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 {

}

7、旋转+捏合+拖拽

• 7.1 多手势的创建

// 默认情况下,控件只能监听一种手势
// 如果要监听到多个手势,设置代理方法,告知允许多个手势存在

// 旋转
UIRotationGestureRecognizer *rotaitonGest = [[UIRotationGestureRecognizer alloc]initWithTarget:self action:@selector(rotationView:)];
rotaitonGest.delegate =self;
[self.imgView addGestureRecognizer:rotaitonGest];

// 捏合
UIPinchGestureRecognizer *pinchGest = [[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(pinchView:)];
[self.imgView addGestureRecognizer:pinchGest];

// 拖拽
UIPanGestureRecognizer *panGest = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(panView:)];
[self.imgView addGestureRecognizer:panGest];

• 7.2 代理实现

/**
 *  多个手势同时存在的代理
 */
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
    
    return YES;
}

• 7.3 事件处理

- (void)rotationView:(UIRotationGestureRecognizer *)rotationGest { 
    
    // 旋转角度
    // 旋转的角度也一个累加的过程
    NSLog(@"旋转角度 %f",rotationGest.rotation);
    
    // 设置图片的旋转
    self.imgView.transform = CGAffineTransformRotate(self.imgView.transform, rotationGest.rotation);
    
    // 清除 "旋转角度" 的累
    rotationGest.rotation = 0;
    
}

- (void)pinchView:(UIPinchGestureRecognizer *)pinchGest {

    // 设置图片缩放
    self.imgView.transform = CGAffineTransformScale(self.imgView.transform, pinchGest.scale, pinchGest.scale);
    
    // 还原
    pinchGest.scale = 1;
}

- (void)panView:(UIPanGestureRecognizer *)panGest {
    
    // 拖拽的距离(距离是一个累加)
    CGPoint trans = [panGest translationInView:panGest.view];
    NSLog(@"%@",NSStringFromCGPoint(trans));
    
    // 设置图片移动
    CGPoint center =  self.imgView.center;
    center.x += trans.x;
    center.y += trans.y;
    self.imgView.center = center;
    
    // 清除累加的距离
    [panGest setTranslation:CGPointZero inView:panGest.view];
}