[Swift] Firebase data read

 

아래와 같이 realtime database 설정한 후 라벨에 표현해 보았다.

var ref: DatabaseReference!
    
@IBOutlet var firstData: UILabel!

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view.

    ref = Database.database().reference()

    ref.child("firstData").observeSingleEvent(of: .value) {snapshot in
        print("---> \(snapshot)")
        let value = snapshot.value as? String ?? ""
        DispatchQueue.main.async {
            self.firstData.text = value
        }
    }
}