Read data from firebase and populate TableViewCell - ios

Question

Hello I have a tableviewcell where i can populate it with custom data from my pc, but i can't use my firebase data on the cell that i have made. I want to fill my cell with String and Int, not only Strings. My code is:
PlacesTableViewController Class
import UIKit
import FirebaseDatabase
class PlacesTableViewController: UITableViewController {
//MARK: Properties
#IBOutlet weak var placesTableView: UITableView!
//database reference
var dbRef:FIRDatabaseReference?
var places = [Places]()
var myList:[String] = []
//handler
var handle:FIRDatabaseHandle?
override func viewDidLoad() {
super.viewDidLoad()
dbRef = FIRDatabase.database().reference()
// Loads data to cell.
loadData()
}
// MARK: - Table view data source
override func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete implementation, return the number of rows
return places.count
//return myList.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
// Table view cells are reused and should be dequeued using a cell identifier.
let cellIdentifier = "PlacesTableViewCell"
guard let cell = tableView.dequeueReusableCell(withIdentifier: cellIdentifier, for: indexPath) as? PlacesTableViewCell else {
fatalError("The dequeued cell is not an instance of PlacesTableView Cell.")
}
let place = places[indexPath.row]
cell.placeLabel.text = place.name
cell.ratingControl.rating = place.rating
//cell.placeLabel.text = myList[indexPath.row]
//cell.ratingControl.rating = myRatings[indexPath.row]
return cell
}
//MARK: Private Methods
private func loadData() {
handle = dbRef?.child("placeLabel").observe(.childAdded, with: { (snapshot) in
if let item = snapshot.value as? String
{
self.myList.append(item)
self.placesTableView.reloadData()
print (item)
}
})
/* handle = dbRef?.child("rating").observe(.childAdded, with: { (snapshot) in
if let item = snapshot.value as? String
{
self.myList.append(item)
self.placesTableView.reloadData()
}
})*/
/*guard let place1 = Places(name: "Veranda", rating: 4) else {
fatalError("Unable to instantiate place1")
}
places += [place1]*/
}
}
Places Class
import UIKit
class Places {
//MARK: Properties
var name: String
var rating: Int
//MARK:Types
struct PropertyKey {
static let name = "name"
static let rating = "rating"
}
//MARK: Initialization
init?(name: String, rating: Int) {
// Initialize stored properties.
self.name = name
self.rating = rating
// Initialization should fail if there is no name or if the rating is negative.
// The name must not be empty
guard !name.isEmpty else {
return nil
}
// The rating must be between 0 and 5 inclusively
guard (rating >= 0) && (rating <= 5) else {
return nil
}
}
}
PlacesTableViewCell Class
import UIKit
import FirebaseDatabase
class PlacesTableViewCell: UITableViewCell, UITableViewDelegate {
//MARK: Properties
#IBOutlet weak var placeLabel: UILabel!
#IBOutlet weak var ratingControl: RatingControl!
override func awakeFromNib() {
super.awakeFromNib()
// Initialization code
}
override func setSelected(_ selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
// Configure the view for the selected state
}
}
Firebase Database

Answer 1

Assuming your database layout should instead look like this (see comments above):
...
placeLabel
|
-- XXY: "Veranda"
-- YYY: "Dio Con Dio"
rating
|
-- XXX: 4
-- YYY: 1
...
then try this:
private func loadData() {
dbRef!.child("placeLabel").observe(.childAdded) {
(snapshot) in
let label = snapshot.value as! String
self.updatePlace(snapshot.key, label: label)
}
dbRef!.child("rating").observe(.childAdded) {
(snapshot) in
let rating = snapshot.value as! Int
self.updatePlace(snapshot.key, rating: rating)
}
}
private var loadedLabels = [String: String]()
private var loadedRatings = [String: Int]()
private func updatePlace(_ key: String, label: String? = nil, rating: Int? = nil) {
if let label = label {
loadedLabels[key] = label
}
if let rating = rating {
loadedRatings[key] = rating
}
guard let label = loadedLabels[key], let rating = loadedRatings[key] else {
return
}
if let place = Places(name: label, rating: rating) {
places.append(place)
placesTableView.reloadData()
}
}
By the way, you can temporarily hack your database — using Firebase (nice!) web console — if you want to quickly validate the above solution.
Writing to Database. Try the following code to write the nodes in your database (i.e., this code reuses the same key across all place properties):
let key = dbRef!.child("placeLabel").childByAutoId().key
dbRef!.child("placeLabel").child(key).setValue(placeLab‌​el.text)
dbRef!.child("comment").child(key).setValue(commentText‌​Field.text)
dbRef!.child("rating").child(key).setValue(ratingContro‌​l.rating)
Hacking the Database. To edit the database manually, try:
open http://console.firebase.google.com
select your app
open database option
add a new node with the right key
delete the old node