UITapGestureRecognizer 的用法(轻触手势识别器)

最近在项目中用到了手势操作，键盘回收时还是挺常用的，现在总结下，多谢网络上大神们的分享。

先分享下我在项目中用的代码：

UITapGestureRecognizer * mytap=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tap_gestureRecognizer:)];
[self addGestureRecognizer:mytap];
[mytap release];

//收回键盘
-(void)tap_gestureRecognizer:(UITapGestureRecognizer *)tap_gest
{
    [self.scv_stockPriceTextField resignFirstResponder];
    [self.scv_stockAmoutTextField resignFirstResponder];
}

---

//单指单击
 UITapGestureRecognizer *singleFingerOne = [[UITapGestureRecognizer alloc] initWithTarget:self
 action:@selector(handleSingleFingerEvent:)];
 singleFingerOne.numberOfTouchesRequired = 1; //手指数
 singleFingerOne.numberOfTapsRequired = 1; //tap次数
 singleFingerOne.delegate = self;
 //单指双击
 UITapGestureRecognizer *singleFingerTwo = [[UITapGestureRecognizer alloc] initWithTarget:self
 action:@selector(handleSingleFingerEvent:)];
 singleFingerTwo.numberOfTouchesRequired = 1;
 singleFingerTwo.numberOfTapsRequired = 2;
 singleFingerTwo.delegate = self;
 //双指单击
 UITapGestureRecognizer *doubleFingerOne = [[UITapGestureRecognizer alloc] initWithTarget:self
 action:@selector(handleDoubleFingerEvent:)];
 doubleFingerOne.numberOfTouchesRequired = 2;
 doubleFingerOne.numberOfTapsRequired = 1;
 doubleFingerOne.delegate = self;
 UITapGestureRecognizer *doubleFingerTwo = [[UITapGestureRecognizer alloc] initWithTarget:self
    action:@selector(handleDoubleFingerEvent:)];
 doubleFingerTwo.numberOfTouchesRequired = 2;
 doubleFingerTwo.numberOfTapsRequired = 2;
 doubleFingerTwo.delegate = self;
 //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
 [singleFingerOne requireGestureRecognizerToFail:singleFingerTwo];
 //同理双指亦是如此
 [doubleFingerOne requireGestureRecognizerToFail:doubleFingerTwo];
 [self.view addGestureRecognizer:singleFingerOne];
 [self.view addGestureRecognizer:singleFingerTwo];
 [self.view addGestureRecognizer:doubleFingerOne];
 [self.view addGestureRecognizer:doubleFingerTwo];
 [singleFingerOne release];
 [singleFingerTwo release];
 [doubleFingerOne release];
 [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。

UIKit中包含了UIGestureRecognizer类，用于检测发生在设备中的手势。UIGestureRecognizer是一个抽象类，定义了所有手势的基本行为，它有下面一些子类用于处理具体的手势： 

    1、拍击UITapGestureRecognizer (任意次数的拍击)  
    2、向里或向外捏UIPinchGestureRecognizer (用于缩放)  
    3、摇动或者拖拽UIPanGestureRecognizer  
    4、擦碰UISwipeGestureRecognizer (以任意方向)  
    5、旋转UIRotationGestureRecognizer (手指朝相反方向移动)  
    6、长按UILongPressGestureRecognizer 

对于不同类型的手势识别器，具有不同的配置属性。比如UITapGestureRecognizer，可以配置拍击次数。界面接收到手势之后，可以发送一 个消息，用于处理响应手势动作后的任务。当然，不同的手势识别器，发送的消息方法也会有所不同。