ios UITapGestureRecognizer 单指单击、单指多击、多指单击、多指多击事件操作

【原文：http://jordy.easymorse.com/?p=809】

在ios开发中，需用到对于手指的不同操作，以手指点击为例：分为单指单击、单指多击、多指单击、多指多击。对于这些事件进行不同的操作处理，由于使用系统自带的方法通过判断touches不太容易处理，而且会有事件之间的冲突。

接下来，通过以UITapGestureRecognizer 手势实现此功能需求
代码如下：

ViewController.m中的viewDidLoad方法：

1:  //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:  }

将相应代码复制到你的工程中即可使用，由于代码中已经有详细的解释说明，这里就不在重复解释了。

代码中只是列举了单指与双指对于单击或多击的处理，同理多指的操作需修改numberOfTouchesRequired属性，对点击的次数需修改numberOfTapsRequired属性。

对于其他手势例如UISwipeGestureRecognizer，UILongPressGestureRecognizer,UILongPressGestureRecognizer的操作使用类似处理。