UITapGestureRecognizer 的用法

最新推荐文章于 2018-12-03 09:20:11 发布

转载最新推荐文章于 2018-12-03 09:20:11 发布 · 797 阅读

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本文介绍如何使用UITapGestureRecognizer实现单指、双指的单击及双击手势识别，并通过实例代码详细展示了设置与处理这些手势的过程。

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原文地址：UITapGestureRecognizer
 的用法作者：ShangShang

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//单指单击

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

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

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

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

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6:
 singleFingerOne.delegate = self;

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7:

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8: //单指双击

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

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

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 singleFingerTwo.numberOfTouchesRequired = 1;

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 singleFingerTwo.numberOfTapsRequired = 2;

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13:
 singleFingerTwo.delegate = self;

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14:

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15: //双指单击

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

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 action:@selector(handleDoubleFingerEvent:)];

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 doubleFingerOne.numberOfTouchesRequired = 2;

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 doubleFingerOne.numberOfTapsRequired = 1;

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 doubleFingerOne.delegate = self;

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21:

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

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

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 doubleFingerTwo.numberOfTouchesRequired = 2;

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 doubleFingerTwo.numberOfTapsRequired = 2;

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 doubleFingerTwo.delegate = self;

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27:

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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

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29:
 [singleFingerOne requireGestureRecognizerToFail:singleFingerTwo];

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30: //同理双指亦是如此

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 [doubleFingerOne requireGestureRecognizerToFail:doubleFingerTwo];

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32:

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 [self.view addGestureRecognizer:singleFingerOne];

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 [self.view addGestureRecognizer:singleFingerTwo];

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 [self.view addGestureRecognizer:doubleFingerOne];

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 [self.view addGestureRecognizer:doubleFingerTwo];

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37:

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 [singleFingerOne release];

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 [singleFingerTwo release];

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 [doubleFingerOne release];

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 [doubleFingerTwo release];

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处理事件的方法，代码：

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1: //处理单指事件

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

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 {

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

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5: //单指单击

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6:
 NSLog(@"单指单击");

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

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8: //单指双击

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9:
 NSLog(@"单指双击");

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 }

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 }

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12: //处理双指事件

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

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14:
 {

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

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16: //双指单击

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17:
 NSLog(@"双指单击");

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

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19: //双指双击

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 NSLog(@"双指双击");

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 }

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 }

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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。

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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。

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