将自定义对象保存到NSUserDefaults中 [英] Save custom objects into NSUserDefaults

问题描述

我有新闻 ViewController 和 TeamViewController 。 TeamViewController 包含teamObjects的tableView，选中后将其添加到数组中。我想将此数组添加到 NSUserDefaults 中，以便我可以从 NewsController 访问它们，其中包含url请求，其中包含teamObjects需要。但是我一直得到：

I'm having a news ViewController and a TeamViewController. The TeamViewController contain a tableView of teamObjects which when selected is added into array. I want to add this array into NSUserDefaults so i can access them from the NewsController which contain a url request where the teamObjects is needed. However i keep getting:

'尝试为密钥插入非属性列表对象（

）团队'

'Attempt to insert non-property list object ( "" ) for key teams'

如果有更好的方法而不是将其存储在 NSUserDefaults中，我会对其他建议开放

I'm open for other suggestions if there is better ways than storing it in NSUserDefaults

didSelectRowAtIndexPath 方法

override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
    tableView.deselectRowAtIndexPath(indexPath, animated: true)


    let team = self.teamArray[indexPath.row] as Team
    var removed = false

    for (index, value) in enumerate(self.teamSelected) {
        if (value == team) {
            self.teamSelected.removeAtIndex(index)
            removed = true
        }
    }

    if (!removed) {
        self.teamSelected.append(team)
    }

    var userDefaults = NSUserDefaults.standardUserDefaults()
    userDefaults.setValue(self.teamSelected, forKey: "teams")
    userDefaults.synchronize()

    tableView.reloadData()
}

我的对象

class Team: NSObject{
    var id: Int!
    var name: NSString!
    var shortname: NSString!


    init(id: Int, name:NSString, shortname: NSString) {
        self.id = id
        self.name = name
        self.shortname = shortname

    }

}

推荐答案

实际上，您需要将自定义对象存档到 NSData 中，然后将其保存为用户默认值并从用户默认值中检索并取消归档再一次。
你可以像这样存档

Actually, you will need to archive the custom object into NSData then save it to user defaults and retrieve it from user defaults and unarchive it again. You can archive it like this

let teams = [Team(id: 1, name: "team1", shortname: "t1"), Team(id: 2, name: "team2", shortname: "t2")]

var userDefaults = UserDefaults.standard
let encodedData: Data = NSKeyedArchiver.archivedData(withRootObject: teams)
userDefaults.set(encodedData, forKey: "teams")
userDefaults.synchronize()

并将其解压缩如此

let decoded  = userDefaults.object(forKey: "teams") as! Data
let decodedTeams = NSKeyedUnarchiver.unarchiveObject(with: decoded) as! [Team]

但如果你刚刚那样做，你将获得

But if you just did that you will get

.Team encodeWithCoder:]: unrecognized selector sent to instance

你必须让Team符合NSCoding就像这样

You will have to make Team conform to NSCoding just like this

class Team: NSObject, NSCoding {
    var id: Int
    var name: String
    var shortname: String


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

    }

    required convenience init(coder aDecoder: NSCoder) {
        let id = aDecoder.decodeInteger(forKey: "id")
        let name = aDecoder.decodeObject(forKey: "name") as! String
        let shortname = aDecoder.decodeObject(forKey: "shortname") as! String
        self.init(id: id, name: name, shortname: shortname)
    }

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

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