Question

这是我数据库的结构。我使用uuid将每个事件存储为根节点＆＃34; events＆＃34;下的唯一标识符。

events:
     uuid:
        name: summer festival 2017
        site: vegas
        participants:
           employeeID1: true
           employeeID2: true

我有一个UITableview有3列，我希望这个表显示以下数据

Colum1(event name)       Column2(site)          Column2(# of Participants) 
summer festival 2017     vegas                  2000

我尝试了这段代码，但它没有成功。请帮忙。

let myRef = ref?.child("events")

myRef?.queryOrdered(byChild: "name").observe(.childAdded, with: { (snapshot) in

            for child in snapshot.children {
                let snap = child as! DataSnapshot
                if let eventName = snap.value["name"] as String {
                    self.events.append(eventName)
                }
            }

        })

Answer 1

这是您可以尝试的代码。希望它能帮助你！

//TableView outlet
@IBOutlet weak var namesTable: UITableView!

//Array to save all event Names
var names = [String]()

//Database handler Object
var readData = DatabaseReference()

//I use a separate Dictionary to take snapshot out of handler if required
var postData = [String:AnyObject]()

//make use of serrate function or calling didLoad 
override func viewDidLoad() {
    super.viewDidLoad()

//Database reference to Fetch Data
readData = Database.database().reference()

//here is a databaseHandler which fetch all events data at once
    self.databaseHandler = self.readData.child("events").observe(.value, with: { (snapshot) in
        self.postData = ((snapshot.value) as? [String : AnyObject]!)!

        //print data to see if you require 
        //print it to generate loop for required things
        print(self.postData)

        //make snapshot as [string:anyobject]
        if let snapDict = snapshot.value as? [String:AnyObject]{

            ////here is a loop which will run after you get your snapshot
            for each in snapDict{
                 //you will get all your names in a array all at once
                let artistName = each.value["name"] as! String

                //use this array to save all event name
                self.names.append(artistName)

            }
            //remove ypur datasource and delegate from Storyboard
            //here you can provide datasource and delegate
            //if on same controller you have multiple functionality 
            //write reload table line here with datasource and delegate
            self.namesTable.dataSource = self
            self.namesTable.delegate = self
        }
    })
}

TableView代理

 func numberOfSectionsInTableView(tableView: UITableView) -> Int {
    return 1
}

func tableView(_ tableView:UITableView, numberOfRowsInSection section:Int) -> Int
{
    return names.count

}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
{
    let cell = self.namesTable.dequeueReusableCell(withIdentifier: "Cell")!
    cell.textLabel?.text = names[indexPath.row]
    return cell
}

Swift - 如何从Firebase检索多个值并在UITABLEVIEW上显示它们

1 个答案: