var country = ["USA", "CANADA"]

countries
  Canada
     states
        Alberta
        British Columbia
  USA
     states
        Alabama
        Arkansas

import UIKit
import FirebaseDatabase

class ViewController: UIViewController, UIPickerViewDelegate,         UIPickerViewDataSource {

@IBOutlet weak var countryPicker: UIPickerView!


//let country = ["USA", "Canada"] I am no longer using this hardcoded array

var countrySelected = String()
var action = 0

override func viewDidLoad() {
    super.viewDidLoad()

    //this is where I reach out to the database
    let database = Database.database().reference()
    database.child("countries").observeSingleEvent(of: .value) { (Snapshot) in
        print(Snapshot)
    }

//add code here that takes the snapshot and appends the the array below
var country = string()

countrySelected = country[0]
    countryPicker.selectRow(action, inComponent: 0, animated: false)
    //print(countrySelected)
}

func numberOfComponents(in pickerView: UIPickerView) -> Int {
    return 1
}

func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
    return country.count
}


func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
    return country[row]
}

func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
    countrySelected = country[row]
    action = country.firstIndex(of: countrySelected)!
    //print(countrySelected)
}