Ios 在UserDefault上使用NSKeyedArchiver时重置属性_Ios_Swift_Sprite Kit_Nskeyedarchiver_Userdefaults

Ios 在UserDefault上使用NSKeyedArchiver时重置属性

ios swift sprite-kit

Ios 在UserDefault上使用NSKeyedArchiver时重置属性,ios,swift,sprite-kit,nskeyedarchiver,userdefaults,Ios,Swift,Sprite Kit,Nskeyedarchiver,Userdefaults,我有一个SKSpriteNode对象数组，我想将其持久化为UserDefaults。在下面的代码（）中，我使用NSKeyedUnarchiver将数组编码为数据，然后将其设置为默认值。但是当我取消归档数据时，对象的engineSize属性被重置为默认值0 Car.swift import SpriteKit class Car: SKSpriteNode { var engineSize: Int = 0 init() { super.init(texture

我有一个

SKSpriteNode

对象数组，我想将其持久化为

UserDefaults

。在下面的代码（）中，我使用

NSKeyedUnarchiver

将数组编码为数据，然后将其设置为默认值。但是当我取消归档数据时，对象的

engineSize

属性被重置为默认值0

Car.swift

import SpriteKit

class Car: SKSpriteNode {
    var engineSize: Int = 0

    init() {
        super.init(texture: nil, color: .blue, size: CGSize(width: 100, height: 100))
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }
}

import SpriteKit

class GameScene: SKScene {
    let defaults = UserDefaults.standard
    var carArray = [Car]()

    override func didMove(to view: SKView) {
        for _ in 1...3 {
            let car = Car()
            car.engineSize = 2000
            carArray.append(car)
        }

        // Save to defaults
        defaults.set(NSKeyedArchiver.archivedData(withRootObject: carArray), forKey: "carArrayKey")

        // Restore from defaults
        let arrayData = defaults.data(forKey: "carArrayKey")
        carArray = NSKeyedUnarchiver.unarchiveObject(with: arrayData!) as! [Car]
    }

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        for c in carArray {
            print("Car's engine size is \(c.engineSize)")
        }
    }
}

import SpriteKit

class Car: SKSpriteNode {
    var engineSize: Int = 0
    
    init() {
        super.init(texture: nil, color: .blue, size: CGSize(width: 100, height: 100))
    }
    
    required init(coder aDecoder: NSCoder) {
        engineSize = aDecoder.decodeInteger(forKey: "engineSize")
        super.init(texture: nil, color: .blue, size: CGSize(width: 100, height: 100))
    }
    
    override func encode(with aCoder: NSCoder) {
        aCoder.encode(engineSize, forKey: "engineSize")
    }
}

import SpriteKit

class GameScene: SKScene {
    let defaults = UserDefaults.standard
    var carArray = [Car]()
    
    override func didMove(to view: SKView) {
        for _ in 1...3 {
            let car = Car()
            car.engineSize = 2000
            carArray.append(car)
        }
        
        defaults.set(NSKeyedArchiver.archivedData(withRootObject: carArray), forKey: "carArrayKey")
        
        let arrayData = defaults.data(forKey: "carArrayKey")
        carArray = NSKeyedUnarchiver.unarchiveObject(with: arrayData!) as! [Car]
    }
    
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        for c in carArray {
            print("Car's engine size is \(c.engineSize)")
        }
    }
}

游戏场景。swift

import SpriteKit

class Car: SKSpriteNode {
    var engineSize: Int = 0

    init() {
        super.init(texture: nil, color: .blue, size: CGSize(width: 100, height: 100))
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }
}

import SpriteKit

class GameScene: SKScene {
    let defaults = UserDefaults.standard
    var carArray = [Car]()

    override func didMove(to view: SKView) {
        for _ in 1...3 {
            let car = Car()
            car.engineSize = 2000
            carArray.append(car)
        }

        // Save to defaults
        defaults.set(NSKeyedArchiver.archivedData(withRootObject: carArray), forKey: "carArrayKey")

        // Restore from defaults
        let arrayData = defaults.data(forKey: "carArrayKey")
        carArray = NSKeyedUnarchiver.unarchiveObject(with: arrayData!) as! [Car]
    }

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        for c in carArray {
            print("Car's engine size is \(c.engineSize)")
        }
    }
}

import SpriteKit

class Car: SKSpriteNode {
    var engineSize: Int = 0
    
    init() {
        super.init(texture: nil, color: .blue, size: CGSize(width: 100, height: 100))
    }
    
    required init(coder aDecoder: NSCoder) {
        engineSize = aDecoder.decodeInteger(forKey: "engineSize")
        super.init(texture: nil, color: .blue, size: CGSize(width: 100, height: 100))
    }
    
    override func encode(with aCoder: NSCoder) {
        aCoder.encode(engineSize, forKey: "engineSize")
    }
}

import SpriteKit

class GameScene: SKScene {
    let defaults = UserDefaults.standard
    var carArray = [Car]()
    
    override func didMove(to view: SKView) {
        for _ in 1...3 {
            let car = Car()
            car.engineSize = 2000
            carArray.append(car)
        }
        
        defaults.set(NSKeyedArchiver.archivedData(withRootObject: carArray), forKey: "carArrayKey")
        
        let arrayData = defaults.data(forKey: "carArrayKey")
        carArray = NSKeyedUnarchiver.unarchiveObject(with: arrayData!) as! [Car]
    }
    
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        for c in carArray {
            print("Car's engine size is \(c.engineSize)")
        }
    }
}

