NSKeyedUnarchiver.unarchivedObject 字典返回 nil

Question

我正在尝试将我的代码更新为 iOS12。下面是我的代码：

class CurrentGameState: NSObject, NSSecureCoding {

static var supportsSecureCoding: Bool = true
var currentTest1 = Int()
var currentUnitPositionColumn = [String: Int]()
static var currentGameStatus = CurrentGameState(unit: "init", test: 1, column: -1)
var currentTest1 = Int()
var currentUnitPositionColumn = [String: Int]()

init(unit: String, test: Int, column: Int) {

    currentTest1 = test
    currentUnitPositionColumn[unit] = column
}
func encode(with aCoder: NSCoder) {

    aCoder.encode(currentTest1, forKey: test1)
    aCoder.encode(currentUnitPositionColumn, forKey: currentColumn)
}

required init(coder aDecoder: NSCoder) {

    self.currentTest1 = aDecoder.decodeInteger(forKey: test1)
    self.currentUnitPositionColumn = aDecoder.decodeObject(forKey: currentColumn) as! [String : Int]
}

extension PersistData {
func newSaveMatchInfo(saveType: GlobalConstants.saveType) {

    let gameDataFile = "GameData" + String(describing: saveType)
    if let url = getFileURLInAppDocumentDirectory(fileName: gameDataFile) {

        do{

            let archive = try NSKeyedArchiver.archivedData(withRootObject: CurrentGameState.currentGameStatus, requiringSecureCoding: true)
            try archive.write(to: url)

        }catch{
            print("!!!!!Error saving Game data == \(error)")
        }
    }
}

func newLoadMatchInfo(saveType: GlobalConstants.saveType) {

    let gameDataFile = "GameData" + String(describing: saveType)

    guard let gameData = try? Data(contentsOf: getFileURLInAppDocumentDirectory(fileName: gameDataFile)!),
        let gameInfo = try? NSKeyedUnarchiver.unarchivedObject(ofClasses: [CurrentGameState.self], from: gameData as Data ) else {

            print("!!!!!Error gameInfo = try? NSKeyedUnarchiver.unarchivedObject failed ")
            return
    }

    CurrentGameState.currentGameStatus = gameInfo as! 
}
}

当我运行这段代码时，NSKeyedUnarchiver 为 Int currentTest1 工作，但是当它命中字典 currentUnitPositionColumn 时 returns nil。下面显示的 NSKeyedUnarchiver 的旧代码工作正常，但 unarchiveObject(withFile: 在 iOS12.

中已弃用

func loadMatchInfo(saveType: GlobalConstants.saveType) {
    let gameDataFile = "GameData" + String(describing: saveType)
    if let url = getFileURLInAppDocumentDirectory(fileName: gameDataFile) {
        if let gameData = NSKeyedUnarchiver.unarchiveObject(withFile: url.path) as? CurrentGameState {
            CurrentGameState.currentGameStatus = gameData
        }
    }
}

词典中有些内容不适用于我的新代码。任何帮助将不胜感激。

Answer 1

如果您替换：

，您的代码可以正常工作

let gameInfo = try? NSKeyedUnarchiver.unarchivedObject(ofClasses: [CurrentGameState.self], from: gameData as Data ) else {

与：

let gameInfo = try? NSKeyedUnarchiver.unarchiveTopLevelObjectWithData(gameData) else {

我怀疑使用 unarchivedObject(ofClasses: 失败，因为您无法列出 Dictionary<String, Int>。

NSKeyedUnarchiver.unarchivedObject 字典返回 nil

NSKeyedUnarchiver.unarchivedObject returning nil for dictionary

swift

dictionary

nskeyedunarchiver