手势UITapGestureRecognizer的tag

UITapGestureRecognizer是没有tag属性，但他有UIView的属性，我们可以通过给UIView添加tag属性，从而标记UITapGestureRecognizer。

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UITapGestureRecognizer *singleTap =         [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(whenClickImage:)];         [_firstImage addGestureRecognizer:singleTap];         UIView *singleTapView = [singleTap view];         singleTapView.tag = 0;         [singleTap release];    -(void)whenClickImage:(id)sender {     UITapGestureRecognizer *singleTap = (UITapGestureRecognizer *)sender;     NSLog(@"%d",[singleTap view].tag]); }