iphone - UISwipeGestureRecognizerDirection 问题

Question

在 viewDidLoad 中我设置:

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

-(void)handleSwipeFrom:(UISwipeGestureRecognizer *)recognizer {
    NSLog(@"Swipe received.");
    UISwipeGestureRecognizerDirection temp = recognizer.direction;
    if (recognizer.direction == UISwipeGestureRecognizerDirectionLeft)
    {
        [self backCalendarPressed:nil];
    }
    else if (recognizer.direction == UISwipeGestureRecognizerDirectionRight)
    {
        [self nextCalendarPressed:nil];
    }
}

但 recognizer.direction 始终等于“3”。 这就是为什么我无法确定它是向左还是向右滑动的原因。

Answer 1

如果你想区分左右手势，你必须为每个方向设置一个单独的手势识别器。 direction 属性仅提供您设置为允许的方向(3 = 两个方向)。 您可以为两者提供相同的目标方法，并在该方法中询问识别器的方向。