ios block

//定义一个blocks变

1. int (^myblocks2) (int a, int b) = ^(int a, int b) {
2. int c = a + b;
3. return c;
4. };  

　　

//向外暴露一个接口
-(void) setBark:( void (^) (Dog *thisDog, int count) ) eachBark;