Question

我正在尝试将数据保存在firebase上，然后从该数据库中获取数据，但是看到此错误。我尝试了许多链接，但未找到任何帮助？谢谢前进...

import UIKit
import GoogleMaps
import FirebaseCore
import Firebase
import FirebaseDatabase

class ViewController: UIViewController {

 var databaseRefer: DatabaseReference!
 var databaseHandle: DatabaseHandle!

 override func viewDidLoad() {
    super.viewDidLoad()

    databaseRefer = Database.database().reference()
    databaseRefer.child("name").childByAutoId().setValue("England")
   databaseRefer.child("name").childByAutoId().setValue("Pakistan")

    DatabaseHandle = 
     databaseRefer.child("name").observe(.childAdded, with: { 
         (data) in
        let name = (data.value as? String)
        debugPrint(name)
    })
}



Geting this Error at this line...

DatabaseHandle = databaseRefer.child("name").observe(.childAdded, 
    with: { (data) in
        let name = (data.value as? String)
        debugPrint(name)
    })

无法分配给'DatabaseHandle.Type'类型的不可变表达式（又名“ UInt.Type”）

Answer 1

尝试通过以下方式获取数据：

let ref = Database.database().reference(withPath: "YOUR_CHILD_NAME")
ref.observeSingleEvent(of: .value) { (snapshot) in
    if !snapshot.exists() { return }
    print("DATA RECEIVED FROM FIREBASE!!!")
    print(snapshot.value)
}

尝试使用Firebase保存和获取数据，但收到此错误

1 个答案: