UIGestureRecognizer

1、tapGesture 点击手势

• 1.1 tapGesture 的创建

  // 实例化点击手势对象
  UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapClick:)];
  
  // 向 imageView 添加点击手势
  [imageView addGestureRecognizer:tapGesture];

• 1.2 tapGesture 的设置

  // 设置点击次数
  /*
  默认为 1：单击，为 2 时为双击
  */
  singleTapGesture.numberOfTapsRequired = 1;
  
  // 设置触摸点数
  /*
  默认为 1，单个手指触摸
  */
  singleTapGesture.numberOfTouchesRequired = 1;
  
  // 单双击共存
  /*
  设置单击手势与双击手势共存，当没有检测到双击手势或检测双击手势失败时单击手势才有效
  */
  [singleTapGesture requireGestureRecognizerToFail:doubleTapGesture];
  
  // 获取点击的视图
  /*
  剪取点击的视图，附带点击手势一起剪取
  */
  UIView *tapView = tapGesture.view;
  
  // 获取点击的图片
  /*
  复制点击的图片，附带点击手势一起复制
  */
  UIImage *tapImage = ((UIImageView *)tapGesture.view).image;

• 1.3 自定义触摸响应事件处理

  - (void)tapClick:(UITapGestureRecognizer *)tapGesture {
  
  }

2、longPressGesture 长按手势

• 2.1 longPressGesture 的创建

  // 实例化长按手势对象
  UILongPressGestureRecognizer *longPressGesture = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressClick:)];
  
  // 向 imageView 添加长按手势
  [imageView addGestureRecognizer:longPressGesture];

• 2.2 longPressGesture 的设置

  // 获取手势状态
  UIGestureRecognizerState state = longPressGesture.state;
  
  // 长按手势开始
  if (longPressGesture.state == UIGestureRecognizerStateBegan) {
  
  }
  
  // 长按手势触发结束
  if (longPressGesture.state == UIGestureRecognizerStateEnded) {
  
  }

• 2.3 自定义触摸响应事件处理

  - (void)longPressClick:(UILongPressGestureRecognizer *)longPressGesture {
  
  }

3、rotationGesture 旋转手势

• 3.1 rotationGesture 的创建

  // 实例化旋转手势对象
  UIRotationGestureRecognizer *rotationGesture = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationClick:)];
  
  // 向 imageView 添加旋转手势
  [imageView addGestureRecognizer:rotationGesture];

• 3.2 rotationGesture 的设置

  // 获取旋转角度
  /*
  rotation 获取到的为弧度，1 度 ＝ PI/180 弧度
  */
  CGFloat rotation = rotationGesture.rotation  * 180 * M_1_PI;
  
  // 图片旋转
  /*
  lastRotation 为之前的角度
  */
  imageView.transform = CGAffineTransformMakeRotation(lastRotation + rotationGesture.rotation);
  
  // 旋转手势触发结束
  if (rotationGesture.state == UIGestureRecognizerStateEnded) {
  
      lastRotation += rotationGesture.rotation;
  }

• 3.3 自定义触摸响应事件处理

  // 用模拟器时需按住 option 键
  - (void)rotationClick:(UIRotationGestureRecognizer *)rotationGesture {
  
  }

4、pinchGesture 捏合手势

• 4.1 pinchGesture 的创建

  // 实例化捏合手势对象
  UIPinchGestureRecognizer *pinchGesture = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchClick:)];
  
  // 向 imageView 添加捏合手势
  [imageView addGestureRecognizer:pinchGesture];

• 4.2 pinchGesture 的设置

  // 获取缩放倍数
  CGFloat scale = pinchGesture.scale;
  
  // 图片缩放
  imageView.transform = CGAffineTransformMakeScale(pinchGesture.scale, pinchGesture.scale);
  imageView.bounds = CGRectMake(0, 0, imageView.bounds.size.width * pinchGesture.scale, 
  imageView.bounds.size.height * pinchGesture.scale);
  
  // 还原缩放倍数
  [pinchGesture setScale:1];

• 4.3 自定义触摸响应事件处理

  // 用模拟器时需按住 option 键
  - (void)pinchClick:(UIPinchGestureRecognizer *)pinchGesture {
  
  }

5、panGesture 拖动手势

• 5.1 panGesture 的创建

  // 实例化拖拽手势对象
  UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panClick:)];
  
  // 向 imageView 添加拖拽手势
  [imageView addGestureRecognizer:panGesture];

• 5.2 panGesture 的设置

  // 获取手势位置
  CGPoint currentPoint = [panGesture locationInView:self.view];
  
  // 图片移动
  imageView.center = currentPoint;

• 5.3 自定义触摸响应事件处理

  - (void)panClick:(UIPanGestureRecognizer *)panGesture {
  
  }

6、swipeGesture 滑动手势

• 6.1 swipeGesture 的创建

  // 实例化滑动手势对象
  UISwipeGestureRecognizer *swipeGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeClick:)];
  
  // 设置滑动方向，默认为 0：向右滑动
  swipeGesture.direction = UISwipeGestureRecognizerDirectionLeft | UISwipeGestureRecognizerDirectionRight;
  
  // 向 imageView 添加拖拽手势
  [imageView addGestureRecognizer:swipeGesture];

• 6.2 swipeGesture 的设置

  // 获取滑动方向
  UISwipeGestureRecognizerDirection direction = swipeGesture.direction;

• 6.3 自定义触摸响应事件处理

  - (void)swipeClick:(UISwipeGestureRecognizer *)swipeGesture {
  
  }