ios - Swift 3 在检索数据时在 firebase 中获得零值

Question

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Answer 1

将数据附加到数组后重新加载 TableView :

func retriveData() {
    ref.observe(.childAdded, with: { (snapshot) in

        if let snapshot = snapshot.children.allObjects as? [DataSnapshot] {

            for snap in snapshot {
                if let userDict = snap.value as? Dictionary<String,AnyObject> {
                    print("user dict - \(String(describing: userDict["name"]))")
                    let username = userDict["name"] as? String
                    self.uname.append(username!)
                }
            }
                tableView.reloadData()

        }
    })
}