在Swift 4中解压缩NSMutableArray

Question

我正在将对象添加到NSMutableArray中，并使用NSKeyedArchiver和UserDefaults对其进行归档。

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

问题是，每当我解压缩对象并将它们添加到可变数组中时，它总是返回1，不管我添加了多少个对象。

我得到的是：

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，我在回答我自己的问题。结果是，只要稍微调整一下，就可以像我的问题中所描述的那样保存一个数组。结果是我的智力测验游戏中的其他代码把这一切搞得一团糟。把它整理出来，下面的代码开始工作了：

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")
        }