swift - 尝试将数据附加到子值时应用程序崩溃

Question

我正在按照 firebase 中显示的说明进行操作，但即使在确保文本条目的类型为 String 之后，我仍然遇到崩溃。

这是错误:

Terminating app due to uncaught exception 'InvalidPathValidation', reason: '(child:) Must be a non-empty string and not contain '.' '#' '$' '[' or ']''

代码如下:

import UIKit
import Firebase
import FirebaseDatabase
import FirebaseAuth

class BioEditViewController: UIViewController {

    @IBOutlet weak var bioTextView: UITextView!
    let databaseRef = FIRDatabase.database().reference()


    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func viewWillAppear(animated: Bool) {
        let userID = FIRAuth.auth()?.currentUser?.uid
        databaseRef.child("users").child(userID!).observeSingleEventOfType(.Value, withBlock: { (snapshot) in
            // Get user level
            let userBio = snapshot.value!["userBio"] as! String
            self.bioTextView.text = userBio

        })
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


    @IBAction func doneSave(sender: UIButton) {
        let textView = bioTextView.text
        self.dismissViewControllerAnimated(false, completion: nil)
        databaseRef.child("users/(user.uid)/userBio").setValue(textView)


    }
}

我只是想更新一个特定的子对象:userBio，而不影响整个对象。

Answer 1

警告

避免将数据库引用实例化到超出范围的变量。原因:- 在你的范围之外，当你将一个类实例化为一个变量时，你不知道你的 FIRApp 是否已经配置，或者一般情况下该类是否已经初始化。只需提供对变量的引用 (!) 并稍后在范围内实例化。

改变:-

let databaseRef = FIRDatabase.database().reference()

到

let databaseRef = FIRDatabaseReference!

在使用之前将其初始化为:-

databaseRef = FIRDatabase.database().reference()

尝试:-

 @IBAction func doneSave(sender: UIButton) {
    let textView = bioTextView.text
    self.dismissViewControllerAnimated(false, completion: nil)
    databaseRef = FIRDatabase.database().reference()
     databaseRef.child("users/\(FIRAuth.auth!.currentUser!.uid)/userBio").setValue(textView)
      }