iOS----------开发中常用的宏有那些

• OC对象判断是否为空？

• UI尺寸类的宏

• LOG日志打印

• 判断设备？系统？

• 判断当前的iPhone设备/系统版本

• 定义一个define函数

  #define TT_RELEASE_CF_SAFELY(__REF) { if (nil != (__REF)) { CFRelease(__REF); __REF = nil; } }

• 使用ARC和不使用ARC

#if __has_feature(objc_arc)

//compiling with ARC

#else

// compiling without ARC

#endif

#pragma mark - common functions

#define RELEASE_SAFELY(__POINTER) { [__POINTER release]; __POINTER = nil; }

• 释放一个对象

#define SAFE_DELETE(P) if(P) { [P release], P = nil; }

#define SAFE_RELEASE(x) [x release];x=nil

• 图片相关

  //读取本地图片
  
  #define LOADIMAGE(file,ext) [UIImage imageWithContentsOfFile:［NSBundle mainBundle]pathForResource:file ofType:ext］
  
  //定义UIImage对象
  
  #define IMAGE(A) [UIImage imageWithContentsOfFile:［NSBundle mainBundle] pathForResource:A ofType:nil］
  
  //定义UIImage对象
  
  #define ImageNamed(_pointer) [UIImage imageNamed:[UIUtil imageName:_pointer］

• 颜色相关

• 方正黑体简体字体定义

  #define FONT(F) [UIFont fontWithName:@"FZHTJW--GB1-0" size:F]

• 网址相关 
  
• 设置View的tag属性

  #define VIEWWITHTAG(_OBJECT, _TAG) [_OBJECT viewWithTag : _TAG]

• 语言/国际化相关
  
• 线程 G－C－D

  #define BACK(block) dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), block)
  
  #define MAIN(block) dispatch_async(dispatch_get_main_queue(),block)

• 沙盒目录文件

  //获取temp
  
  #define kPathTemp NSTemporaryDirectory()
  
  //获取沙盒 Document
  
  #define kPathDocument [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject]
  
  //获取沙盒 Cache
  
  #define kPathCache [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) firstObject]

• NSUserDefaults 实例化

  #define USER_DEFAULT [NSUserDefaults standardUserDefaults]

• 由角度获取弧度 ,由弧度获取角度

  #define degreesToRadian(x) (M_PI * (x) / 180.0)
  
  #define radianToDegrees(radian) (radian*180.0)/(M_PI)

• 单例化一个类

#define SYNTHESIZE_SINGLETON_FOR_CLASS(classname) \

\

static classname *shared##classname = nil; \

\

+ (classname *)shared##classname \

{ \

@synchronized(self) \

{ \

if (shared##classname == nil) \

{ \

shared##classname = ［self alloc] init]; \

} \

} \

\

return shared##classname; \

} \

\

+ (id)allocWithZone:(NSZone *)zone \

{ \

@synchronized(self) \

{ \

if (shared##classname == nil) \

{ \

shared##classname = [super allocWithZone:zone]; \

return shared##classname; \

} \

} \

\

return nil; \

} \

\

- (id)copyWithZone:(NSZone *)zone \

{ \

return self; \

}