arrays - 从 Firebase 字典创建数组

Question

我尝试从 Firebase 检索字典并从字典中提取每个值并将其附加到空数组，但我的代码不起作用。我什至没有添加将其附加到数组的代码，当我运行它时，控制台中会打印“错误”。

This is what it looks like inside Firebase

这就是我的代码的样子:

    func convertAllMosaicsToArray() {
    // retrieve and convert here

    Database.database().reference().child("mosiacTitles").observe(.value, with: { (snapshot) in

        if let dictionary = snapshot.value as? [Int : AnyObject] {
            print(dictionary)
        } else {
            print("error")
        }
    })

}

Answer 1

    static func load(_ completion: @escaping () -> ()) {
    if let user = Auth.auth().currentUser {
        let ref = Database.database().reference().child("users").child(user.uid).child("something")
        ref.observe(.value, with: { (snapshot) in

            if let data = snapshot.value as? [String : AnyObject] {

                var arrayNeeded: [Int] = []

                if let array = data["key"] as? [Int] {
                        arrayNeeded = array
                }

            }
            completion()

        })
    }
}