背景图像在Swift中不改变

所以基本上我是想让这个应用程序在按下按钮时改变背景。我尝试这样做的方式是设置一个变量0，如果按下按钮，它将使它变小或变大。目前，如果我手动更改类中的变量，背景确实会更改，但当我尝试使用按钮时，背景不会更改

这是我更改背景的代码 ///////////////////////////////////////////////////

 let gameVC = SelectCharViewController()
    
    
    override func didMove(to view: SKView) {
        
        let backgroundCheck2 = gameVC.getter()
        
        
        physicsWorld.contactDelegate = self
        
      //  var backgroundImage = SKSpriteNode(imageNamed: "background")
        if(backgroundCheck2 == 0){
            let backgroundImage = SKSpriteNode(imageNamed: "background")
            backgroundImage.size = CGSize(width: frame.size.width, height: frame.size.height)
            backgroundImage.position = CGPoint(x: frame.midX, y: frame.midY)
            backgroundImage.zPosition = -1
            addChild(backgroundImage)
            
        }
        else{
            let backgroundImage = SKSpriteNode(imageNamed: "background2")
            backgroundImage.size = CGSize(width: frame.size.width, height: frame.size.height)
            backgroundImage.position = CGPoint(x: frame.midX, y: frame.midY)
            backgroundImage.zPosition = -1
            addChild(backgroundImage)
        }

这是我的按钮代码

import UIKit

class SelectCharViewController: UIViewController {
    
    public var backgroundCheck = 0

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
    }
    
    @IBAction func nightShift(_sender: UIButton){
        print(backgroundCheck)
        self.backgroundCheck+=1;
        print(backgroundCheck)
    }
    
    @IBAction func dayShift(_sender: UIButton){
        print(backgroundCheck)
        self.backgroundCheck-=1;
        print(backgroundCheck)
    }
    
    func getter() -> Int{
        return self.backgroundCheck
    }
    

    /*
    // MARK: - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        // Get the new view controller using segue.destination.
        // Pass the selected object to the new view controller.
    }
    */

}

---

可能有很多事情可以做得不同（例如，使用布尔值而不是整数）

但是我怀疑您没有看到所需的行为，因为您的图像更改代码位于

didMove（to:）

，即

要使其在按下按钮时工作，您可以将该代码移动到自己的函数中，如下所示：

func changeBackground(backgroundCheck2: Int) {
        if backgroundCheck2 == 0 {
            let backgroundImage = SKSpriteNode(imageNamed: "background")
            backgroundImage.size = CGSize(width: frame.size.width, height: frame.size.height)
            backgroundImage.position = CGPoint(x: frame.midX, y: frame.midY)
            backgroundImage.zPosition = -1
            addChild(backgroundImage)
        } else {
            let backgroundImage = SKSpriteNode(imageNamed: "background2")
            backgroundImage.size = CGSize(width: frame.size.width, height: frame.size.height)
            backgroundImage.position = CGPoint(x: frame.midX, y: frame.midY)
            backgroundImage.zPosition = -1
            addChild(backgroundImage)
        }
}

struct Something {
    static var scene = GameScene()
}

Something.scene.changeBackground(backgroundCheck2: 1)

然后，从按钮逻辑调用

changeBackground（backgroundCheck2:）

，无论在哪里

您将需要场景的单个实例。大概是这样的：

func changeBackground(backgroundCheck2: Int) {
        if backgroundCheck2 == 0 {
            let backgroundImage = SKSpriteNode(imageNamed: "background")
            backgroundImage.size = CGSize(width: frame.size.width, height: frame.size.height)
            backgroundImage.position = CGPoint(x: frame.midX, y: frame.midY)
            backgroundImage.zPosition = -1
            addChild(backgroundImage)
        } else {
            let backgroundImage = SKSpriteNode(imageNamed: "background2")
            backgroundImage.size = CGSize(width: frame.size.width, height: frame.size.height)
            backgroundImage.position = CGPoint(x: frame.midX, y: frame.midY)
            backgroundImage.zPosition = -1
            addChild(backgroundImage)
        }
}

struct Something {
    static var scene = GameScene()
}

Something.scene.changeBackground(backgroundCheck2: 1)

因此，在这种情况下，您可以这样调用函数：

func changeBackground(backgroundCheck2: Int) {
        if backgroundCheck2 == 0 {
            let backgroundImage = SKSpriteNode(imageNamed: "background")
            backgroundImage.size = CGSize(width: frame.size.width, height: frame.size.height)
            backgroundImage.position = CGPoint(x: frame.midX, y: frame.midY)
            backgroundImage.zPosition = -1
            addChild(backgroundImage)
        } else {
            let backgroundImage = SKSpriteNode(imageNamed: "background2")
            backgroundImage.size = CGSize(width: frame.size.width, height: frame.size.height)
            backgroundImage.position = CGPoint(x: frame.midX, y: frame.midY)
            backgroundImage.zPosition = -1
            addChild(backgroundImage)
        }
}

struct Something {
    static var scene = GameScene()
}

Something.scene.changeBackground(backgroundCheck2: 1)

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为什么要使用UIKit中的按钮来更改Sprite工具包中的某些内容？你想做的没有意义。