如何归档和取消归档Swift中的自定义对象？或者如何保存自定义对象到NSUserDefaults在Swift？ [英] How to archive and unarchive custom objects in Swift? Or how to save custom object to NSUserDefaults in Swift?

问题描述

我有一个类

class Player {

    var name = ""

    func encodeWithCoder(encoder: NSCoder) {
        encoder.encodeObject(name)
    }

    func initWithCoder(decoder: NSCoder) -> Player {
        self.name = decoder.decodeObjectForKey("name") as String
        return self
    }

    init(coder aDecoder: NSCoder!) {
        self.name = aDecoder.decodeObjectForKey("name") as String
    }

    init(name: String) {
        self.name = name
    }
}

，我想序列化并保存为用户默认值。

and i want to serialise it and save to user defaults.

首先我不知道如何正确编写编码器和解码器。所以对于init我写了两个方法。

First of all I'm not sure how to correctly write encoder and decoder. So for init i wrote two methods.

当我尝试执行这个代码：

When i try to execute this code:

func saveUserData() {
    let player1 = Player(name: "player1")
    let myEncodedObject = NSKeyedArchiver.archivedDataWithRootObject(player1)
    NSUserDefaults.standardUserDefaults().setObject(myEncodedObject, forKey: "player")
}

app crashes and i get this message:

*** NSForwarding: warning: object 0xebf0000 of class '_TtC6GameOn6Player' does not implement methodSignatureForSelector: -- trouble ahead

我做错了什么？

推荐答案

NSKeyedArchiver只能使用Objective-C类，而不是纯Swift类。您可以通过使用 @objc 属性标记类或通过继承Objective-C类，例如 NSObject 。

NSKeyedArchiver will only work with Objective-C classes, not pure Swift classes. You can bridge your class to Obj-C by marking it with the @objc attribute or by inheriting from an Objective-C class, such as NSObject.

请参阅使用Swift与Cocoa和Objective-C 了解更多信息。

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