UIGestureRecognizer 手势

添加、移除手势

    [self.view removeGestureRecognizer:UIGestureRecognizer *];
    [self.view addGestureRecognizzer:UIGestureRecognizer *];

一个手势只能对应一个View，但是一个View可以有多个手势

1.UITapGestureRecognizer 点按手势区分单击双击

• 创建手势并区分单双击

    //  单击
    UITapGestureRecognizer *singleTapGes = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(singleTapGesAction:)];
    [self.view addGestureRecognizer:singleTapGes];  //  添加到视图上
  
    //  双击
    UITapGestureRecognizer *doubleTapGes = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(doubleTapGesAction:)];
    [self.view addGestureRecognizer:doubelTapGes]
    //  单击以外的添加所需的点按次数
    doubleTapGes.numberOfTapsRequired = 2;
    //  区分单双击
    //  单击只有在双击不成立才执行，以此区分单双击
    [tapGes requireGestureRecognizerToFail:doubleTapGes];
    tapGes.delegate = self;
    [self.view addGestureRecognizer:doubelTapGes];
  

• 重要属性

    //  设置点击次数
    tapGesture.numberOfTapsRequired = 1;
  
    //  获取点击位置
    - (void)singleTapGesAction:(UITapGestureRecognizer *)singleTapGes {
        // 从单击得到单击点的位置
        CGPoint point = [singleTapGes locationInView:self.view];
        NSLog(@"%@", NSStringFromCGPoint(point));
    }
  

2.UIPanGestureRecognizer(平移)与3.UISwipeGestureRecognizer(轻扫) 平移与轻扫需区分

• 创建手势并区分平移与轻扫
  • 平移

      //  平移(即拖动)
      UIPanGestureRecognizer *panGes = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panGesAction:)];
      panGes.minimumNumberOfTouches = 1;// 最少手指个数
      panGes.maximumNumberOfTouches = 2;// 最多手指个数
      [self.view addGestureRecognizer:panGes];
    

  • 轻扫

      //  轻扫
      UISwipeGestureRecognizer *swipGes = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipGesAction:)];
      //  轻扫需要添加方向
      swipGes.direction = UISwipeGestureRecognizerDirectionRight;
              UISwipeGestureRecognizerDirectionRight, default 
              UISwipeGestureRecognizerDirectionLeft,
              UISwipeGestureRecognizerDirectionUp,
              UISwipeGestureRecognizerDirectionDown
      //  区分平移和轻扫
      //  轻扫只有在平移不执行才执行，以此区分平移和轻扫    
      [panGes requireGestureRecognizerToFail:swipGes];
      [self.view addGestureRecognizer:swipGes];
    

• 重要属性

  • 轻扫

      //  设置轻扫方向    
      swipGes.direction = UISwipeGestureRecognizerDirection;
    
      //  获取轻扫手势方向
      - (void)swipGesAction:(UISwipeGestureRecognizer *)swipGes {
          NSLog(@"轻扫方向%lu", (unsigned long)swipGes.direction);
      }
    

  • 平移

      //  获取平移的坐标
      //  移动事件函数，只要手指坐标在屏幕上发生变化时，函数就会被调用
      - (void)panGesAction:(UIPanGestureRecognizer *)panGes {
          //  获取移动的坐标，
          CGPoint pt = [panGes translationInView:self.view];
          //  获取移动时的相对速度
          CGPoint pv = [panGes velocityInView:self.view];
          NSLog(@"pv.x = %.2f, pv.y = %.2f", pv.x, pv.y);
      }
    

4.UILongPressGestureRecognizer(长按)

• 创建手势

    //  长按
    UILongPressGestureRecognizer *longPressGes = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressGesAction:)];
    //  长按需要添加时间;Default is 0.5
    longPressGes.minimumPressDuration = 2.0;
    //  长按时候，手指头可以移动距离;Default is 10
    longPressGes.allowableMovement = 30;
    //  需要点击的次数;Default is 0
    longPressGes.numberOfTapsRequired = 3;
    //  需要几根手指头;Default is 1
    longPressGes.numberOfTouchesRequired = 3;
    [self.view addGestureRecognizer:longPressGes];
  

• 重要属性

    //  设置重要属性
    //  长按需要添加时间;Default is 0.5
    longPressGes.minimumPressDuration = 2.0;
    //  长按时候，手指头可以移动距离;Default is 10
    longPressGes.allowableMovement = 30;
    //  需要点击的次数;Default is 0
    longPressGes.numberOfTapsRequired = 3;
    //  需要几根手指头;Default is 1
    longPressGes.numberOfTouchesRequired = 3;
  
