swift - spritekit + swift，改变场景效果不好

Question

我是 SpriteKit 的新手，我正在学习一些教程，但是我遇到了教程中没有提到的问题。 这是我要做的，当我每次触摸屏幕时，场景从 A 切换到 B，然后重复。

我有 GameScene.swift 和 MenuScene.swift，几乎相同的代码。 (Xcode 版本 7.3.1) 游戏场景.swift:

import SpriteKit

class GameScene: SKScene {
    override func didMoveToView(view: SKView) {
        createScene()
    }
    
    func createScene() {
        self.backgroundColor = SKColor.blueColor()
        let myLabel = SKLabelNode(fontNamed:"Chalkduster")
        myLabel.name = "label"
        myLabel.text = "Hello, World!"
        myLabel.fontSize = 45
        myLabel.position = CGPoint(x:500, y:300)
        self.addChild(myLabel)
    }

    override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
        let nextScene = MenuScene()
        let doors = SKTransition.doorsOpenVerticalWithDuration(0.5)
        self.view!.presentScene(nextScene, transition: doors)
    }
   
    override func update(currentTime: CFTimeInterval) {

    }
}

菜单场景.swift:

import SpriteKit

class MenuScene: SKScene {
    override func didMoveToView(view: SKView) {
        createScene()
    }
    
    func createScene() {
        self.backgroundColor = SKColor.redColor()
        let myLabel = SKLabelNode(fontNamed:"Chalkduster")
        myLabel.name = "label"
        myLabel.text = "Hello, World!"
        myLabel.fontSize = 45
        myLabel.position = CGPoint(x:500, y:300)
        self.addChild(myLabel)
    }
    
    override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
        let nextScene = GameScene()
        let doors = SKTransition.doorsOpenVerticalWithDuration(0.5)
        self.view!.presentScene(nextScene, transition: doors)
    }
    
    override func update(currentTime: CFTimeInterval) {
        
    }
}

问题是当我运行代码时，它显示了蓝色背景和文本“hello world”，这正是我所期望的，我触摸屏幕，背景变为红色，但文本消失了，然后我再次触摸，背景变回蓝色，但文字仍然消失，我找不到为什么？

Answer 1

您需要设置场景大小和缩放模式。试试这个代码:

import SpriteKit

class MenuScene: SKScene {
override func didMoveToView(view: SKView) {
    createScene()
}

func createScene() {
    self.backgroundColor = SKColor.redColor()
    let myLabel = SKLabelNode(fontNamed:"Chalkduster")
    myLabel.name = "label"
    myLabel.text = "Hello, World!"
    myLabel.fontSize = 45
    myLabel.position = CGPoint(x:500, y:300)
    self.addChild(myLabel)
}

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
    let nextScene = GameScene(size: scene!.size)
    nextScene.scaleMode = .AspectFill
    let doors = SKTransition.doorsOpenVerticalWithDuration(0.5)
    self.view!.presentScene(nextScene, transition: doors)
}

override func update(currentTime: CFTimeInterval) {

}
}

和

import SpriteKit

class GameScene: SKScene {
override func didMoveToView(view: SKView) {
    createScene()
}


func createScene() {
    self.backgroundColor = SKColor.blueColor()
    let myLabel = SKLabelNode(fontNamed:"Chalkduster")
    myLabel.name = "label"
    myLabel.text = "Hello, World!"
    myLabel.fontSize = 45
    myLabel.position = CGPoint(x:500, y:300)
    myLabel.zPosition = 2.0
    self.addChild(myLabel)
    print(myLabel.position)
}

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {

    let nextScene = MenuScene(size: scene!.size)
    nextScene.scaleMode = .AspectFill
    let doors = SKTransition.doorsOpenVerticalWithDuration(0.5)
    self.view!.presentScene(nextScene, transition: doors)
}

override func update(currentTime: CFTimeInterval) {

}
}