ios - Fatal error : init(coder:) has not been implemented. 运行时哪里出错

Question

我不明白如何修复该错误。如果有人明白请帮忙!

class GameScene: SKScene {
    let player = SKSpriteNode(imageNamed: "playerShip")
    let bulletSound = SKAction.playSoundFileNamed("bulletSound.wav", waitForCompletion: false)

    var gameArea: CGRect

    override init(size: CGSize)
    {
        let maxAspectRatio: CGFloat = 16.0/9.0
        let playableWidth = size.height/maxAspectRatio
        let margin = (size.width - playableWidth)/2
        gameArea = CGRect(x: margin, y: 0, width: playableWidth, height: size.height)
        super.init(size: size)
    }

    required init?(coder aDecoder: NSCoder)
    {
        fatalError("init(coder:) has not been implemented")
    }

我正在尝试为屏幕上的对象设置边界。当我编写 super.init(size: size) 时，Xcode 自动创建了所需的 init?(coder aDecoder: NSCoder)，但是当它运行时，我收到以下错误:

Thread 1: Fatal error: init(coder:) has not been implemented

Answer 1

因为您已经使用覆盖 init(size: CGSize) 方法覆盖了 SKScene 的指定初始化程序，因此必须实现此必需的 init?(coder aDecoder: NSCoder) 允许自定义 SKScene 类(您的 GameScene 类)、对象序列化的方法。

这篇旧文章可能会帮助您解释这一点:

What exactly is init coder aDecoder?

如果您尝试初始化 gameArea 变量，为什么不尝试在 sceneDidLoad() 的重写中设置 gameArea 呢？ (下面的代码真的很糟糕):

class GameScene: SKScene {
    let player = SKSpriteNode(imageNamed: "playerShip")
    let bulletSound = SKAction.playSoundFileNamed("bulletSound.wav", waitForCompletion: false)

    var gameArea: CGRect?

    override func sceneDidLoad() {
        let maxAspectRatio: CGFloat = 16.0/9.0
        let playableWidth = size.height/maxAspectRatio
        let margin = (size.width - playableWidth)/2

        gameArea = CGRect(x: margin, y: 0, width: playableWidth, height: size.height)
    }

    <<more of your code>>
}

并消除覆盖 init(size: CGSize)