1. 替換字符

///屏幕寬度
#define kMainScreenWidth ([UIScreen mainScreen].bounds.size.width)
///屏幕高度
#define kMainScreenHeight ([UIScreen mainScreen].bounds.size.height)

2. 簡單函數(shù)

//返回二倍原型圖相應(yīng)尺寸
#define Size(originalSize) ([UIScreen mainScreen].bounds.size.width/750*originalSize)
//返回十六進制顏色值
#define color(string) 0x##string
//比較大小
#define MIN(A,B) (A < B ? A : B)

3. 復雜函數(shù)

//系統(tǒng)工具方法
__VA_ARGS__ :宏定義中的...中的所有剩余參數(shù)
__COUNTER__ 無重復的計數(shù)器，從程序啟動開始每次調(diào)用都會++，常用語宏中定義無重復的參數(shù)名稱
__FILE__：當前文件的絕對路徑,常見于log中
__LINE__：展開該宏時在文件中的行數(shù),常見于log中
__func__：所在scope的函數(shù)名稱,常見于log中

原文鏈接

4.常用宏

原文鏈接

//文件目錄
#define kPathTemp                   NSTemporaryDirectory()
#define kPathDocument               [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0]
#define kPathCache                  [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) objectAtIndex:0]

// 獲取RGB顏色
#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)

//System version utils
#define SYSTEM_VERSION_EQUAL_TO(v)                  ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedSame)
#define SYSTEM_VERSION_GREATER_THAN(v)              ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedDescending)
#define SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(v)  ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedAscending)
#define SYSTEM_VERSION_LESS_THAN(v)                 ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedAscending)
#define SYSTEM_VERSION_LESS_THAN_OR_EQUAL_TO(v)     ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedDescending)
//實例
//大于等于7.0的ios版本
#define iOS7_OR_LATER SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"7.0")
//大于等于8.0的ios版本
#define iOS8_OR_LATER SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"8.0")