Displaying multiple driver annotations around the user (with Database) - ios

Question

Im new in coding. is there a way to show multiple drivers around the user.
.
I've already figured out how to show a list of drivers near the user thru database, now I want the map to show the drivers near the user.
import UIKit
import Firebase
import FirebaseAuth
import FirebaseDatabase
import MapKit
class EmployeeTableViewController: UITableViewController, CLLocationManagerDelegate {
#IBOutlet weak var jobsAvailableMap: MKMapView!
var jobRequests : [DataSnapshot] = []
var locationManager = CLLocationManager()
var employeeLocation = CLLocationCoordinate2D()
override func viewDidLoad() {
super.viewDidLoad()
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.requestWhenInUseAuthorization()
locationManager.startUpdatingLocation()
Database.database().reference().child("JobRequests").observe(.childAdded) { (snapshot) in
if let jobRequestDictionary = snapshot.value as? [String:AnyObject] {
if let employeeLat = jobRequestDictionary["employeeLat"] as? Double {
} else {
self.jobRequests.append(snapshot)
self.tableView.reloadData()
}
}
}
Timer.scheduledTimer(withTimeInterval: 3, repeats: true) { (timer) in
self.tableView.reloadData()
}
}
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
if let coord = manager.location?.coordinate {
employeeLocation = coord
}
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete implementation, return the number of rows
return jobRequests.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "jobRequestCell", for: indexPath)
let snapshot = jobRequests[indexPath.row]
if let jobRequestDictionary = snapshot.value as? [String:AnyObject] {
if let email = jobRequestDictionary["email"] as? String {
if let lat = jobRequestDictionary["lat"] as? Double {
if let lon = jobRequestDictionary["lon"] as? Double {
let employeeCLLocation = CLLocation(latitude: employeeLocation.latitude, longitude: employeeLocation.longitude)
let employerCLLocation = CLLocation(latitude: lat, longitude: lon)
let distance = employeeCLLocation.distance(from: employerCLLocation) / 1000
let roundedDistance = round(distance * 100) / 100
cell.textLabel?.text = "\(email) - \(roundedDistance)km away"
}
}
}
}
return cell
}
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let snapshot = jobRequests[indexPath.row]
performSegue(withIdentifier: "acceptSegue", sender: snapshot)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if let acceptVC = segue.destination as? AcceptJobViewController {
if let snapshot = sender as? DataSnapshot {
if let jobRequestDictionary = snapshot.value as? [String:AnyObject] {
if let email = jobRequestDictionary["email"] as? String {
if let lat = jobRequestDictionary["lat"] as? Double {
if let lon = jobRequestDictionary["lon"] as? Double {
acceptVC.requestEmail = email
let location = CLLocationCoordinate2D(latitude: lat, longitude: lon)
acceptVC.requestLocation = location
acceptVC.employeeLocation = employeeLocation
}
}
}
}
}
}
}
#IBAction func logoutTapped(_ sender: Any) {
try? Auth.auth().signOut()
navigationController?.dismiss(animated: true, completion: nil)
}
}
I'm trying to look for tutorials online but most are not connected to Firebase Database.

Answer 1

You can use addAnnotation method.
e.g. (no guarantee you can build the following code)
func addDriverAnnotation(snapshot: DataSnapshot){
if let jobRequestDictionary = snapshot.value as? [String:AnyObject] {
if let email = jobRequestDictionary["email"] as? String {
if let lat = jobRequestDictionary["lat"] as? Double {
if let lon = jobRequestDictionary["lon"] as? Double {
let annotation = MKAnnotation()
annotation.coordinate = CLLocationCoordinate2DMake(lat, lon)
annotation.title = "title"
annotation.subtitle = "subtitle"
self.jobsAvailableMap.addAnnotation(annotation)
}
}
}
}
}
You need to call this method in Database.database()... method.
Database.database().reference().child("JobRequests").observe(.childAdded) { (snapshot) in
if let jobRequestDictionary = snapshot.value as? [String:AnyObject] {
if let employeeLat = jobRequestDictionary["employeeLat"] as? Double {
} else {
self.jobRequests.append(snapshot)
self.tableView.reloadData()
self.addDriverAnnotation(snapshot: snapshot)
}
}
}