在SpriteKit Swift中移动相机

Question

我正在使用swift在sprite kit中创建一个游戏,我试图用手指移动SKScene,因为并非所有节点都适合场景.我已经使用此代码创建了世界,叠加和相机节点.

        override func didMoveToView(view: SKView) {
    world = self.childNodeWithName("world")!

    if !isCreated {
        isCreated = true

        // Camera setup
        self.anchorPoint = CGPoint(x: 0.5, y: 0.5)
        self.world = SKNode()
        self.world.name = "world"
        addChild(self.world)

        self.cam = SKNode()
        self.cam.name = "camera"
        self.world.addChild(self.cam)

        // UI setup
        self.overlay = SKNode()
        self.overlay.zPosition = 10
        self.overlay.name = "overlay"
        addChild(self.overlay)
    }

我希望能够用一根手指使用平移手势来移动相机.我该怎么做？任何帮助,将不胜感激.

Answer 1

作为@Kris解决方案（基于UIKit）的替代方法，您还可以使用SKScene子类监视Sprite Kit中的触摸。我写了一个小样本，应该为您指明正确的方向。

class YourSceneSubclass : SKScene
{  
  override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) {
    guard let touch = touches.first else {
      return
    }

    let location = touch.locationInNode(self)
    let previousLocation = touch.previousLocationInNode(self)

    camera?.position.x += location.x - previousLocation.x
    camera?.position.y += location.y - previousLocation.y
  }
}

我没有运行它，只是在操场上写了它。还要注意，如果您还想处理其他敲击/手势，则必须编写其他代码，以确保识别能够在所有预期的情况下正常工作。

Answer 2

如果有人需要，这是一个多合一的解决方案：

class GameScene: SKScene {

  var previousCameraPoint = CGPoint.zero

  override func didMove(to view: SKView) {
    let panGesture = UIPanGestureRecognizer()
    panGesture.addTarget(self, action: #selector(panGestureAction(_:)))
    view?.addGestureRecognizer(panGesture)
  }

  @objc func panGestureAction(_ sender: UIPanGestureRecognizer) {
    // The camera has a weak reference, so test it
    guard let camera = self.camera else {
      return
    }
    // If the movement just began, save the first camera position
    if sender.state == .began {
      previousCameraPoint = camera.position
    }
    // Perform the translation
    let translation = sender.translation(in: self.view)
    let newPosition = CGPoint(
      x: previousCameraPoint.x + translation.x * -1,
      y: previousCameraPoint.y + translation.y
    )
    camera.position = newPosition
  }

}