如何保存和加载对象数组 - Swift 4答案

【问题标题】：How to save and load array of objects - Swift 4如何保存和加载对象数组 - Swift 4
【发布时间】：2019-04-04 02:10:33
【问题描述】：

这是我名为 Reminders 的应用中的代码：

文件夹类：

class Folder
{
    var name: String
    var labelName: String
    var imageName : String
    var colour : ColourTheme
    var colourArray : Array<UIColor>
    var maxNumOfPages : Int
    var text : Array<String>
    var touchID : Bool
    var isNewFolder : Bool

init (name: String, labelName: String, imageName: String, colour: ColourTheme, maxNumOfPages: Int, text: Array<Any>, touchID: Bool, isNewFolder: Bool)
{
    self.name = name
    self.labelName = labelName
    self.imageName = imageName
    self.colour = colour
    self.colourArray = []
    self.maxNumOfPages = maxNumOfPages
    self.text = text as! Array<String>
    self.touchID = touchID
    self.isNewFolder = isNewFolder
}

主要风投：

func resetData ()
{
    folderArray.removeAll()

    let folder1 = Folder.init(name: "reminders", labelName: "reminders", imageName: "reminders(bell)(notifications)", colour: .light, maxNumOfPages: 10, text: [""], touchID: false, isNewFolder: false)

    folderArray.append(folder1)
}

func saveData()
{
    let myData = NSKeyedArchiver.archivedData(withRootObject:   folderArray)
    UserDefaults.standard.set(myData, forKey: "folderArrayD")
    print("place saved")
}

func loadData()
{
    let foldersData = UserDefaults.standard.object(forKey: "folderArrayD") as? NSData

    if let foldersData = foldersData
    {
        let folderArray = NSKeyedUnarchiver.unarchiveObject(with: foldersData as Data) as? [Folder]

        if let folderArray = folderArray
    {
        print(folderArray)
    }
}

我正在尝试在程序的不同点保存和加载我的文件夹对象数组。目前它给出了这个错误：

NSForwarding: 警告: 'Reminder.Folder' 类的对象 0x280e3c600 没有实现 methodSignatureForSelector: -- 前面的麻烦无法识别的选择器 -[Reminder.Folder replacementObjectForKeyedArchiver:]

我已经到处寻找尝试解决这个问题，请有人帮忙，谢谢！

【问题讨论】：

标签： class object swift4 saving-data userdefaults

【解决方案1】：

您的文件夹类需要继承自 NSObject 和 NScoding 以及编码器和解码器所需的协议

class Folder: NSObject, NSCoding {
    var name: String
    var labelName: String
    .....
    struct keys {
        static let name = "name"
        static let labelName = "labelName"
    }
    init (name: String, labelName: String .....)
    {
        self.name = name
        self.labelName = labelName
        ......
    }
    required init(coder aDecoder: NSCoder) {
        self.name = aDecoder.decodeObject(forKey: keys.name) as? String ?? ""
        self. labelName = aDecoder.decodeObject(forKey: keys. labelName) as? String ?? ""
    }

    func encode(with aCoder: NSCoder) {
        aCoder.encode(self.emailId, forKey: keys.name)
        aCoder.encode(self.userId, forKey: keys.labelName)
    }
}

【讨论】：

【解决方案2】：

您的文件夹模型类需要从 NSObject 继承并采用协议及其所需的方法在 UserDefaults 中存储数据。

像这样：

class Folder: NSObject {

    var name: String
    var labelName: String
    .....

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

【讨论】：

我该怎么做？
只是你的Folder类继承了NSObject->类Folder到类Folder：NSObject