Question

我在UIScrollView中有一个UIView demoView 。我想垂直滚动UIScroll视图，不要水平滚动。我将UISwipeGestureRecognizer添加到UIView中。代码是（这里是自己的UIScrollView）：

self.demoView.userInteractionEnabled = YES;
UISwipeGestureRecognizer *rightSwipe = [[UISwipeGestureRecognizer alloc] 
    initWithTarget:self action:@selector(rightSwipeLineChart:)];
rightSwipe.direction = UISwipeGestureRecognizerDirectionRight;
[self.demoView addGestureRecognizer:rightSwipe];

UISwipeGestureRecognizer *leftSwipe = [[UISwipeGestureRecognizer alloc] 
    initWithTarget:self action:@selector(leftSwipeLineChart:)];
[self.demoView addGestureRecognizer:leftSwipe];

结果是我只能检测到左侧滑动手势，无法检测到右侧滑动手势。我的代码出了什么问题？谢谢。

Answer 1

UISwipeGestureRecognizer方向属性的默认值是UISwipeGestureRecognizerDirectionRight，因此您创建了两个执行相同操作的识别器。

这就是我如何解决问题：

for (int i = 0; i < 2; i++) {
    UISwipeGestureRecognizer *swipeRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(onGestureSwipe:)];
    swipeRecognizer.direction = (i == 0 ? UISwipeGestureRecognizerDirectionRight : UISwipeGestureRecognizerDirectionLeft);
    [self.tableView addGestureRecognizer:swipeRecognizer];
}

Answer 2

要检测滑动到UIScrollView或UIWebView很难。您可以使用此处的“Swipe4ScrollViews”： UISwipeGestureRecognizer not working

在UIScrollView中使用UISwipeGestureRecognizer，无法检测到右键滑动，只检测左侧滑动

2 个答案: