009-手势触摸事件处理

#pragma mark - 手势识别器的代理方法
/**
 *  是否允许多个手势识别器同时有效
 *  Simultaneously : 同时地
 */
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    return YES;
}

Ø创建手势识别器对象
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] init];
Ø设置手势识别器对象的具体属性
// 连续敲击2次
tap.numberOfTapsRequired = 2;
// 需要2根手指一起敲击
tap.numberOfTouchesRequired = 2;
Ø添加手势识别器到对应的view上
[self.iconView addGestureRecognizer:tap];
Ø监听手势的触发
[tap addTarget:self action:@selector(tapIconView:)];

#pragma mark - 缩放手势(捏合手势)
- (void)testPinch
{
    UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchView:)];
    pinch.delegate = self;
    [self.iconView addGestureRecognizer:pinch];
}

- (void)pinchView:(UIPinchGestureRecognizer *)pinch
{
    pinch.view.transform = CGAffineTransformScale(pinch.view.transform, pinch.scale, pinch.scale);
    pinch.scale = 1; // 这个真的很重要!!!!!
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panView:)];
    [self.purpleView addGestureRecognizer:pan];
}

- (void)panView:(UIPanGestureRecognizer *)pan
{
    
    switch (pan.state) {
        case UIGestureRecognizerStateBegan: // 开始触发手势
            
            break;
            
        case UIGestureRecognizerStateEnded: // 手势结束
            
            break;
            
        default:

            break;
    }
    // 1.在view上面挪动的距离
    CGPoint translation = [pan translationInView:pan.view];
    CGPoint center = pan.view.center;
    center.x += translation.x;
    center.y += translation.y;
    pan.view.center = center;
    NSLog(@"%@",NSStringFromCGPoint(translation));
    // 2.清空移动的距离
    [pan setTranslation:CGPointZero inView:pan.view];
}

    UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeView)];
    swipe.direction = UISwipeGestureRecognizerDirectionUp;
    [self.redView addGestureRecognizer:swipe];

#pragma mark - 旋转手势
- (void)testRotate
{
    UIRotationGestureRecognizer *recognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotateView:)];
    recognizer.delegate = self;
    [self.iconView addGestureRecognizer:recognizer];
}

- (void)rotateView:(UIRotationGestureRecognizer *)recognizer
{
    recognizer.view.transform = CGAffineTransformRotate(recognizer.view.transform, recognizer.rotation);
    recognizer.rotation = 0; // 这个很重要!!!!!
}

UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] init];
    [longPress addTarget:self action:@selector(longPressView)];
    // 至少长按2秒
    longPress.minimumPressDuration = 2;
    // 在触发手势之前,50px范围内长按有效
    longPress.allowableMovement = 50;
    [self.redView addGestureRecognizer:longPress];