Objective-C程序设计第六版

block

https://www.jianshu.com/p/d01a321a3c6d

https://blog.youkuaiyun.com/xiaoxingaiwo/article/details/81228636?utm_medium=distribute.pc_relevant.none-task-blog-BlogCommendFromBaidu-1.nonecase&depth_1-utm_source=distribute.pc_relevant.none-task-blog-BlogCommendFromBaidu-1.nonecase

 

1.返回值类型为void

 void (^blockName)(int)=^void(int a){};

 

//2.参数为void

int (^blk4)(void)=^int{return 7;};

 

 //3.返回值和参数都是void

 void(^blk5)(void)=^{};

 

  //4.匿名block

  ^int(void){return 5;};

 

  //使用typedef简化Block的声明

   typedef void (^blk6)(void);

  //属性:property(nonamatic,copy)blk6 imageClickBlock;

 

  //局部位置声明一个block属性

   void (^globalBlockInMemory)(int number)=^(int number){int a=0;};

   globalBlockInMemory(90);