SpriteKit：移动整个场景

Question

我想为场景添加特定数量的方块。当我这样做时，广场的一部分在视野外。是否有可能在y轴上移动整个场景？

Answer 1

我试过了，它看起来像场景本身不能移动。一种替代方法是将SKNode添加到代表整个世界的场景中。将所有其他元素添加到世界节点。现在，如果要移动整个场景，则可以移动此节点。我正在撰写关于我的博客的简短教程。这里是我当前的代码：

import SpriteKit 

class GameScene: SKScene { 

// Declare the needed nodes 
var worldNode: SKNode? 
var spriteNode: SKSpriteNode? 
var nodeWidth: CGFloat = 0.0 

override func didMoveToView(view: SKView) { 

    // Setup world 
    worldNode = SKNode() 
    self.addChild(worldNode!) 

    // Setup sprite 
    spriteNode = SKSpriteNode(imageNamed: "Spaceship") 
    spriteNode?.position = CGPoint(x:CGRectGetMidX(self.frame), y:CGRectGetMidY(self.frame)) 
    spriteNode?.xScale = 0.1 
    spriteNode?.yScale = 0.1 
    spriteNode?.zPosition = 10 
    self.addChild(spriteNode!) 

    // Setup backgrounds 
    // Image of left and right node must be identical 
    let leftNode = SKSpriteNode(imageNamed: "left") 
    let middleNode = SKSpriteNode(imageNamed: "right") 
    let rightNode = SKSpriteNode(imageNamed: "left") 

    nodeWidth = leftNode.frame.size.width 

    leftNode.anchorPoint = CGPoint(x: 0, y: 0) 
    leftNode.position = CGPoint(x: 0, y: 0) 
    middleNode.anchorPoint = CGPoint(x: 0, y: 0) 
    middleNode.position = CGPoint(x: nodeWidth, y: 0) 
    rightNode.anchorPoint = CGPoint(x: 0, y: 0) 
    rightNode.position = CGPoint(x: nodeWidth * 2, y: 0) 

    worldNode!.addChild(leftNode) 
    worldNode!.addChild(rightNode) 
    worldNode!.addChild(middleNode) 


} 


var xOrgPosition: CGFloat = 0 
override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) { 

    for touch in touches { 

     let xTouchPosition = touch.locationInNode(self).x 
     if xOrgPosition != 0.0 { 
      let xNewPosition = worldNode!.position.x + (xOrgPosition - xTouchPosition) 

      if xNewPosition <= -(2 * nodeWidth) { 
       // right end reached 
       worldNode!.position = CGPoint(x: 0, y: 0) 
       print("Right end reached") 
      } else if xNewPosition >= 0 { 
       // left end reached 
       worldNode!.position = CGPoint(x: -(2 * nodeWidth), y: 0) 
       print("Left end reached") 
      } else { 

       worldNode!.position = CGPoint(x: xNewPosition, y: 0) 
      } 
     } 
     xOrgPosition = xTouchPosition 
    } 
} 

override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) { 
    // Reset value for the next swipe gesture 
    xOrgPosition = 0 
} 

override func update(currentTime: CFTimeInterval) { 
    /* Called before each frame is rendered */ 
} 

}