    // 长按触发事件
    // 长按手势的事件会在你开始长按的时候走一次，然后还会在你松开的时候走一次,所以判断在开始的时候写入需求
    - (void)longPressGesAction:(UILongPressGestureRecognizer *)longPressGes {
        // 长按状态开始
        if(longPressGes.state == UIGestureRecognizerStateBegan) {
            NSLog(@"长按状态开始");
            }
        } else if(longPressGes.state == UIGestureRecognizerStateChanged) {
            NSLog(@"长按状态改变");
        } else {
            NSLog(@"长按状态结束");
        }
  

  5.UIPinchGestureRecognizer(捏合)

• 创建手势

    UIPinchGestureRecognizer *pinchGes = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchGesAction:)];
    [self.redView addGestureRecognizer:pinchGes];
  

• 重要属性

    - (void)pinchGesAction:(UIPinchGestureRecognizer *)pinchGes {
        //  缩放比例
        CGFloat scale = pinchGes.scale;
        //  缩放速度
        CGFloat velocity = pinchGes.velocity;
        //  获取捏合手势的视图进行视图操作
        UIView *view = pinchGes.view;
        view.transform = CGAffineTransformScale(view.transform, scale, scale); //  第一个参数视图的transform，第二个参数X轴缩放比例，第三个参数Y轴缩放比例
        //每次捏合动作完毕之后，让此捏合值复原，使得它每次都是从100%开始缩放
        pinchGes.scale = 1;
    }
  

  5.UIRotationGestureRecognizer(旋转)

• 创建手势

    UIRotationGestureRecognizer *rotationGestureRecognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationGesAction:)];
    [self.redView addGestureRecognizer:rotationGestureRecognizer];
  

• 重要属性

    - (void)rotationGesAction:(UIRotationGestureRecognizer *)rotationGes {
  
        //  旋转角度
        CGFloat rotation = rotationGes.rotation;
        //  弧度/秒的缩放速度
        CGFloat velocity = rotationGes.velocity;
        UIView *view = rotationGes.view;
  
        //  视图处理
        view.transform = CGAffineTransformRotate(view.transform, rotation);
        //  复原
        rotationGes.rotation = 0;
    }
  

  UIScreenEdgePanGestureRecognizer(边缘轻扫)

• 创建手势

    UIScreenEdgePanGestureRecognizer *screenEdgePanGes = [[UIScreenEdgePanGestureRecognizer alloc] initWithTarget:self action:@selector(screenEdgePanGesAction:)];
    screenEdgePanGes.edges = UIRectEdgeRight;  //  滑动起点为右边缘
                    typedef NS_OPTIONS(NSUInteger, UIRectEdge) {
                    UIRectEdgeNone   = 0,
                    UIRectEdgeTop    = 1 << 0,
                    UIRectEdgeLeft   = 1 << 1,
                    UIRectEdgeBottom = 1 << 2,
                    UIRectEdgeRight  = 1 << 3,    
                    UIRectEdgeAll    = UIRectEdgeTop | UIRectEdgeLeft | UIRectEdgeBottom | UIRectEdgeRight
                    }
    [self.view addGestureRecognizer:screenEdgePanGes];
  

• 触发方法

    - (void)screenEdgePanGesAction:(UIScreenEdgePanGestureRecognizer *)screenEdgePanGes {
        //  手势的起始边缘
        UIRectEdge edge = screenEdgePanGes.edges;
    }
  

常用手势代理

• 用于是否关闭手势

    -(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
        if ([NSStringFromClass([touch.view class]) isEqualToString:@"UITableViewCellContentView"]) {  //判断如果点击的是tableView的cell，就把手势给关闭了
            return NO;//关闭手势
        }//否则手势存在
       return YES;
    }
  

• 用于多个手势可以同时响应

    - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
      // 返回值为YES的时候，当执行一个手势的操作的时候，也可以执行其他手势的操作
      return YES;
    }
  

  当手势和UITabelView共存可能产生冲突

• 解决方法-->利用手势的代理

     //  1.添加手势，手势的代理
     UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapAction:)];
    tap.delegate = self;
    [self.view addGestureRecognizer:tap];
  
    // 2.执行代理
    #pragma mark - UIGestureRecognizerDelegate
    -(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
        if ([NSStringFromClass([touch.view class]) isEqualToString:@"UITableViewCellContentView"]) {  //  判断如果点击的是tableView的cell，就把手势给关闭了
        return NO;  //  关闭手势
        }  
        return YES;  //  手势存在
    }
  

  冲突总结（后期补充）

• 冲突：tableview

• 不冲突：button,textField

手势不执行方法的可能原因

• 没有添加到视图上
• 视图没有打开视图交互
• 缺少设置手势需要的条件
• 多种手势没有区分