spritekit + swift, change scene doesnot work good - swift

Question

I'm new to SpriteKit, and I'm following some tutorial, but I got a problem which does not mentioned in the tutorial.
Here is what I'm gonna do, when I touch the screen each time, the scene changes from A to B, and repeat.
I have GameScene.swift and MenuScene.swift, almost the same code.
(Xcode version 7.3.1)
GameScene.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) {
}
}
MenuScene.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) {
}
}
The problem is when I ran the code, it displayed the blue background and the text "hello world", which is what I expected, and I touched the screen, the background changed to red, but the text disappeared, then I touched again, the background changed back to blue, but the text is still disappeared, I could not find out why?

Answer 1

You need to set size of the scene and scale mode. Try this code:
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) {
}
}
and
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) {
}
}