Swift 4中的不合理的NSMutablearray

Question

我正在将对象添加到nsmutablearray，并使用nskeyedarachiver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。我还可以看到存档对象包含对象。

问题是 ，每当我不构造对象并将它们添加到可变数组中时，无论我添加多少对象，它总是返回1。P>

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，我正在回答自己的问题。事实证明，您可以按照我的问题所述保存一个数组。事实证明，我的测验游戏中的其他一些代码弄乱了这一切。对其进行整理，现在下面的代码有效：

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")
        }