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

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：

<span class="lnum" style="color: rgb(96, 96, 96);">   1:  </span><span class="rem" style="color: rgb(0, 128, 0);">//单指单击</span>

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

<span class="lnum" style="color: rgb(96, 96, 96);">   3:  </span>                                    action:@selector(handleSingleFingerEvent:)];

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

<span class="lnum" style="color: rgb(96, 96, 96);">   5:  </span>    singleFingerOne.numberOfTapsRequired = 1; <span class="rem" style="color: rgb(0, 128, 0);">//tap次数</span>

6:      singleFingerOne.delegate = self;

<span class="lnum" style="color: rgb(96, 96, 96);">   7:  </span>

8:      //单指双击

<span class="lnum" style="color: rgb(96, 96, 96);">   9:  </span>    UITapGestureRecognizer *singleFingerTwo = [[UITapGestureRecognizer alloc] initWithTarget:self

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

<span class="lnum" style="color: rgb(96, 96, 96);">  11:  </span>    singleFingerTwo.numberOfTouchesRequired = 1;

12:      singleFingerTwo.numberOfTapsRequired = 2;

<span class="lnum" style="color: rgb(96, 96, 96);">  13:  </span>    singleFingerTwo.<span class="kwrd" style="color: rgb(0, 0, 255);">delegate</span> = self;

14:

<span class="lnum" style="color: rgb(96, 96, 96);">  15:  </span>    <span class="rem" style="color: rgb(0, 128, 0);">//双指单击</span>

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

<span class="lnum" style="color: rgb(96, 96, 96);">  17:  </span>                                     action:@selector(handleDoubleFingerEvent:)];

18:      doubleFingerOne.numberOfTouchesRequired = 2;

<span class="lnum" style="color: rgb(96, 96, 96);">  19:  </span>    doubleFingerOne.numberOfTapsRequired = 1;

20:      doubleFingerOne.delegate = self;

<span class="lnum" style="color: rgb(96, 96, 96);">  21:  </span>

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

<span class="lnum" style="color: rgb(96, 96, 96);">  23:  </span>   action:@selector(handleDoubleFingerEvent:)];

24:      doubleFingerTwo.numberOfTouchesRequired = 2;

<span class="lnum" style="color: rgb(96, 96, 96);">  25:  </span>    doubleFingerTwo.numberOfTapsRequired = 2;

26:      doubleFingerTwo.delegate = self;

<span class="lnum" style="color: rgb(96, 96, 96);">  27:  </span>

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

<span class="lnum" style="color: rgb(96, 96, 96);">  29:  </span>    [singleFingerOne requireGestureRecognizerToFail:singleFingerTwo];

30:      //同理双指亦是如此

<span class="lnum" style="color: rgb(96, 96, 96);">  31:  </span>    [doubleFingerOne requireGestureRecognizerToFail:doubleFingerTwo];

32:

<span class="lnum" style="color: rgb(96, 96, 96);">  33:  </span>    [self.view addGestureRecognizer:singleFingerOne];

34:      [self.view addGestureRecognizer:singleFingerTwo];

<span class="lnum" style="color: rgb(96, 96, 96);">  35:  </span>    [self.view addGestureRecognizer:doubleFingerOne];

36:      [self.view addGestureRecognizer:doubleFingerTwo];

<span class="lnum" style="color: rgb(96, 96, 96);">  37:  </span>

38:      [singleFingerOne release];

<span class="lnum" style="color: rgb(96, 96, 96);">  39:  </span>    [singleFingerTwo release];

40:      [doubleFingerOne release];

<span class="lnum" style="color: rgb(96, 96, 96);">  41:  </span>    [doubleFingerTwo release];

处理事件的方法，代码：

<span class="lnum" style="color: rgb(96, 96, 96);">   1:  </span><span class="rem" style="color: rgb(0, 128, 0);">//处理单指事件</span>

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

<span class="lnum" style="color: rgb(96, 96, 96);">   3:  </span>{

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

<span class="lnum" style="color: rgb(96, 96, 96);">   5:  </span>        <span class="rem" style="color: rgb(0, 128, 0);">//单指单击</span>

6:          NSLog(@"单指单击");

<span class="lnum" style="color: rgb(96, 96, 96);">   7:  </span>}<span class="kwrd" style="color: rgb(0, 0, 255);">else</span> <span class="kwrd" style="color: rgb(0, 0, 255);">if</span>(sender.numberOfTapsRequired == 2){

8:          //单指双击

<span class="lnum" style="color: rgb(96, 96, 96);">   9:  </span>        NSLog(<span class="str" style="color: rgb(0, 96, 128);">@"单指双击"</span>);

10:      }

<span class="lnum" style="color: rgb(96, 96, 96);">  11:  </span>}

12:  //处理双指事件

<span class="lnum" style="color: rgb(96, 96, 96);">  13:  </span>- (<span class="kwrd" style="color: rgb(0, 0, 255);">void</span>)handleDoubleFingerEvent:(UITapGestureRecognizer *)sender

14:  {

<span class="lnum" style="color: rgb(96, 96, 96);">  15:  </span>    <span class="kwrd" style="color: rgb(0, 0, 255);">if</span> (sender.numberOfTapsRequired == 1) {

16:          //双指单击

<span class="lnum" style="color: rgb(96, 96, 96);">  17:  </span>        NSLog(<span class="str" style="color: rgb(0, 96, 128);">@"双指单击"</span>);

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

<span class="lnum" style="color: rgb(96, 96, 96);">  19:  </span>        <span class="rem" style="color: rgb(0, 128, 0);">//双指双击</span>

20:          NSLog(@"双指双击");

<span class="lnum" style="color: rgb(96, 96, 96);">  21:  </span>}

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。