Question

我正在将Firebase数据库与Xcode项目连接。我已成功使用print（snapshot.value）将数据库的快照打印到控制台中。但是，我正在努力将数据快照打印到TableView中。谢谢。

这是我的代码：

import UIKit
import FirebaseDatabase

class ViewController: UITableViewController {



@IBOutlet var cosmos: UITextView!
@IBOutlet var gallonsTXT: UITableView!
@IBOutlet var tables: UITableView!


@IBOutlet var Finale: UILabel!
var ref:DatabaseReference?
var databaseHandle:DatabaseHandle?
var postData = [String]()


override func viewDidLoad() {
    super.viewDidLoad()

    gallonsTXT.delegate = self
    gallonsTXT.dataSource = self

    ref = Database.database().reference()

    databaseHandle = ref?.child("Total gallons:").observe(.childAdded, with: { (snapshot) in

        print(snapshot.value) 

        let post = snapshot.value as? String

        if let actualPost = post {

            self.postData.append(actualPost)

        self.tableView.reloadData()


        }

    })
    // Do any additional setup after loading the view, typic    ally from a nib.
}

override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {

    return postData.count

}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

    let cell =  tableView.dequeueReusableCell(withIdentifier: "PostCell")
    cell?.textLabel?.text = postData[indexPath.row]

    return cell!
}


}

Answer 1

调整视图确实加载到以下内容。您必须声明字典才能正确读取和使用Firebase中的数据。

override func viewDidLoad() {
    super.viewDidLoad()

    gallonsTXT.delegate = self
    gallonsTXT.dataSource = self

    ref = Database.database().reference()

    databaseHandle = ref?.child("Total gallons:").observe(.childAdded, with: { (snapshot) in

        print(snapshot.value) 

        if let dict = snapshot.value as? [String: Any] {
        let post = dict["your data key"] as! String

        self.postData.append(actualPost)
        self.tableView.reloadData()

              }

    })
    // Do any additional setup after loading the view, typic    ally from a nib.
}

如果这不起作用，请在文本字段中强制展开文本，然后查看是否产生nil错误。在CellForRowAtIndexPath

中

iOS Firebase-将（snapshot.value）打印到TableView

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