iOS宏的使用和技巧

1. 替换字符

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

2. 简单函数

//返回二倍原型图相应尺寸
#define Size(originalSize) ([UIScreen mainScreen].bounds.size.width/750*originalSize)
//返回十六进制颜色值
#define color(string) 0x##string
//比较大小
#define MIN(A,B) (A < B ? A : B)

3. 复杂函数

//系统工具方法
__VA_ARGS__ :宏定义中的...中的所有剩余参数
__COUNTER__ 无重复的计数器，从程序启动开始每次调用都会++，常用语宏中定义无重复的参数名称
__FILE__：当前文件的绝对路径,常见于log中
__LINE__：展开该宏时在文件中的行数,常见于log中
__func__：所在scope的函数名称,常见于log中

原文链接

4.常用宏

原文链接

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

// 获取RGB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)

//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)
//实例
//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")