UITapGestureRecognizer 的用法(轻触手势识别器)

时间：2023-03-09 16:34:46
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 = ; //手指数

 singleFingerOne.numberOfTapsRequired = ; //tap次数

 singleFingerOne.delegate = self;

 //单指双击

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

 action:@selector(handleSingleFingerEvent:)];

 singleFingerTwo.numberOfTouchesRequired = ;

 singleFingerTwo.numberOfTapsRequired = ;

 singleFingerTwo.delegate = self;

 //双指单击

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

 action:@selector(handleDoubleFingerEvent:)];

 doubleFingerOne.numberOfTouchesRequired = ;

 doubleFingerOne.numberOfTapsRequired = ;

 doubleFingerOne.delegate = self;

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

    action:@selector(handleDoubleFingerEvent:)];

 doubleFingerTwo.numberOfTouchesRequired = ;

 doubleFingerTwo.numberOfTapsRequired = ;

 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：

: //处理单指事件

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

: {

:   if (sender.numberOfTapsRequired == ) {

:    //单指单击

:    NSLog(@"单指单击");

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

:    //单指双击

:    NSLog(@"单指双击");

:  }

: }

: //处理双指事件

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

: {

: if (sender.numberOfTapsRequired == ) {

: //双指单击

: NSLog(@"双指单击");

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

: //双指双击

: NSLog(@"双指双击");

: }

: }




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。
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