block

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vc2中：头文件

1 

typedef void(^attentionBlock)(id sender);

2 

@property (nonatomic,copy) attentionBlock attentionblock;

3 

- (void)attentionwithBlock:(attentionBlock)block;

.m中

4 实现方法

- (void)attentionwithBlock:(attentionBlock)block{

    self.attentionblock = block;

}

5 按钮点击事件

- (void)attentionSelect{

    self.attentionblock(_indexPathCell);

  }

vc1中

6

[vc2 attentionwithBlock:^(id obj) {

    }];

block

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原文地址：http://www.cnblogs.com/lyl-/p/4522896.html