无法在数组中插入对象，我想将其添加到用户默认值

问题描述

我已初始化数组

    var defaults = NSUserDefaults.standardUserDefaults()
    var initObject: [CPaymentInfo]? = defaults.objectForKey("paymentData") as? [CPaymentInfo]
    if initObject == nil {
        initObject = [CPaymentInfo]()
        defaults.setValue(initObject, forKey: "paymentData")
    }
    defaults.synchronize()

我有Controller，包含两个文本标签和两个按钮：保存和取消（同时调用segue）

And I have the Controller, that contains two text labels and two buttons: Save and Cancel (Both calling the segue)

    if sender as? UIBarButtonItem == saveButton {
        var defaults = NSUserDefaults.standardUserDefaults()
        var payments: [CPaymentInfo]? = defaults.objectForKey("paymentData") as? [CPaymentInfo]
        var newPaymentItem: CPaymentInfo?
        if discriptionField.hasText() {
            newPaymentItem = CPaymentInfo(value: (valueField.text as NSString).doubleValue, discription: discriptionField.text)
        } else {
            newPaymentItem = CPaymentInfo(value: (valueField.text as NSString).doubleValue)
        }

        if let newPay = newPaymentItem {
            payments?.insert(newPay, atIndex: 0)
        }
        defaults.setObject(payments, forKey: "paymentData")
    }

但它不工作和应用程序崩溃。
我发现我可以设置付款作为新的对象在默认的键，而不改变
（通过插入块的注释）。
我也发现，我可以评论行setObject方法，应用程序也将工作。我如何做我想做的？

But it doesn't work and app crashes.I found that I can just set "payments" as new object in defaults for key without changing(By commenting of block with insert).Also I found, that I can comment line with setObject method only and apps will work too. How I can do what I want?

推荐答案

答案在错误信息中：

Attempt to insert non-property list object ( "cash_app.CPaymentInfo" ) for key paymentData'

您不能将任意类放入属性列表（例如 NSUserDefaults ）。有一个可接受的类的特定列表。如果你有其他类，你想存储，你需要将它们转换为可接受的类。

You cannot put arbitrary classes into a property list (such as NSUserDefaults). There is a specific list of classes that are acceptable. If you have other classes you want to store, you need to convert them to an acceptable class.

有关将非属性列表类保存为用户默认值的文档，请参阅。虽然该文章侧重于 NSColor ，但它适用于符合 NSCoding 的任何对象。另请参阅媒体资源列表简介 a>。

For documentation on saving non-property-list classes to user defaults, see Storing NSColor in UserDefaults. While that article focuses on NSColor, it applies to any object that conforms to NSCoding. See also the Note at Introduction to Property Lists.

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