Swift

Question

所以我有一组自定义对象。当我尝试将数组保存到 NSUserDefaults 时，我必须将它们存档。这是我正在做的事情来归档我的自定义对象数组：

override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {

    //3

    var allMessages = defaults.objectForKey(UserDefaultsMesssageKey) as! [AddMessageViewController.harassText]
    var aMessage = AddMessageViewController.harassText(phoneNumber: 0, message: "1", frequency: 1, active: 1)
    allMessages.append(aMessage)
    saveMessage(allMessages)


    return (allMessages.count)
}

func archiveMessage(message:[AddMessageViewController.harassText]) -> NSData {
    let archivedObject = NSKeyedArchiver.archivedDataWithRootObject(message as NSArray)
    return archivedObject
}
func saveMessage(messages: [AddMessageViewController.harassText]) {
    let archivedObject = archiveMessage(messages)
    defaults.setObject(archivedObject, forKey: UserDefaultsMesssageKey)
    defaults.synchronize()
}
func retrieveData()-> [AddMessageViewController.harassText]? {
    if let unarchiveObject = NSUserDefaults.standardUserDefaults().objectForKey(UserDefaultsMesssageKey) as? NSData {
        return NSKeyedUnarchiver.unarchiveObjectWithData(unarchiveObject) as? [AddMessageViewController.harassText]
    }
    return nil
}

流程是：

调用 saveMessage 时，传入自定义数组以进行存档。这是数组在 GDB 中的样子。可以看到是一个数组，里面包含了1个class对象。

([Harass_Your_Kate.AddMessageViewController.harassText]) $R0 = 1 value { [0] = 0x00007fa5ab409600 { ObjectiveC.NSObject = { isa = Harass_Your_Kate.AddMessageViewController.harassText } phoneNumber = 0 message = "1" frequency = 1 active = 1 } }
数组被传递到 archiveMessage。该代码在 NSKeyedArchiver 方法上立即失败。报错信息如下：
```
[_TtCC16Harass_Your_Kate24AddMessageViewController10harassText encodeWithCoder:]: unrecognized selector sent to instance 0x7fa5ab409600
```
2016-07-15 16:31:26.019 骚扰你的凯特 [5858:7847495] * -[NSKeyedArchiver dealloc]: 警告：NSKeyedArchiver 在没有调用 -finishEncoding 的情况下被释放。 2016-07-15 16:31:26.023 Harass Your Kate[5858:7847495] * 由于未捕获的异常 'NSInvalidArgumentException' 而终止应用程序，原因：'-[_TtCC16Harass_Your_Kate24AddMessageViewController10harassText encodeWithCoder： ]：无法识别的选择器发送到实例 0x7fa5ab409600

非常感谢所有的帮助，提前致谢！

编辑：这是我的对象的定义：

class Text : NSObject {
    var phoneNumber = 0             //Text address to send to
    var message: String = ""        //Message to be sent
    var frequency = 24              //Number of hours between messages (usually a multiple of 24 - 24 = daily)
    var active = 0                  // 0 if cancelled, 1 if active

    init(phoneNumber: Int, message: String, frequency: Int, active: Int ){
        self.phoneNumber = phoneNumber
        self.message = message
        self.frequency = frequency
        self.active = active
    }
}

Answer 1

NSKeyedArchiver 通过利用方法序列化对象你必须通过遵守 NSCoding 协议来提供。它无法自动推断如何保存您的自定义 classes；你必须自己实现如下：

class Text : NSObject, NSCoding {
    var phoneNumber = 0             //Text address to send to
    var message: String = ""        //Message to be sent
    var frequency = 24              //Number of hours between messages (usually a multiple of 24 - 24 = daily)
    var active = 0                  // 0 if cancelled, 1 if active

    init(phoneNumber: Int, message: String, frequency: Int, active: Int ){
        self.phoneNumber = phoneNumber
        self.message = message
        self.frequency = frequency
        self.active = active
    }

    required init?(coder aDecoder: NSCoder) {
        phoneNumber = aDecoder.decodeInteger(forKey: "phoneNumber")
        message = aDecoder.decodeObject(forKey: "message") as! String
        frequency = aDecoder.decodeInteger(forKey: "frequency")
        active = aDecoder.decodeInteger(forKey: "active")
    }

    func encode(with aCoder: NSCoder) {
        aCoder.encode(phoneNumber, forKey: "phoneNumber")
        aCoder.encode(message, forKey: "message")
        aCoder.encode(frequency, forKey: "frequency")
        aCoder.encode(active, forKey: "active")
    }
}

如您所见，初始化器从编码器读取并创建实例，而encode方法将相关信息保存到编码器。在像这样的简单 class 中，它们的实现可能看起来很明显，但在更复杂的自定义类型中，需要做出重要的编码决策。

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