UISwipeGestureRecognizer 滑动手势方向的判定

最新推荐文章于 2025-07-28 14:11:46 发布

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本文介绍了在iOS开发中如何正确地使用UISwipeGestureRecognizer来识别滑动手势的方向，并提供了具体的代码示例。通过创建单独的手势对象分别处理左右滑动，可以避免手势识别错误的问题。

今天根据视频教程写 UISwipeGestureRecognizer 来判断滑动手势的方向时，发现无论怎么滑动，控制总是打印向左滑动，代码如下：

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

但实际上这是一个大大的坑！！！

正确的做法应该是分别创建两个方向的轻扫手势，代码如下：

UISwipeGestureRecognizer* leftSwipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeAct:)];
UISwipeGestureRecognizer* rightSwipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeAct:)];
leftSwipe.direction = UISwipeGestureRecognizerDirectionLeft;
rightSwipe.direction = UISwipeGestureRecognizerDirectionRight;
[iView addGestureRecognizer:leftSwipe];
[iView addGestureRecognizer:rightSwipe];

swipeAct 方法的实现：

- (void)swipeAct:(UISwipeGestureRecognizer*) swipe
{
    if(swipe.direction == UISwipeGestureRecognizerDirectionLeft)
        NSLog(@"向左滑动,%lu",swipe.direction);
    else if(swipe.direction == UISwipeGestureRecognizerDirectionRight)
        NSLog(@"向右滑动,%lu",swipe.direction);
}