1. UISwipeGestureRecognizer（轻扫）基本介绍

• 父类是UIGestureRecognizer
• 默认轻扫方向是向右轻扫

2. UISwipeGestureRecognizer应用举例

// 轻扫
- (void)setUpSwipe
{
    // 轻扫
    // 一个手势只能支持一个方向
    UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe:)];
    // 轻扫方向:默认是右边
    swipe.direction = UISwipeGestureRecognizerDirectionUp;

    [self.imageView addGestureRecognizer:swipe];

    UISwipeGestureRecognizer *swipeD = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe:)];
    // 轻扫方向:下边
    swipeD.direction = UISwipeGestureRecognizerDirectionDown;

    [self.imageView addGestureRecognizer:swipeD];

}

- (void)swipe:(UISwipeGestureRecognizer *)swipe
{
    if (swipe.direction == UISwipeGestureRecognizerDirectionDown) {
        NSLog(@"下");
    }else{

    }

}

3. UISwipeGestureRecognizer属性

// 要求的轻扫手指数量，默认是1
@property(nonatomic) NSUInteger                        numberOfTouchesRequired __TVOS_PROHIBITED;

// 轻扫方向，默认是向右
@property(nonatomic) UISwipeGestureRecognizerDirection direction;