Question

我有以下UIGestureRecognizer检测到正确滑动

- (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];

它不再响应向上滑动（向左或向右滑动）。我究竟做错了什么？（试过模拟器，iphone5，ipad3）

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。感谢。

Answer 1

试试这种方式

    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];

修改

As @ LearnCocos2D suggested“显然每个UISwipeGestureRecognizer都只能检测到给定方向的滑动。即使方向标志可以被”或“在一起，UISwipeGestureRecognizer也会忽略其他标志。 “

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。”，你只需要检测滑动而不是方向，因此将右 - 左和上 - 下组合，因为其他手势将起作用。

Answer 2

swipeGesture是discree手势，上下滑动是两种不同的手势。您必须创建4个手势并将其发送到一个动作。

- (void) addGestureRecognizer {
    UISwipeGestureRecognizer *swipeLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(didSwipe:)];
    [swipeLeft setDirection:UISwipeGestureRecognizerDirectionLeft];
    [swipeLeft setDelegate:self];
    [self.view addGestureRecognizer:swipeLeft];

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

}

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

UISwipeGestureRecognizer没有响应Up

2 个答案: