swift - 是否可以更新 SKLabelNode？

Question

我正在尝试更新 coinLabel，以便当点击“life”节点时，它将更新 SKLabelNode 并在从总数中减去硬币后显示正确的硬币。我是编码新手，所以如果还有其他问题，请回复!谢谢!

import Foundation
import SpriteKit

class ShopScene: SKScene {

override func didMove(to view: SKView) {


    let background = SKSpriteNode(imageNamed: "background")
    background.size = self.size
    background.position = CGPoint(x: self.size.width/2, y: self.size.height/2)
    background.zPosition = 0
    self.addChild(background)

    let mainMenu = SKLabelNode(fontNamed: "The Bold Font")
    mainMenu.text = "Main Menu"
    mainMenu.fontSize = 100
    mainMenu.fontColor = SKColor.darkGray
    mainMenu.position = CGPoint(x: self.size.width*0.5, y: self.size.height*0.3)
    mainMenu.zPosition = 1
    mainMenu.name = "Main Menu"
    self.addChild(mainMenu)

    let Life = SKLabelNode(fontNamed: "The Bold Font")
    Life.text = "Click here to buy 1 life!"
    Life.fontSize = 130
    Life.fontColor = SKColor.darkGray
    Life.position = CGPoint(x: self.size.width*0.5, y: self.size.height*0.6)
    Life.zPosition = 1
    Life.name = "Life"
    self.addChild(Life)

    let coinLabel = SKLabelNode(fontNamed: "The Bold Font")
    coinLabel.text = "Coins: \(coinNumber)"
    coinLabel.fontSize = 100
    coinLabel.fontColor = SKColor.black
    coinLabel.zPosition = 1
    coinLabel.position = CGPoint(x: self.size.width/2, y: self.size.height*0.1)
    self.addChild(coinLabel)



}


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


    for touch: AnyObject in touches {

        let pointOfTouch = touch.location(in: self)
        let nodeITapped = atPoint(pointOfTouch)

        if nodeITapped.name == "Main Menu" {


            let sceneToMoveTo = MainMenuScene(size: self.size)
            sceneToMoveTo.scaleMode = self.scaleMode
            let myTrasition = SKTransition.fade(withDuration: 0.5)
            self.view!.presentScene(sceneToMoveTo, transition: myTrasition)
        }

            if nodeITapped.name == "Life" {
                if coinNumber > 10 {
                lifeNumber += 1
                coinNumber -= 10
                defaults.set(coinNumber, forKey: "coinNumberSaved")
                defaults.set(lifeNumber, forKey: "lifeNumberSaved")


                return

                }


            }
        }


    }


}

Answer 1

只需再次更新点击识别器中的文本即可进行更改

coinLabel.text = "Coins: \(coinNumber)"

您需要确保在 init 之外有一个 coinLabel 的引用，以便您可以在其之外操作它。在 ShopScene 的顶部，您可以执行以下操作...

class ShopScene: SKScene {
var coinLabel = SKLabelNode()
//your code
}

然后当你在 didMove(to view:) 函数中进入 init 时，请执行...

 coinLabel = SKLabelNode(fontNamed: "The Bold Font")

这样您就可以在整个代码中引用它。尽管将来您会考虑创建 SKNode 的子类来处理所有 UI 元素，这样您就不必初始化 GameScene 中的所有内容。