简单的block使用

class1:

 .h 

@property (nonatomic,copy) void(^itemClick)(NSString  *index);

.m

self.itemClick(headModel.info_id);

class2:

//实现

    homeHeadView.itemClick = ^(NSString *index){

        YYInfoDetailViewController *infoDetail = [[YYInfoDetailViewControlleralloc]init];

        infoDetail.info_id = index;

        [self.navigationControllerpushViewController:infoDetailanimated:YES];

        

    };