iOS手势识别的简单应用

六种手势

1.手势分类

• UITapGestureRecognizer(敲击)
• 设置numberOfTapsRequired点击的次数
• 结合代理(BOOL) gestureRecognizer能够选定可点击的区域
• UIPinchGestureRecognizer(捏合，用于缩放)
• 注意复位问题
• UIPanGestureRecognizer(拖拽)
• UISwipeGestureRecognizer(轻扫)
• UIRotationGestureRecognizer(旋转)
• UILongPressGestureRecognizer(长按)
  • 长按的两次响应问题的解决

2.对每个手势的注意点及代码实现进行说明

• UITapGestureRecognizer(敲击)

  #pragma mark - tap敲击
  /**
   *  1.numberOfTapsRequired设置点击几回响应
   *  2.代理与(BOOL) gestureRecognizer结合，可肯定图片哪一个区域能够点，哪些不能点
   */
  -(void) setTap{
      //建立点按手势
      //initWithTarget:谁监听这个事件呢，通常控制器
      UITapGestureRecognizer *tap=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tap:)];
      //delegate
      tap.delegate=self;
      //click counts
      tap.numberOfTapsRequired=2;
      //添加手势，用的是多态addGestureRecognizer:(UIGestureRecognizer*)gestureRecognizer（父类）
      [self.imageView addGestureRecognizer:tap];
  }
  
  -(void) tap:(UITapGestureRecognizer *) tap{
      NSLog(@"%s",__func__);
  }

#pragma mark - UIGestureRecognizerDelegate //与tap结合 -(BOOL) gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch )touch{ //获取当前触摸点在self.imageView的哪一个位置 CGPoint curP=[touch locationInView:self.imageView]; if (curP.x<self.imageView.bounds.size.width0.5) { return YES; }else{ return NO; } }

```

• UIPinchGestureRecognizer(捏合，用于缩放)

#pragma mark - pinch捏合，用于缩放 -(void) setPinch{ UIPinchGestureRecognizer *pinch=[[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(pinch:)]; pinch.delegate=self; [self.imageView addGestureRecognizer:pinch]; } -(void) pinch:(UIPinchGestureRecognizer *) pinch{ NSLog(@"%s",func); self.imageView.transform=CGAffineTransformScale(self.imageView.transform, pinch.scale, pinch.scale); pinch.scale=1; } ```

• UIPanGestureRecognizer(拖拽)

  #pragma mark - pan拖拽
  /**
   *  复位是指返回到起始的状态，再能过相对上一个状态tansform来解决一些问题
   */
  -(void) setPan{
      UIPanGestureRecognizer *pan=[[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(pan:)];
  
      [self.imageView addGestureRecognizer:pan];
  }
  
  -(void) pan:(UIPanGestureRecognizer *) pan{
      NSLog(@"%s",__func__);
  //    CGPoint curP=[pan locationInView:self.imageView];
      //获取图片移动距离
      CGPoint curP=[pan translationInView:self.imageView];
      self.imageView.transform=CGAffineTransformTranslate(self.imageView.transform, curP.x, curP.y);
      //复位
      [pan setTranslation:CGPointZero inView:self.imageView];
  }

• UISwipeGestureRecognizer(轻扫)

  #pragma mark - swipe轻扫
  -(void) setSwipe{
      //添加向左滑动
      UISwipeGestureRecognizer *swipe=[[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipe:)];
      swipe.direction=UISwipeGestureRecognizerDirectionLeft;
      [self.imageView addGestureRecognizer:swipe];
      //添加向右滑动
      UISwipeGestureRecognizer *swipeDown=[[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipe:)];
      swipeDown.direction=UISwipeGestureRecognizerDirectionRight;
      [self.imageView addGestureRecognizer:swipeDown];
  
  }
  -(void) swipe:(UISwipeGestureRecognizer *)swipe{
      NSLog(@"%s",__func__);
  }

• UIRotationGestureRecognizer(旋转)

  #pragma mark - rotation旋转
  -(void) setRotation{
      UIRotationGestureRecognizer *rotation=[[UIRotationGestureRecognizer alloc]initWithTarget:self action:@selector(rotation:)];
      rotation.delegate=self;
      [self.imageView addGestureRecognizer:rotation];
  }
  -(void) rotation:(UIRotationGestureRecognizer *) rotation{
      NSLog(@"%s",__func__);
      NSLog(@"%f",rotation.rotation);
      self.imageView.transform=CGAffineTransformRotate(self.imageView.transform, rotation.rotation);
      [rotation setRotation:0];
  //    rotation.rotation=0;
  
  }

• UILongPressGestureRecognizer(长按)

  #pragma mark - longPress长按
  -(void) setLongPress{
      UILongPressGestureRecognizer *longPress=[[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(longPress:)];
      [self.imageView addGestureRecognizer:longPress];
  }
  /**
   *  长按的一些注意点，那就是长按时触发一次，离开时再触发一次
   *  加个判断，结束与开始选一个触发的时间
   *  @param longPress 传参
   */
  -(void) longPress:(UILongPressGestureRecognizer *) longPress{
      if (longPress.state==UIGestureRecognizerStateBegan) {
          NSLog(@"%s",__func__);
      }
  
  }

• 当同时多个手势能够处理时(代理)

/**

• 是否支持多个手势同时处理
• @param gestureRecognizer 。。
• @param otherGestureRecognizer 。。
• @return return value bool */ -(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{ return YES; }

3.源代码的地址

• github地址