华山论剑之iOS手势（UIGestureRecognizer ）

柔光的暖阳◎ 2023-01-05 03:56 233阅读 0赞

> ##### 子所不欲,勿施于人. #####

iOS系统在3.2版本之后提供了一些常用的手势,总共是6大手势,总共是六大类,当然了,当这些手势不能满足我们的工程需要的时候,我们需要自定义手势,这个手势类继承于UIGestureRecognizer这个类.

<table> 
 <thead> 
  <tr> 
   <th>手势名称</th> 
   <th align="center">手势类</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>点击手势</td> 
   <td align="center">UITapGestureRecognizer</td> 
  </tr> 
  <tr> 
   <td>轻扫手势</td> 
   <td align="center">UISwipeGestureRecognizer</td> 
  </tr> 
  <tr> 
   <td>长按手势</td> 
   <td align="center">UILongPressGestureRecognizer</td> 
  </tr> 
  <tr> 
   <td>旋转手势</td> 
   <td align="center">UIRotationGestureRecognizer</td> 
  </tr> 
  <tr> 
   <td>拖动手势</td> 
   <td align="center">UIPanGestureRecognizer</td> 
  </tr> 
  <tr> 
   <td>捏合手势</td> 
   <td align="center">UIPinchGestureRecognizer</td> 
  </tr> 
 </tbody> 
</table>

#### UITapGestureRecognizer (点击手势) ####

点击手势比较简单,但是也是我们最常用的一种手势,我们只需要创建出手势并且添加到对应的视图上即可.

UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapAction:)];//tapAction:这个方法中我们添加当点击手势触发的时候,我们需要执行的方法
    
    tapGesture.numberOfTapsRequired = 1; 
    //点击次数
    
    tapGesture.numberOfTouchesRequired = 1; 
    //点击手指数
    
    [self.view addGestureRecognizer:tapGesture];

#### UISwipeGestureRecognizer(轻扫手势) ####

轻扫手势当,有左右轻扫之分,所以我们可以区别对待,向左轻扫和向右轻扫

UISwipeGestureRecognizer *swipeGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeGesture:)];
    
    //设置轻扫的方向
    
    swipeGesture.direction = UISwipeGestureRecognizerDirectionRight; 
    //向右
    
    [self.view addGestureRecognizer:swipeGesture];
    
    UISwipeGestureRecognizer *swipeGestureLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeGesture:)];
    
    //设置轻扫的方向
    
    swipeGestureLeft.direction = UISwipeGestureRecognizerDirectionLeft; 
    //向左
    
    [self.view addGestureRecognizer:swipeGestureLeft];
    
    //轻扫手势触发方法

下面的方法可以进行左右轻扫的设置.

-(void)swipeGesture:(id)sender
    {
    UISwipeGestureRecognizer *swipe = sender
    if(swipe.direction == UISwipeGestureRecognizerDirectionLeft)   {      
    //向左轻扫
       
      } if(swipe.direction == UISwipeGestureRecognizerDirectionRight){     
    //向右轻扫    
      }
    
    }

#### UILongPressGestureRecognizer(长按手势) ####

长按手势也是一种常用的手势,一般我们会用在图片上面,长按之后出现选项对话框,这时候,用户就可以进行进一步的用户交互了.

UILongPressGestureRecognizer *longPressGesture = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressGesture:)];
    //设置长按时间
    longPressGesture.minimumPressDuration = 0.5;
    [self.view addGestureRecognizer:longPressGesture];

//长按手势触发方法
    -(void)longPressGesture:(id)sender
    {
         UILongPressGestureRecognizer *longPress = sender;
         if (longPress.state == UIGestureRecognizerStateBegan)
         {
          
         }
    }

长按手势的常用状态如下  
开始：UIGestureRecognizerStateBegan  
改变：UIGestureRecognizerStateChanged  
结束：UIGestureRecognizerStateEnded  
取消：UIGestureRecognizerStateCancelled  
失败：UIGestureRecognizerStateFailed

#### UIPanGestureRecognizer (拖动手势) ####

拖动手势,也是一种常见的手势,我们一般用图标的拖动.

UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panGesture:)];
    [self.view addGestureRecognizer:panGesture];

//拖动手势触发方法
    -(void) panGesture:(id)sender
    {
        UIPanGestureRecognizer *panGesture = sender;
        CGPoint movePoint = [panGesture translationInView:self.view];
        //your code
    }

#### UIPinchGestureRecognizer (捏合手势) ####

捏合手势一般用于图片放大之后的还原

UIPinchGestureRecognizer *pinchGesture = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchGesture:)];
    [self.view addGestureRecognizer:pinchGesture];
        捏合手势触发方法
    -(void) pinchGesture:(id)sender
    {
        UIPinchGestureRecognizer *gesture = sender;
        //手势改变时
        if (gesture.state == UIGestureRecognizerStateChanged)
        {
             //捏合手势中scale属性记录的缩放比例
            _imageView.transform = CGAffineTransformMakeScale(gesture.scale, gesture.scale);
        }
        //结束后恢复
        if(gesture.state==UIGestureRecognizerStateEnded)
        {
            [UIView animateWithDuration:0.5 animations:^{
                _imageView.transform = CGAffineTransformIdentity;//取消一切形变
            }];
        }
    }

#### UIRotationGestureRecognizer (旋转手势) ####

旋转手势也是我们常见的一种手势之一

UIRotationGestureRecognizer *rotationGesture = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationGesture:)];
    [self.view addGestureRecognizer:rotationGesture];

//旋转手势触发方法
    -(void)rotationGesture:(id)sender
    {
        UIRotationGestureRecognizer *gesture = sender;
        if (gesture.state==UIGestureRecognizerStateChanged)
        {
            _imageView.transform=CGAffineTransformMakeRotation(gesture.rotation);
        }
        if(gesture.state==UIGestureRecognizerStateEnded)
        {
            [UIView animateWithDuration:1 animations:^{
                _imageView.transform=CGAffineTransformIdentity;//取消形变
            }];
        }
    }

> ###### 注意:一个手势只能对应一个 View，但是一个 View 可以有多个手势。 ######

原文参考:http://www.open-open.com/lib/view/open1435284827732.html