1. 定义
typedef void(^BACK_BLOCK)(NSString*);
@property (nonatomic, strong) void(^block)(NSString *);
2.调用
self.block(@"dlflsdfl");
3.实现
detailTableView.block = ^(NSString *text) {
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
cell.detailTextLabel.text = text;
};