如何在iOS中处理1到3个手指的滑动手势

Question

我在代码中使用以下代码来处理 1 根手指滑动：

UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleViewsSwipe:)];
    [swipe setDirection:UISwipeGestureRecognizerDirectionLeft];
    [swipe setDelaysTouchesBegan:YES];
    [[self view] addGestureRecognizer:swipe];

我知道我可以添加以下行以使其处理 2 根手指滑动：

 [swipe setNumberOfTouchesRequired:2];

但是，当我添加上述代码时，由于所需的触摸次数，不再检测到 1 根手指滑动现在是 2。我该怎么做才能使我的代码适用于 1、2 或 3 根手指的滑动？

我尝试使用以下代码，但这并没有达到我想要的效果。

UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handleViewsSwipe:)];
    [panRecognizer setMinimumNumberOfTouches:1];
    [panRecognizer setMaximumNumberOfTouches:3];
    [panRecognizer setDelaysTouchesBegan:YES];
    [[self view] addGestureRecognizer:panRecognizer];
    [panRecognizer release];

谢谢。

Answer 1

在你的handleViewsSwipe中，你可以从手势识别器获取numberOfTouches属性。

- (void)handleViewsSwipe:(UISwipeGestureRecognizer *)recognizer {
    NSUInteger touches = recognizer.numberOfTouches;
    switch (touches) {
        case 1:
            break;
        case 2:
            break;
        case 3:
            break;
        default:
            break;
    }
}

只需根据您获得的触摸次数切换相同的方法来执行操作即可。

Answer 2

将三个滑动手势识别器添加到您的视图中：

for (int i = 1; i <= 3; ++i) {
    UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleViewsSwipe:)];
    swipe.numberOfTouchesRequired = i;
    swipe.direction = UISwipeGestureRecognizerDirectionLeft;
    swipe.delaysTouchesBegan = YES;
    [self.view addGestureRecognizer:swipe];
}

对我有用。