#define HideNetworkActivityIndicator() [UIApplication sharedApplication].networkActivityIndicatorVisible = NO
#define NetworkActivityIndicatorVisible(x) [UIApplication sharedApplication].networkActivityIndicatorVisible = x


// 主要控件
#define NavBar self.navigationController.navigationBar
#define TabBar self.tabBarController.tabBar


// 大小尺寸
#define ScreenWidth [[UIScreen mainScreen] bounds].size.width
#define ScreenHeight [[UIScreen mainScreen] bounds].size.height

#define NavBarHeight self.navigationController.navigationBar.bounds.size.height
#define TabBarHeight self.tabBarController.tabBar.bounds.size.height


#define TouchHeightDefault 44.0f
#define TouchHeightSmall 32.0f


#define ViewWidth(v) v.frame.size.width
#define ViewHeight(v) v.frame.size.height
#define ViewX(v) v.frame.origin.x
#define ViewY(v) v.frame.origin.y


#define SelfViewWidth self.view.bounds.size.width
#define SelfViewHeight self.view.bounds.size.height


#define RectX(rect) rect.origin.x
#define RectY(rect) rect.origin.y
#define RectWidth(rect) rect.size.width
#define RectHeight(rect) rect.size.height


#define RectSetWidth(rect, w) CGRectMake(RectX(rect), RectY(rect), w, RectHeight(rect))
#define RectSetHeight(rect, h) CGRectMake(RectX(rect), RectY(rect), RectWidth(rect), h)
#define RectSetX(rect, x) CGRectMake(x, RectY(rect), RectWidth(rect), RectHeight(rect))
#define RectSetY(rect, y) CGRectMake(RectX(rect), y, RectWidth(rect), RectHeight(rect))


#define RectSetSize(rect, w, h) CGRectMake(RectX(rect), RectY(rect), w, h)
#define RectSetOrigin(rect, x, y) CGRectMake(x, y, RectWidth(rect), RectHeight(rect))



// 内存管理
#if ! __has_feature(objc_arc)
#define SBAutorelease(__v) ([__v autorelease]);
#define SBReturnAutoreleased SBAutorelease

#define SBRetain(__v) ([__v retain]);
#define SBReturnRetained SBRetain

#define SBRelease(__v) ([__v release]);

#define SBDispatchQueueRelease(__v) (dispatch_release(__v));
#else
// -fobjc-arc
#define SBAutorelease(__v)
#define SBReturnAutoreleased(__v) (__v)

#define SBRetain(__v)
#define SBReturnRetained(__v) (__v)

#define SBRelease(__v)

#if TARGET_OS_IPHONE
// Compiling for iOS
#if __IPHONE_OS_VERSION_MIN_REQUIRED >= 60000
// iOS 6.0 or later
#define SBDispatchQueueRelease(__v)
#else
// iOS 5.X or earlier
#define SBDispatchQueueRelease(__v) (dispatch_release(__v));
#endif
#else
// Compiling for Mac OS X
#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1080
// Mac OS X 10.8 or later
#define SBDispatchQueueRelease(__v)
#else
// Mac OS X 10.7 or earlier
#define SBDispatchQueueRelease(__v) (dispatch_release(__v));
#endif
#endif
#endif

iOS 多快好省的宏定义