iOS手势识别器

UIGestureRecognizer

UIGestureRecognizer类,用于检测、识别用户使用设备时所用的手势.它是一个抽象类,定义了所有手势的基本行为.以下是UIGestureRecognizer子类,用于处理具体的用户手势行为:

UITapGestureRecognizer // 1.单击
UILongPressGestureRecognizer // 3.长按
UISwipeGestureRecognizer // 4.轻扫
UIPanGestureRecognizer // 5.移动
UIRotationGestureRecognizer // 6.旋转
UIPinchGestureRecognizer // 7.捏合

创建手势:

    // 1.单击
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapAction:)];
    [imgView addGestureRecognizer:tap];
    
    // 2.双击
    UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(doubleTapAction:)];
    doubleTap.numberOfTapsRequired = 2;
    [imgView addGestureRecognizer:doubleTap];
    
    // 双击失败才单击
    [tap requireGestureRecognizerToFail:doubleTap];
    
    // 3.长按
    UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressAction:)];
    //设置最短时间
    longPress.minimumPressDuration = 1;
    [imgView addGestureRecognizer:longPress];
    
    
    // 4.轻扫
    UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeAction:)];
    // 设置轻扫方向
    [swipe setDirection:UISwipeGestureRecognizerDirectionRight];
    [imgView addGestureRecognizer:swipe];
    
    // 5.移动
    UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panAction:)];
    [imgView addGestureRecognizer:pan];
    
    // 轻扫失败才移动
    [pan requireGestureRecognizerToFail:swipe];
    
    // 6.旋转
    UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationAction:)];
    [imgView addGestureRecognizer:rotation];
    
    // 7.捏合
    UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchAction:)];
    [imgView addGestureRecognizer:pinch];

手势触发事件：

GestureAction:

-(void)longPressAction:(UILongPressGestureRecognizer *)longPress
{
    if (longPress.state == UIGestureRecognizerStateBegan) {
        NSLog(@"长按开始");
    }else if (longPress.state == UIGestureRecognizerStateEnded){
        NSLog(@"长按结束");
    }
}

- (void)panAction:(UIPanGestureRecognizer *)pan {

    //手指所在的坐标
    CGPoint point = [pan locationInView:self.view];
    _view.center = point;
}

- (void)rotationAction:(UIRotationGestureRecognizer *)rotation
{

    if (rotation.state == UIGestureRecognizerStateChanged) {
        
        //取到弧度
        CGFloat angle = rotation.rotation;
        
        //正在旋转
        rotation.view.transform = CGAffineTransformMakeRotation(angle);
        
    } else if (rotation.state == UIGestureRecognizerStateEnded) {
        
        //还原
        [UIView animateWithDuration:.5 animations:^{
            
            rotation.view.transform = CGAffineTransformIdentity;
        }];
    }
}

- (void)pinchAction:(UIPinchGestureRecognizer *)pinch
{

    if (pinch.state == UIGestureRecognizerStateChanged) {
        
        // 取到缩放比率
        CGFloat scale = pinch.scale;
        
        // 缩放
        pinch.view.transform = CGAffineTransformMakeScale(scale, scale);
        
    } else if (pinch.state == UIGestureRecognizerStateEnded) {
        
        [UIView animateWithDuration:.5 animations:^{
            
            pinch.view.transform = CGAffineTransformIdentity;
        }];
    }
}

Motion 摇晃手势

//让当前对象成为第一响应者
- (BOOL)canBecomeFirstResponder
{
          
   return YES;
}

- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event
{

   NSLog(@"摇一摇开始");
}

- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event
{

   NSLog(@"摇一摇结束");
}

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