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,从而去识别多个不同的手势。
UITapGestureRecognizer *singleTap =[[UITapGestureRecognizer alloc] initWithTarget:selfaction:@selector(whenClickImage:)];
[_firstImage addGestureRecognizer:singleTap];
UIView *singleTapView = [singleTap view];
singleTapView.tag=0;
-(void)whenClickImage:(id)sender{
UITapGestureRecognizer *singleTap = (UITapGestureRecognizer*)sender;
NSLog(@"%d",[singleTapview].tag]);
}
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