然而，这似乎不起作用<代码>游戏场景仍在将

引擎大小

打印为0。我是否实现了编码器/解码器错误？当属性从默认值还原时，如何防止将

引擎化属性重置为0
更新
这是我更新的Car
课程，我正试图让它与rmaddy的建议一起工作：
import SpriteKit

class Car: SKSpriteNode {
    var engineSize: Int = 0

    init() {
        super.init(texture: nil, color: .blue, size: CGSize(width: 100, height: 100))
    }

    required init?(coder decoder: NSCoder) {
        super.init(coder: decoder)
        if let engineSize = decoder.decodeObject(forKey: "engineSize") as? Int {
            self.engineSize = engineSize
        }
    }

    func encodeWithCoder(coder : NSCoder) {
        super.encode(with: coder)
        coder.encode(self.engineSize, forKey: "engineSize")
    }
}

代码编译并运行，但保存为默认值时，engineSize
属性仍被重置为0。
我成功地使其正常工作。以下是更新后的游戏场景
和汽车
代码文件，其中NSCoding
已正确执行
Car.swift
import SpriteKit

class Car: SKSpriteNode {
    var engineSize: Int = 0

    init() {
        super.init(texture: nil, color: .blue, size: CGSize(width: 100, height: 100))
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }
}

import SpriteKit

class GameScene: SKScene {
    let defaults = UserDefaults.standard
    var carArray = [Car]()

    override func didMove(to view: SKView) {
        for _ in 1...3 {
            let car = Car()
            car.engineSize = 2000
            carArray.append(car)
        }

        // Save to defaults
        defaults.set(NSKeyedArchiver.archivedData(withRootObject: carArray), forKey: "carArrayKey")

        // Restore from defaults
        let arrayData = defaults.data(forKey: "carArrayKey")
        carArray = NSKeyedUnarchiver.unarchiveObject(with: arrayData!) as! [Car]
    }

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        for c in carArray {
            print("Car's engine size is \(c.engineSize)")
        }
    }
}

import SpriteKit

class Car: SKSpriteNode {
    var engineSize: Int = 0
    
    init() {
        super.init(texture: nil, color: .blue, size: CGSize(width: 100, height: 100))
    }
    
    required init(coder aDecoder: NSCoder) {
        engineSize = aDecoder.decodeInteger(forKey: "engineSize")
        super.init(texture: nil, color: .blue, size: CGSize(width: 100, height: 100))
    }
    
    override func encode(with aCoder: NSCoder) {
        aCoder.encode(engineSize, forKey: "engineSize")
    }
}

import SpriteKit

class GameScene: SKScene {
    let defaults = UserDefaults.standard
    var carArray = [Car]()
    
    override func didMove(to view: SKView) {
        for _ in 1...3 {
            let car = Car()
            car.engineSize = 2000
            carArray.append(car)
        }
        
        defaults.set(NSKeyedArchiver.archivedData(withRootObject: carArray), forKey: "carArrayKey")
        
        let arrayData = defaults.data(forKey: "carArrayKey")
        carArray = NSKeyedUnarchiver.unarchiveObject(with: arrayData!) as! [Car]
    }
    
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        for c in carArray {
            print("Car's engine size is \(c.engineSize)")
        }
    }
}

游戏场景。swift
import SpriteKit

class Car: SKSpriteNode {
    var engineSize: Int = 0

    init() {
        super.init(texture: nil, color: .blue, size: CGSize(width: 100, height: 100))
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }
}

import SpriteKit

class GameScene: SKScene {
    let defaults = UserDefaults.standard
    var carArray = [Car]()

    override func didMove(to view: SKView) {
        for _ in 1...3 {
            let car = Car()
            car.engineSize = 2000
            carArray.append(car)
        }

        // Save to defaults
        defaults.set(NSKeyedArchiver.archivedData(withRootObject: carArray), forKey: "carArrayKey")

        // Restore from defaults
        let arrayData = defaults.data(forKey: "carArrayKey")
        carArray = NSKeyedUnarchiver.unarchiveObject(with: arrayData!) as! [Car]
    }

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        for c in carArray {
            print("Car's engine size is \(c.engineSize)")
        }
    }
}

import SpriteKit

class Car: SKSpriteNode {
    var engineSize: Int = 0
    
    init() {
        super.init(texture: nil, color: .blue, size: CGSize(width: 100, height: 100))
    }
    
    required init(coder aDecoder: NSCoder) {
        engineSize = aDecoder.decodeInteger(forKey: "engineSize")
        super.init(texture: nil, color: .blue, size: CGSize(width: 100, height: 100))
    }
    
    override func encode(with aCoder: NSCoder) {
        aCoder.encode(engineSize, forKey: "engineSize")
    }
}

import SpriteKit

class GameScene: SKScene {
    let defaults = UserDefaults.standard
    var carArray = [Car]()
    
    override func didMove(to view: SKView) {
        for _ in 1...3 {
            let car = Car()
            car.engineSize = 2000
            carArray.append(car)
        }
        
        defaults.set(NSKeyedArchiver.archivedData(withRootObject: carArray), forKey: "carArrayKey")
        
        let arrayData = defaults.data(forKey: "carArrayKey")
        carArray = NSKeyedUnarchiver.unarchiveObject(with: arrayData!) as! [Car]
    }
    
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        for c in carArray {
            print("Car's engine size is \(c.engineSize)")
        }
    }
}

你需要在init（coder:）
和encodeWithCoder（coder:）
方法中调用super
。你还应该删除并重新安装你的应用程序，以确保用户默认值中没有以前尝试过的错误数据。我添加了super.encode（with:coder）
好，但在init（coder:）
编译器不喜欢调用super.init（解码器）
。它抱怨说：Car的便利初始值设定项必须委托（使用'self.init'），而不是链接到超类初始值设定项（使用'super.init'）
init（coder:）
不应标记为便利初始值设定项。@rmaddy删除convency
会产生错误。我更新了帖子以显示我正在尝试的代码。