IOS疯狂基础之GestureRecognizer手势

在Iphone开发中，像UIimageView是不支持点击的，但往往我们却有很多能在Image上点击的需求，比如一个自定义的TableViewCell中放入三个UIimageView，在这里命名为imageleft，imagemiddle，imggeright，当tableView加载后，单击tableView中某一行中的image，我便进入该图片的详细页面。当然，现在的最新版支持手势控件，只要拖一个这样的控件到UIImageView上，实现它的委托就可以了。若版本太低不支持这样的控件，你便只好老老实实的亲手写代码了。

UITapGestureRecognizer和UIButton的点击事件冲突的解决办法

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
    if ([touch.view isKindOfClass:[UIButton class]])
    {
        return NO;
    }
    return YES;
}

常用手势：

UITapGestureRecognizer

• UITapGestureRecognizer
• UIPinchGestureRecognizer
• UIRotationGestureRecognizer
• UISwipeGestureRecognizer
• UIPanGestureRecognizer
• UILongPressGestureRecognizer

分別是 Tap（点一下）、Pinch（二指往內或往外拨动）、Rotation（旋转）、Swipe（滑动，快速移动）、Pan （拖移，慢速移动）以及 LongPress（长按）。

以下是UITapGestureRecognizer 的用法 

//单指单击

2: UITapGestureRecognizer *singleFingerOne = [[UITapGestureRecognizer alloc] initWithTarget:self

3: action:@selector(handleSingleFingerEvent:)];

4: singleFingerOne.numberOfTouchesRequired = 1;//手指数

5: singleFingerOne.numberOfTapsRequired = 1;//tap次数

6: singleFingerOne.delegate = self;

7:

8: //单指双击

9: UITapGestureRecognizer *singleFingerTwo = [[UITapGestureRecognizer alloc] initWithTarget:self

10: action:@selector(handleSingleFingerEvent:)];

11: singleFingerTwo.numberOfTouchesRequired = 1;

12: singleFingerTwo.numberOfTapsRequired = 2;

13: singleFingerTwo.delegate = self;

14:

15: //双指单击

16: UITapGestureRecognizer *doubleFingerOne = [[UITapGestureRecognizer alloc] initWithTarget:self

17: action:@selector(handleDoubleFingerEvent:)];

18: doubleFingerOne.numberOfTouchesRequired = 2;

19: doubleFingerOne.numberOfTapsRequired = 1;

20: doubleFingerOne.delegate = self;

21:

22: UITapGestureRecognizer *doubleFingerTwo = [[UITapGestureRecognizer alloc] initWithTarget:self

23:    action:@selector(handleDoubleFingerEvent:)];

24: doubleFingerTwo.numberOfTouchesRequired = 2;

25: doubleFingerTwo.numberOfTapsRequired = 2;

26: doubleFingerTwo.delegate = self;

27:

28: //如果不加下面的话，当单指双击时，会先调用单指单击中的处理，再调用单指双击中的处理

29: [singleFingerOne requireGestureRecognizerToFail:singleFingerTwo];

30: //同理双指亦是如此

31: [doubleFingerOne requireGestureRecognizerToFail:doubleFingerTwo];

32:

33: [self.view addGestureRecognizer:singleFingerOne];

34: [self.view addGestureRecognizer:singleFingerTwo];

35: [self.view addGestureRecognizer:doubleFingerOne];

36: [self.view addGestureRecognizer:doubleFingerTwo];

37:

38: [singleFingerOne release];

39: [singleFingerTwo release];

40: [doubleFingerOne release];

41: [doubleFingerTwo release];

处理事件的方法，代码：

1: //处理单指事件

2: - (void)handleSingleFingerEvent:(UITapGestureRecognizer *)sender

3: {

4: if (sender.numberOfTapsRequired == 1) {

5: //单指单击

6: NSLog(@"单指单击");

7: }else if(sender.numberOfTapsRequired == 2){

8: //单指双击

9: NSLog(@"单指双击");

10: }

11: }

12: //处理双指事件

13: - (void)handleDoubleFingerEvent:(UITapGestureRecognizer *)sender

14: {

15: if (sender.numberOfTapsRequired == 1) {

16: //双指单击

17: NSLog(@"双指单击");

18: }else if(sender.numberOfTapsRequired == 2){

19: //双指双击

20: NSLog(@"双指双击");

21: }

22: }