如何在iOS中检测刷卡手势?

使用 UISwipeGestureRecognizer . 其实没什么好说的,手势识别器很简单。有 WWDC10 videos 甚至在这个问题上。第120和121课时。:)

如果你知道它是如何工作的,但仍然需要一个快速的例子,这里是!(至少对我来说,当我需要复制粘贴示例时,它会变得很方便,而不需要尝试记住它)

UISwipeGestureRecognizer *mSwipeUpRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(doSomething)];

[mSwipeUpRecognizer setDirection:(UISwipeGestureRecognizerDirectionUp | UISwipeGestureRecognizerDirectionDown | UISwipeGestureRecognizerDirectionLeft | UISwipeGestureRecognizerDirectionRight)];

[[self view] addGestureRecognizer:mSwipeUpRecognizer];

在.h文件中添加:

<UIGestureRecognizerDelegate>

下面的链接将您重定向到一个视频教程,该教程解释了如何在 目标C :

UISwipeGestureRecognizer Tutorial (Detecting swipes on the iPhone)

下面的代码示例,在 斯威夫特 :

你需要一个 UISwipeGestureRecognizer 每个方向。有点奇怪因为 UISwipeGestureRecognizer.direction 属性是选项样式的位掩码,但每个识别器只能处理一个方向。如果需要,可以将它们全部发送到同一个处理程序,并在那里进行排序,或者将它们发送到不同的处理程序。这里有一个实现:

override func viewDidLoad() {
    super.viewDidLoad()

    var swipeRight = UISwipeGestureRecognizer(target: self, action: "respondToSwipeGesture:")
    swipeRight.direction = UISwipeGestureRecognizerDirection.Right
    self.view.addGestureRecognizer(swipeRight)

    var swipeDown = UISwipeGestureRecognizer(target: self, action: "respondToSwipeGesture:")
    swipeDown.direction = UISwipeGestureRecognizerDirection.Down
    self.view.addGestureRecognizer(swipeDown)
}

func respondToSwipeGesture(gesture: UIGestureRecognizer) {

    if let swipeGesture = gesture as? UISwipeGestureRecognizer {

        switch swipeGesture.direction {
        case UISwipeGestureRecognizerDirection.Right:
            println("Swiped right")
        case UISwipeGestureRecognizerDirection.Down:
            println("Swiped down")
        default:
            break
        }
    }
}