iOS手势总结

手势并发执行的方法

1. 设置手势的delegate;实现代理方法
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer;

手势的优先级设定

当识别为gesture01时不会立刻触发gesture01,而是检测gesture02是否成功，如果gesture02检测失败后再触发gesture01，达到解决冲突的结果。
[gesture01 requireGestureRecognizerToFail:gesture02];

点按手势 UITapGestureRecognizer

1. 创建手势
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tap:)];
2. 设置手势属性(可省略)
tap.numberOfTapsRequired = 1; 需要点击的次数,默认是1.
tap.numberOfTouchesRequired = 1; 需要点击的手指数,默认是1.
[tap requireGestureRecoginzerToFail:doubleTap]; doubleTap是自定义的一个双击事件.使用这个方法可以取消掉单击和双击事件并存的情况.
3. 添加手势
[self.imgView addGestureRecognizer:tap];
4. 实现方法
- (void)tap:(UITapGestureRecoginzer *)tapGestureRecognizer{
    // 点击后执行的方法
}

长按手势 UILongPressGestureRecognizer

1. 创建手势
UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPress:)];
2. 设置属性
longPress.minimumPressDuration = 0.5; 至少0.5秒后触发
3. 添加手势
[self.imgView addGestureRecognizer:longPress];
4. 实现方法 与状态配合实现
- (void)longPress:(UILongPressGestureRecognizer *)longPressGesture {
    if(longPressGesture.state == UIGestureRecognizerStateBegan) {
        // 长按手势开始
    }
    if(longPressGesture.state == UIGestureRecognizerStateChanged) {
        // 长按手势 手指位置变化
    }
    if(longPressGesture.state == UIGestureRecognizerStateFailed) {
      // 手势识别失败，恢复默认状态
    }
    if(longPressGesture.state == UIGestureRecognizerStateCancelled) {
        // 手势取消，恢复默认状态
    }
    if(longPressGesture.state == UIGestureRecognizerStateRecognized) {
        // 手势状态已响应
    }
    if(longPressGesture.state == UIGestureRecognizerStateEnded) {
        // 长按手势 状态结束
    }
}

轻扫手势，滑动 UISwipeGestureRecognizer

创建手势,滑动手势有四个方向，如果处理方法相同则可以使用“按位或 | ”设置滑动方向，若处理方法不同则需要创建多个对象添加
UISwipeGestureRecognizer *swipe01 = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe:)];
swipe01.direction = UISwipeGestureRecognizerDirectionDown;
设置手势的优先级用来解决冲突
[swipe requireGestureRecoginzerToFail:pan];
[self.imgView addGestureRecognizer: swipe01];

UISwipeGestureRecognizer *swipe02 = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe:)];
swipe02.direction = UISwipeGestureRecognizerDirectionUp;
[self.imgView addGestureRecognizer: swipe02];

UISwipeGestureRecognizer *swipe03 = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe:)];
swipe03.direction = UISwipeGestureRecognizerDirectionLeft | UISwipeGestureRecognizerDirectionRight;
[self.imgView addGestureRecognizer: swipe03];

实现方法
typedef NS_OPTIONS(NSUInteger, UISwipeGestureRecognizerDirection) {
    UISwipeGestureRecognizerDirectionRight = 1 << 0,
    UISwipeGestureRecognizerDirectionLeft  = 1 << 1,
    UISwipeGestureRecognizerDirectionUp    = 1 << 2,
    UISwipeGestureRecognizerDirectionDown  = 1 << 3
};
- (void)swipe:(UISwipeGestureRecognizer *)swipeGesture {
    // 判断方向实现不同方法 向左向右不能执行因为状态为：3;
    if(swipeGesture.direction == UISwipeGestureRecognizerDirectionLeft) {
        // 向左滑动
    }
    if(swipeGesture.direction == UISwipeGestureRecognizerDirectionRight) {
        // 向右滑动
    }
    if(swipeGesture.direction == UISwipeGestureRecognizerDirectionUp) {
        // 向上滑动
    }
    if(swipeGesture.direction == UISwipeGestureRecognizerDirectionDown) {
        // 向下滑动
    }
}

拖动手势 UIPanGestureRecognizer

1. 创建手势
UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(pan:)];
2. 添加手势
[self.imgView addGestureRecognizer:pan];
3. 实现方法
- (void)pan:(UIPanGestureRecognizer *)pan {
    1. localInView 是触摸点在View的位置
    2. translationInView 是点位移的位置
    3. 手势.view 是手势添加在View身上
    CGPoint translation = [pan translationInView:pan.view];
    CGPoint center = pan.view.center;
    center.x = center.x + translation.x;
    center.y = center.y + translation.y;
    pan.view.center = center;
    
    // 复位
    [pan setTranslation:CGPointZero inView:pan.view];
}

旋转手势 UIRotationGestureRecognizer

1. 创建手势
UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotation:)];
2. 添加手势
[self.imgView addGestureRecognizer:rotation];
3. 实现方法
- (void)rotation:(UIRotationGestureRecognizer *)rotationGesture {
    //获取旋转的角度
    CGFloat scale = rotationGesture.rotation;
    // 设置view的角度,使用transform设置
    rotationGesture.view.transform = CGAffineTransformRotate(rotationGesture.view.transform, scale);
    
    // 复位
    rotationGesture.rotation = 0;
}

捏合手势 缩放 UIPinchGestureRecognizer

1. 创建手势
UIPinchGestureRecognizer *pinch = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(pinch:)];
2. 添加手势
[self.imgView addGestureRecognizer:pinch];
3. 实现方法
- (void)pinch:(UIPinchGestureRecognizer *)pinchGesture {
    //获取缩放值
    CGFloat scale = pinchGesture.scale;
    // 设置值
    pinchGesture.view.transform = CGAffineTransformScale(pinchGesture.view.transform, scale, scale);
    // 复位
    pinchGesture.scale = 1;
}

屏幕边缘滑动手势 UIScreenEdgePanGestureRecognizer

screenEdgePan是UIPanGestureRecognizer的子类，用法相同，不过screenEdgePan是专用于响应从屏幕边缘滑动的效果。
可设置四个方向的效果.
screenEdgePan.edges = UIRectEdgeAll;
screenEdgePan.edges = UIRectEdgeLeft | UIRectEdgeRight;