尝试将数据附加到子值时,应用程序崩溃

Question

我按照firebase中的说明进行操作,但即使确保文本条目为String类型,我仍然会崩溃.

这是错误:

由于未捕获的异常"InvalidPathValidation"而终止应用程序,原因:'(child :)必须是非空字符串且不包含'.' '#''$''['或']''

这是代码:

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节点:userBio而不影响整个对象.

Answer 1

警告

避免将数据库引用实例化为超出范围的变量.原因: - 在您的范围之外,当您将一个类实例化为变量时,您不知道您FIRApp是否已经配置了,或者通常是否该类已经初始化了.只需为变量提供引用(!)并稍后在作用域中实例化.

更改:-

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

至

let databaseRef = FIRDatabaseReference!

在使用之前,只需将其初始化为: -

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)
      }