Xcode 更改场景后节点不移动

我做了一个（基本的）游戏，工作完美，进入游戏场景，当它从游戏场景回到游戏场景时，玩家（Spritode）不再移动

我在游戏场景代码中评论了它的功能

我没有从Xcode得到任何错误

该bug位于gamescene.swift文件中（功能：swipedRight+swipedLeft+swipedUp+swipedDown）：

gameviewcontroller文件：

import UIKit
import SpriteKit
import AVFoundation

class GameViewController: UIViewController, UITextFieldDelegate{

var scene:GameScene!

func swipedRight(sender: UISwipeGestureRecognizer){
    scene.swipedRight1(sender)
}

func swipedLeft(sender: UISwipeGestureRecognizer){
    scene.swipedLeft1(sender)
}
func swipedDown(sender: UISwipeGestureRecognizer){
    scene.swipedDown1(sender)
}
func swipedUp(sender: UISwipeGestureRecognizer){
    scene.swipedUp1(sender)
}

override func viewDidLoad() {
    super.viewDidLoad()
   let skView = view as SKView
    skView.multipleTouchEnabled = false
    scene = GameScene(size: skView.bounds.size)
    scene.scaleMode = SKSceneScaleMode.AspectFill
    skView.presentScene(scene)
  let swipeRight:UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: Selector("swipedRight:"))
    swipeRight.direction = .Right
    view.addGestureRecognizer(swipeRight)
    let swipeLeft:UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: Selector("swipedLeft:"))
    swipeLeft.direction = .Left
    view.addGestureRecognizer(swipeLeft)
     let swipeUp:UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: Selector("swipedUp:"))
    swipeUp.direction = .Up
    view.addGestureRecognizer(swipeUp)
    let swipeDown:UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: Selector("swipedDown:"))
    swipeDown.direction = .Down
    view.addGestureRecognizer(swipeDown)
}

override func prefersStatusBarHidden() -> Bool {
    return true
}
}

---

您在错误的场景中调用了

swipedUp1

（etc）方法。下面是正在发生的事情：

视图控制器有一个对您开始使用的

游戏场景

实例的引用。它的手势和动作方法就是如此，一切都很好

从

GameOverScene

启动新游戏时，将创建

GameScene

的新实例并将其显示在视图中。现在您有了两个

游戏场景的实例：视图控制器仍指向的实例和视图正在渲染的实例

当你使用手势动作开火时，他们仍在与第一个

游戏场景

对话。所以你的日志行会被打印出来，但是你看不到任何事情发生，因为第二个

游戏场景就是正在显示的

不管怎样，你可能不希望有两个场景

您可以通过取消视图控制器中的

scene

属性并让手势动作调用到

view.scene

来解决这两个问题（在适当的施法之后）：

这样，滑动将转到视图控制器的

视图当前显示的任何场景

或者，您可以保留原始的
swipedUp
（etc）代码，并将
场景
从存储属性更改为只读计算属性，以始终获取当前显示的场景：

var scene: GameScene {
    let skView = view as SKView
    return skView.scene as GameScene
}

请通过删除所有不必要的空行来重新格式化代码-一行可以，两行可以，三行或更多行不行。另外，最好至少指定要查找的方法的名称，或者指定要搜索的文本，这样读者就不必逐行滚动代码来查找它。
import UIKit
import SpriteKit
import AVFoundation

class GameViewController: UIViewController, UITextFieldDelegate{

var scene:GameScene!

func swipedRight(sender: UISwipeGestureRecognizer){
    scene.swipedRight1(sender)
}

func swipedLeft(sender: UISwipeGestureRecognizer){
    scene.swipedLeft1(sender)
}
func swipedDown(sender: UISwipeGestureRecognizer){
    scene.swipedDown1(sender)
}
func swipedUp(sender: UISwipeGestureRecognizer){
    scene.swipedUp1(sender)
}

override func viewDidLoad() {
    super.viewDidLoad()
   let skView = view as SKView
    skView.multipleTouchEnabled = false
    scene = GameScene(size: skView.bounds.size)
    scene.scaleMode = SKSceneScaleMode.AspectFill
    skView.presentScene(scene)
  let swipeRight:UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: Selector("swipedRight:"))
    swipeRight.direction = .Right
    view.addGestureRecognizer(swipeRight)
    let swipeLeft:UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: Selector("swipedLeft:"))
    swipeLeft.direction = .Left
    view.addGestureRecognizer(swipeLeft)
     let swipeUp:UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: Selector("swipedUp:"))
    swipeUp.direction = .Up
    view.addGestureRecognizer(swipeUp)
    let swipeDown:UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: Selector("swipedDown:"))
    swipeDown.direction = .Down
    view.addGestureRecognizer(swipeDown)
}

override func prefersStatusBarHidden() -> Bool {
    return true
}
}

func swipedUp(sender: UISwipeGestureRecognizer) {
    let skView = view as SKView
    let gameScene = skView.scene as GameScene
    gameScene.swipedUp1(sender)
}

var scene: GameScene {
    let skView = view as SKView
    return skView.scene as GameScene
}