將手勢識別器添加到SKShapeNode Swift 4

Question

我希望當用戶在SKShapeNode上向上滾動時執行一個函數。

我可以使用以下代碼針對整個視圖進行操作：

let swipeUp:UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: Selector("swipedUp:"))
swipeUp.direction = .up
view?.addGestureRecognizer(swipeUp);

我如何修改此代碼以使其可用於SKShapeNode。 謝謝

Answer 1

通常，您不能將手勢識別器添加到SKScene的實例，因為該類不是UIKit一部分。 但是，由於已將手勢識別器添加到視圖中，因此可以使用單獨的處理程序方法來響應滑動手勢。

override func didMove(to view: SKView) {
    let swipeUpGestureRecognizer = UISwipeGestureRecognizer(target: self, action: #selector(self.handleSwipeFrom))
    self.view!.addGestureRecognizer(swipeUpGestureRecognizer)
}

@objc func handleSwipeFrom(_ recognizer: UISwipeGestureRecognizer) {
    switch recognizer.state {
    case .changed:
        if recognizer.direction == .up {
            let touchInView = recognizer.location(in: recognizer.view)
            let touch = convertPoint(fromView: touchInView)
            let nodeArray = nodes(at: touch)
            for node in nodeArray {
                if node.name == "my shape node" {
                    // You've got a reference to your shape node and can take some action here (add movement or whatever)
                }
            }
        }
    default:
        return
    }
}