将自定义对象保存到NSUserDefaults中

Question

我有新闻ViewController和TeamViewController.所述TeamViewController含有选择加入到阵列时teamObjects的的tableView.我想添加这个数组,NSUserDefaults所以我可以从NewsController包含url请求的地方访问它们,其中需要teamObjects.但是我一直得到:

'尝试为关键团队插入非属性列表对象("")

如果有更好的方法而不是存储它,我愿意接受其他建议 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()
}

我的目标

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

    }

}

Answer 1

实际上,您需要将自定义对象存档,NSData然后将其保存为用户默认值,并从用户默认值中检索它并再次取消归档.你可以像这样归档它

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()

并像这样解开它

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

但如果你这样做,你就会得到

.Team encodeWithCoder:]: unrecognized selector sent to instance

你必须让Team符合这样的NSCoding

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")
    }
}

Answer 2

您可以尝试NSKeyedUnarchiver，如下所示

在这里，我将 UIColor 对象存储在 UserDefault 您可以使用您的对象更改它

 NSData *colorData = [NSKeyedArchiver archivedDataWithRootObject:color];
[[NSUserDefaults standardUserDefaults] setObject:colorData forKey:@"myColor"];

并检索它

NSData *colorData = [[NSUserDefaults standardUserDefaults] objectForKey:@"myColor"];
UIColor *color = [NSKeyedUnarchiver unarchiveObjectWithData:colorData];

注意：这是 Objective C，但我希望你能在 Swift 中隐藏它

希望这能解决您的问题

更新：斯威夫特 5

在 Swift 中存档

do{
    let colorAsData = try NSKeyedArchiver.archivedData(withRootObject: UIColor.red, requiringSecureCoding: true)
    UserDefaults.standard.set(colorAsData, forKey: "myColor")
    UserDefaults.standard.synchronize()
}catch (let error){ 
    #if DEBUG
        print("Failed to convert UIColor to Data : \(error.localizedDescription)")
    #endif
}

在 Swift 中取消归档

do{
    if let colorAsData = UserDefaults.standard.object(forKey: "myColor") as? Data{
        if let color = try NSKeyedUnarchiver.unarchivedObject(ofClasses: [UIColor.self], from: colorAsData){
            // Use Color
        }
    }
}catch (let error){
    #if DEBUG
        print("Failed to convert UIColor to Data : \(error.localizedDescription)")
    #endif
}