UserDefaults 自定义对象的自定义对象

Posted 2023-05-07

【中文标题】UserDefaults 自定义对象的自定义对象

【英文标题】：UserDefaults Custom Object of Custom Objects

【发布时间】：2018-04-25 15:14:24

【问题描述】：

我想用 UserDefaults 保存我的部分设置。

我已经在这里找到了这个解决方案： Save custom objects into NSUserDefaults

但如果自定义对象中有自定义对象，我不知道如何保存。

我的课程如下所示：

class ConfigLabelMainList: NSObject, NSCoding 


    var labelMiddleFirst: StatsIntervalModel
    var labelMiddleSecond: StatsIntervalModel
    var labelMiddleThird: StatsIntervalModel
    var labelRightFirst: StatsIntervalModel
    var labelRightSecond: StatsIntervalModel

    init(labelMiddleFirst: StatsIntervalModel, labelMiddleSecond: StatsIntervalModel, labelMiddleThird: StatsIntervalModel, labelRightFirst: StatsIntervalModel, labelRightSecond: StatsIntervalModel) 
        self.labelMiddleFirst = labelMiddleFirst
        self.labelMiddleSecond = labelMiddleSecond
        self.labelMiddleThird = labelMiddleThird
        self.labelRightFirst = labelRightFirst
        self.labelRightSecond = labelRightSecond
    

    func encode(with aCoder: NSCoder) 

    

    required convenience init?(coder aDecoder: NSCoder) 

    



class StatsIntervalModel: NSObject, NSCoding 
    var stat: String
    var interval: String

    init(stat: String, interval: String) 
        self.stat = stat
        self.interval = interval
    

    required convenience init?(coder aDecoder: NSCoder) 
        let stat = aDecoder.decodeObject(forKey: "stat") as! String
        let interval = aDecoder.decodeObject(forKey: "interval") as! String
        self.init(stat: stat, interval: interval)
    

    func encode(with aCoder: NSCoder) 
        aCoder.encode(stat, forKey: "stat")
        aCoder.encode(interval, forKey: "interval")
    

解决方案是什么样的？

【问题讨论】：

没有区别。就像在 StatsIntervalModel 中所做的一样，只需对 ConfigLabelMainList 的属性进行编码和解码。

【参考方案1】：

在你的类中添加给定的代码ConfigLabelMainList

required convenience init?(coder aDecoder: NSCoder) 

    let midFirst = aDecoder.decodeObject(forKey: "midFirst") as! StatsIntervalModel
    let midSecond = aDecoder.decodeObject(forKey: "midSecond") as! StatsIntervalModel
    let midThird = aDecoder.decodeObject(forKey: "midThird") as! StatsIntervalModel
    let rightFirst = aDecoder.decodeObject(forKey: "rightFirst") as! StatsIntervalModel
    let rightSecond = aDecoder.decodeObject(forKey: "rightSecond") as! StatsIntervalModel

    self.init(labelMiddleFirst: midFirst, labelMiddleSecond: midSecond, labelMiddleThird: midThird, labelRightFirst: rightFirst, labelRightSecond: rightSecond)


func encode(with aCoder: NSCoder) 
    aCoder.encode(labelMiddleFirst, forKey: "midFirst")
    aCoder.encode(labelMiddleSecond, forKey: "midSecond")
    aCoder.encode(labelMiddleThird, forKey: "midThird")
    aCoder.encode(labelRightFirst, forKey: "rightFirst")
    aCoder.encode(labelRightSecond, forKey: "rightSecond")

现在只需归档数据并将其保存为默认值。

【讨论】：

谢谢，这有帮助！