UIImageView並不像UIButton那樣點選滑鼠就可以關聯點選事件，也不像Android裡有onClickListener，這個時候就需要藉助UITapGestureRecognizer類，從類名上就可以看出，這個類就是用於處理tap(單擊)事件的。

建立兩個UIImageView物件,imageView1和imageView2

1. [imageView1 setUserInteractionEnabled:YES];
2. [imageView2 setUserInteractionEnabled:YES];
3. [imageView1 addGestureRecognizer:[[UITapGestureRecognizer
   alloc] initWithTarget:self action:@selector(clickCategory:)]];
4. [imageView2 addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(clickCategory:)]];

經測試，多個UIImageView不能共用一個UITapGestureRecognizer物件，之前呼叫的會沒效果。
根據點選的view判斷來自誰的點選

1. -(void)clickCategory:(UITapGestureRecognizer
   *)gestureRecognizer
2. {
3. NSLog(@"click");
4. NSLog(@"%hhd",[gestureRecognizer isMemberOfClass:[UITapGestureRecognizerclass]]);
5. UIView*viewClicked=[gestureRecognizer view];
6. if(viewClicked==imageView1){
7. NSLog(@"imageView1");
8. }elseif(viewClicked==imageView2)
9. {
10. NSLog(@"imageView2");
11. }
12. }