学习笔记-iOS常用宏定义

• 开发的时候打印，但是发布的时候不打印

#ifdef DEBUG
  #define NSLog(...) NSLog(@"%s 第%d行 \n %@\n\n",__func__,__LINE__,[NSString stringWithFormat:__VA_ARGS__])
#else
#define NSLog(...)
#endif

• 强/弱引用

 #define strongSelf(type) __strong typeof(type) type = weak##type;
 #define weakSelf(type)  __weak typeof(type) weak##type = type;

• RGB颜色 16进制->10进制

#define UIColorFromRGB(rgbValue) [UIColor colorWithRed:((float)((rgbValue & 0xFF0000) >> 16))/255.0 green:((float)((rgbValue & 0xFF00) >> 8))/255.0 blue:((float)(rgbValue & 0xFF))/255.0 alpha:1.0]
// 使用示例
    self.view.backgroundColor = UIColorFromRGB(0xFFB6C1);

• RGBA颜色

#define COLOR(R, G, B, A) [UIColor colorWithRed:R/255.0 green:G/255.0 blue:B/255.0 alpha:A]

• 获取屏幕宽度、高度

#define ScreenWidth  ([UIScreen mainScreen].applicationFrame.size.width)
#define ScreenHeight ([UIScreen mainScreen].applicationFrame.size.height)

• 获取Document路径

#define DocumentPath [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject]

• 获取Temp路径

#define TempPath NSTemporaryDirectory()

• 获取Cache路径

#define CachePath [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) firstObject]

• 字符串是否为空

#define StringIsEmpty(str) ([str isKindOfClass:[NSNull class]] || str == nil || [str length] < 1 ? YES : NO )

• 数组是否为空

#define ArrayIsEmpty(array) (array == nil || [array isKindOfClass:[NSNull class]] || array.count == 0)

• 字典是否为空

#define DictIsEmpty(dic) (dic == nil || [dic isKindOfClass:[NSNull class]] || dic.allKeys == 0)

• 对象是否为空

#define ObjectIsEmpty(_object) (_object == nil \
  || [_object isKindOfClass:[NSNull class]] \
  || ([_object respondsToSelector:@selector(length)] && [(NSData *)_object length] == 0) \
  || ([_object respondsToSelector:@selector(count)] && [(NSArray *)_object count] == 0))

• 系统版本检测

 #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)