swift - 在 Swift 4 中取消存档 NSMutableArray

Question

我将对象添加到 NSMutableArray 并使用 NSKeyedArchiver 和 UserDefaults 对其进行存档。

对象被添加到数组中，我可以从日志控制台看到它。我还可以看到存档对象包含该对象。

问题是每当我解压对象并将它们添加到可变数组时，它总是返回 1，无论我添加多少个对象。

这是我得到的:

将对象保存到数组

trackNumberOfQuestionPlayed.add(questionsArray[randomQuestion] as AnyObject)

let saveQuestionsPlayed = NSKeyedArchiver.archivedData(withRootObject: trackNumberOfQuestionPlayed)
UserDefaults.standard.set(saveQuestionsPlayed, forKey: "QuestionsPlayed")
UserDefaults.standard.synchronize()

print(UserDefaults.standard.object(forKey: "QuestionsPlayed"))

检索对象

if let data = UserDefaults.standard.object(forKey: "QuestionsPlayed") as? Data {

   if let trackNumberOfQuestionPlayed = (NSKeyedUnarchiver.unarchiveObject(with: data) as? NSMutableArray)
    {
       // In here you can access your array
       print("Number of questions array is NOT empty: \(trackNumberOfQuestionPlayed.count)")
    }
}

Answer 1

好吧，我正在回答我自己的问题。事实证明，通过一些调整，您可以保存一个数组，如我的问题中所述。事实证明，我的问答游戏中的其他一些代码把这一切搞得一团糟。整理了一下，现在下面的代码可以工作了:

将对象保存到数组

 trackNumberOfQuestionPlayed.add(questionsArray[randomQuestion] as AnyObject)
            let saveQuestionsPlayed = NSKeyedArchiver.archivedData(withRootObject: trackNumberOfQuestionPlayed)
            UserDefaults.standard.set(saveQuestionsPlayed, forKey: "QuestionsPlayed")
            UserDefaults.standard.synchronize()
            print("Count: \(trackNumberOfQuestionPlayed.count)")

检索对象

if let data = UserDefaults.standard.object(forKey: "QuestionsPlayed") as? Data {

            if let trackNumberOfQuestionPlayed = (NSKeyedUnarchiver.unarchiveObject(with: data) as? NSMutableArray)
            {
                // In here you can access your array
                self.trackNumberOfQuestionPlayed = trackNumberOfQuestionPlayed
                print("Number of questions array is NOT empty: \(trackNumberOfQuestionPlayed.count)")
            }
        } else {

            trackNumberOfQuestionPlayed = NSMutableArray()
            print("questionsplayed is empty")
        }