Swift UISwipeGestureRecognizer如何檢測對角線滑動？

Question

我需要檢測所有的左滑動和右滑動包括向上滑動。我的意思是我需要檢測180度區域內的所有揮杆動作，我不確定是否足夠清晰。當我添加.up .right和.left時，它沒有檢測到左對角線等對角線，我應該怎麼做？謝謝！

Answer 1

UIPanGestureRecognizer是去這樣的方式：你應該嘗試PanGestureRecognizer

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. 
    } 
}