ios - UISwipeGestureRecognizer 不响应向上

Question

我有以下 UIGestureRecognizer 可以正确检测向上滑动

- (void) addGestureRecognizer {
    _swipeRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(didSwipe:)];
    [_swipeRecognizer setDirection:UISwipeGestureRecognizerDirectionUp];
    [_swipeRecognizer setDelegate:self];
    [self.view addGestureRecognizer:_swipeRecognizer];
}

- (void) didSwipe:(id)sender{
    NSLog(@"didSwipe");
}

然后我修改了方向以包括左和右

[_swipeRecognizer setDirection:UISwipeGestureRecognizerDirectionUp|UISwipeGestureRecognizerDirectionLeft|UISwipeGestureRecognizerDirectionRight];

并且它不再响应向上滑动(向左或向右滑动有效)。我究竟做错了什么？ (在模拟器、iphone5、ipad3上试过)

注意:我不需要检测滑动的实际方向。我只需要知道有一个滑动。谢谢。

Answer 1

试试这个

    UISwipeGestureRecognizer *_swipeRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(didSwipe:)];
    [_swipeRecognizer setDirection:UISwipeGestureRecognizerDirectionLeft|UISwipeGestureRecognizerDirectionRight];
    [_swipeRecognizer setDelegate:self];
    [self.view addGestureRecognizer:_swipeRecognizer];

    _swipeRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(didSwipe:)];
    [_swipeRecognizer setDirection:UISwipeGestureRecognizerDirectionUp|UISwipeGestureRecognizerDirectionDown];
    [_swipeRecognizer setDelegate:self];
    [self.view addGestureRecognizer:_swipeRecognizer];

编辑

作为@LearnCocos2D suggested “显然，每个 UISwipeGestureRecognizer 只能检测给定方向上的滑动。即使可以将方向标志“或”在一起，UISwipeGestureRecognizer 也会忽略其他标志。 “

并且根据您的“注意:我不需要检测滑动的实际方向。我只需要知道有滑动。”，您只需要检测滑动而不是方向，因此将左右组合为一个，将上下组合为其他手势即可。