iOS轻扫手势（Swipe）

//抽象类 特点 不能创建对象

    UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(imageViewroSwipe:)];

    swipe.delegate = self;

    //往右或往左轻扫

    swipe.direction = UISwipeGestureRecognizerDirectionUp;//向上

    swipe1.direction = UISwipeGestureRecognizerDirectionDown;//向下

    swipe1.numberOfTouchesRequired = 1;

    //手势View 对象 添加给UIImageView

    [self.imgView addGestureRecognizer:swipe];

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