Question

我有一个主菜单场景，当按下按钮时，它应该转换到另一个场景。它似乎正常转换，但是当它完成转换时，第二个场景是空白的。我在第二个场景的didMove函数中放置了断点，它看起来运行正常。我知道从GameViewController直接打开时第二个场景正常工作。我不确定为什么从另一个场景转换时它是空白的。这是我目前的代码：

class StartScene: SKScene {

  var playButton = SKSpriteNode()
  let playButtonTex = SKTexture(imageNamed: "BlueRoundedButton")

  override func didMove(to view: SKView) {

    playButton = SKSpriteNode(texture: playButtonTex)
    playButton.size = CGSize(width: 200, height: 50)
    playButton.position = CGPoint(x: frame.midX, y: frame.midY)
    self.addChild(playButton)
  }

  override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    if let touch = touches.first {
      let pos = touch.location(in: self)
      let node = self.atPoint(pos)

      if node == playButton {
        if let view = view {
          let transition:SKTransition = SKTransition.fade(withDuration: 1)
          let scene:SKScene = PoolScene(size: self.size)
          self.view?.presentScene(scene, transition: transition)
        }
      }
    }
  }
}

这是转换为：

的场景

class PoolScene: SKScene, SKPhysicsContactDelegate {

  var ballPoke : SKSpriteNode?
  var ballBlue : SKSpriteNode?
  var ballOrange : SKSpriteNode?


  override func didMove(to view: SKView) {

    let borderBody = SKPhysicsBody(edgeLoopFrom: self.frame)
    borderBody.friction = 0
    self.physicsBody = borderBody

    self.physicsWorld.gravity = CGVector(dx: 0, dy: 0)
    physicsWorld.contactDelegate = self

    ballBlue = childNode(withName: blueBallName) as? SKSpriteNode
    ballOrange = childNode(withName: orangeBallName) as? SKSpriteNode
    ballPoke = childNode(withName: pokeBallName) as? SKSpriteNode


    ballBlue?.physicsBody?.categoryBitMask = blueBallCategory
    ballOrange?.physicsBody?.categoryBitMask = orangeBallCategory
    ballPoke?.physicsBody?.categoryBitMask = pokeBallCategory
    borderBody.categoryBitMask = borderCategory


  }

Answer 1

您正在调用错误的init方法来加载PoolScene。你这样做的方法是当你不使用Xcode可视化级别编辑器时。与您的GameViewController一样，您需要通过引用相应的.sks文件来初始化场景。

 if node == playButton {
     if let view = view {
        let transition = SKTransition.fade(withDuration: 1)

         if let scene = PoolScene(fileNamed: "PoolScene") {
              view.presentScene(scene, transition: transition)
         }
      }
  }

或以稍微清洁的方式

  if node == playButton {
     let transition = SKTransition.fade(withDuration: 1)

     if let scene = PoolScene(fileNamed: "PoolScene") {
         view?.presentScene(scene, transition: transition)    
      }
  }

“fileNamed：...”是您的PoolScene的.sks文件的名称，您通常会提供与.swift文件完全相同的名称。使用guard或if let，因为它将返回一个可选项。

作为一个小技巧，请使用swifts类型推断使代码更好一些。

希望这有帮助

Spritekit - 从.sks文件创建的场景在从另一个场景转换时是空白的

1 个答案: