Question

我将数据存储在Firebase实时数据库中，如下所示：

{
   trivia: {
     "0": "long text",
     "1": "long text",
     "2": "long text",
   }
}

但是当我从数据库中导出json时，它呈现为如下数组：

{
   trivia: ["long text", "long text", "long text"]
}

现在该怎么办？以下是我的快速代码，但出现此错误-“无法将类型'__NSArrayM'（0x106630b68）的值强制转换为'NSString'（0x104b802a8）。”

class TriviaViewController: UICollectionViewController {

    var triviaList = [String]()   
    var ref: DatabaseReference!

    override func viewDidLoad() {
        super.viewDidLoad()
        setupNavBar()
        setupCollectionView()
        fetchTriviaFromFirebase()
    }

    func fetchTriviaFromFirebase() {
        ref = Database.database().reference()
        ref?.child("trivia").observeSingleEvent(of: .value, with: { (data) in
            self.triviaList.append(data.value as! String)
            self.collectionView?.reloadData()
        })
    }


// Other functions - colectionview methds and other methods are below

}

Answer 1

guard let value = data.value as? NSDictionary else { return }
guard let obj = value.allValues as? [String] else { return }
self.triviaList = obj
self.collectionView?.reloadData()

如何从Firebase读取数据？

1 个答案: