尝试在Swift 3中保存自定义对象时尝试插入非属性列表对象 [英] Attempt to insert non-property list object when trying to save a custom object in Swift 3

问题描述

我有一个符合 NSCoding 协议的简单对象。

I have a simple object which conforms to the NSCoding protocol.

import Foundation

class JobCategory: NSObject, NSCoding {
    var id: Int
    var name: String
    var URLString: String

    init(id: Int, name: String, URLString: String) {
        self.id = id
        self.name = name
        self.URLString = URLString
    }

    // MARK: - NSCoding
    required init(coder aDecoder: NSCoder) {
        id = aDecoder.decodeObject(forKey: "id") as? Int ?? aDecoder.decodeInteger(forKey: "id")
        name = aDecoder.decodeObject(forKey: "name") as! String
        URLString = aDecoder.decodeObject(forKey: "URLString") as! String
    }

    func encode(with aCoder: NSCoder) {
        aCoder.encode(id, forKey: "id")
        aCoder.encode(name, forKey: "name")
        aCoder.encode(URLString, forKey: "URLString")
    }
}

我正在尝试在 UserDefaults 中保存它的实例，但它一直失败并出现以下错误。

I'm trying to save an instance of it in UserDefaults but it keeps failing with the following error.

由于未捕获的异常'NSInvalidArgumentException'终止应用程序，原因：'尝试为key jobCategory插入非属性列表对象'

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Attempt to insert non-property list object for key jobCategory'

这是我在 UserDefaults 中保存的代码。

This is the code where I'm saving in UserDefaults.

enum UserDefaultsKeys: String {
    case jobCategory
}

class ViewController: UIViewController {

    @IBAction func didTapSaveButton(_ sender: UIButton) {
        let category = JobCategory(id: 1, name: "Test Category", URLString: "http://www.example-job.com")

        let userDefaults = UserDefaults.standard
        userDefaults.set(category, forKey: UserDefaultsKeys.jobCategory.rawValue)
        userDefaults.synchronize()
    }
}

我用正常字符串将枚举值替换为key，但错误相同仍然会发生。知道造成这种情况的原因是什么吗？

I replaced the enum value to key with a normal string but the same error still occurs. Any idea what's causing this?

推荐答案

你需要创建数据实例使用 <来自您的 JobCategory 实例code> NSKeyedArchiver.archivedData（withRootObject :) 并将 Data 实例存储在 UserDefaults 以后使用 NSKeyedUnarchiver.unarchiveObject取消归档（使用:) ，请尝试这样。

You need to create Data instance from your JobCategory instance using NSKeyedArchiver.archivedData(withRootObject:) and store that Data instance in UserDefaults and later unarchive using NSKeyedUnarchiver.unarchiveObject(with:), So try like this.

用于存储中的数据UserDefaults

For Storing data in UserDefaults

let category = JobCategory(id: 1, name: "Test Category", URLString: "http://www.example-job.com")
let encodedData = NSKeyedArchiver.archivedData(withRootObject: category)
let userDefaults = UserDefaults.standard
userDefaults.set(encodedData, forKey: UserDefaultsKeys.jobCategory.rawValue)

用于从<$ c $检索数据c> UserDefaults

For retrieving data from UserDefaults

let decoded  = UserDefaults.standard.object(forKey: UserDefaultsKeys.jobCategory.rawValue) as! Data
let decodedTeams = NSKeyedUnarchiver.unarchiveObject(with: decoded) as! JobCategory
print(decodedTeams.name)

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