iOS回调

回调的简单使用，留一个笔记，方便以后查找

 

1，定义blocktypedefvoid(^signedRightJson)();

             typedef void(^signedErrorJson)();

2，定义的中复制

 

-(void)performActionWithCompletion:(signedRightJson)completion{

   

    completion();

    

 

}

3，调用

   BlockDemo *bd= [[BlockDemoalloc]init];

        [bd performActionWithCompletion:^{

    

            

            NSLog(@"%@",d.price);

            

 

        }];

 

 

 

 

完整代码：

 

typedef void(^signedRightJson)();
typedef void(^signedErrorJson)();

@interface BlockDemo : NSObject


//定义方法
-(void)performActionWithCompletion:(signedRightJson) completion;

@end



#import "BlockDemo.h"

@implementation BlockDemo

-(void)performActionWithCompletion:(signedRightJson)completion{
   
    completion();
    
}

@end




BlockDemo *bd= [[BlockDemo alloc]init];
        [bd performActionWithCompletion:^{
    
            
            NSLog(@"%@",d.price);
            
        }];