Xcode致命错误：init（编码器:)尚未通过子类化SKSpritenode实现

Question

我不知道我是如何得到这个错误的。我创建了一个名为item的类，它继承了NSObject和NSCoding。该类解码并编码SKSpritenode。我决定我想要更复杂的项目，所以我创建了一个来自SKSpritenode的子类，它具有一些额外的功能。

import UIKit
import SpriteKit

class SpecialNodes: SKSpriteNode {
    private var textAtlas: SKTextureAtlas
    private var imageUniformName: String
    init(Begintexture: SKTexture!, textAtlas: SKTextureAtlas, uniformName: String) {
        self.textAtlas = textAtlas
        let texture = Begintexture
        self.imageUniformName = uniformName
        super.init(texture: texture, color: UIColor.clear, size: (texture?.size())!)
        print(Begintexture)

        animateTextures(atlas: textAtlas)

    }

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

    func animateTextures(atlas: SKTextureAtlas) {
        let pacAtlas = atlas
        var frames = [SKTexture]()

        let numImages = pacAtlas.textureNames.count

        for i in 1...numImages/2 {
            let textName = "\(imageUniformName)\(i)"
            frames.append(pacAtlas.textureNamed(textName))
        }

        let animation = SKAction.animate(with: frames, timePerFrame: 0.1)

        self.run(SKAction.repeatForever(SKAction.sequence([animation,animation.reversed()])))

    }

}

这给了我一个错误致命错误：init（编码器:)尚未实现。我猜测什么时候SKSpritenode的这个子类在项目类中被解码？我不确定发生了什么。