Swift UISwipeGestureRecognizer 如何检测对角线滑动？

Question

我需要检测所有向左滑动和向右滑动的滑动，包括向上滑动。我的意思是我需要检测 180 度区域中的所有滑动，我不确定我是否足够清楚。当我添加 .up .right 和 .left 时，它没有检测到对角线，例如左上，我该怎么办？谢谢！

Answer 1

UIPanGestureRecognizer 是实现此目的的方法：

private var panRec: UIPanGestureRecognizer!
private var lastSwipeBeginningPoint: CGPoint?

override func viewDidLoad() {
    panRec = UIPanGestureRecognizer(target: self, action: #selector(ViewController.handlePan(recognizer:)))
    self.view.addGestureRecognizer(panRec)
}

func handlePan(recognizer: UISwipeGestureRecognizer) {
    if recognizer.state == .began {
        lastSwipeBeginningPoint = recognizer.location(in: recognizer.view)
    } else if recognizer.state == .ended {
        guard let beginPoint = lastSwipeBeginningPoint else {
            return
        }
        let endPoint = recognizer.location(in: recognizer.view)
        // TODO: use the x and y coordinates of endPoint and beginPoint to determine which direction the swipe occurred. 
    }
}

Swift UISwipeGestureRecognizer 如何检测对角线滑动？

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