Swift Firebase TableView distance from current user - swift

Question

I am trying to list the distance in a label from the current user to the business location. I keep on getting a error saying "fatal error: unexpectedly found nil while unwrapping an optional value" and I am getting this error on a firebase line, yet I know for a fact I have everything spelled correctly and the call works to get the values. I get the error on line:
"let lat = Double(locationValue["businessLatitude"] as! String)".
Any help would be greatly appreciated
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! RegisteredLocationsCell
let user : NSDictionary?
if searchController.isActive && searchController.searchBar.text != ""{
user = filteredUsers[indexPath.row]
FIRDatabase.database().reference().child("Businesses").observe(.value, with: { snapshot in
if let locationData = snapshot.value as? NSDictionary {
let locationValue = locationData as! [String: Any]
let lat = Double(locationValue["businessLatitude"] as! String)
let long = Double(locationValue["businessLongitude"] as! String)
let businessLocation = CLLocation(latitude: lat!, longitude: long!)
let latitude = self.locationManager.location?.coordinate.latitude
let longitude = self.locationManager.location?.coordinate.longitude
let userLocation = CLLocation(latitude: latitude!, longitude: longitude!)
let distanceInMeters : Double = userLocation.distance(from: businessLocation)
let distanceInMiles : Double = ((distanceInMeters.description as String).doubleValue * 0.00062137)
cell.businessDistance.text = "\(distanceInMiles.string(2)) miles away"
}
})
} else {
user = self.usersArray[indexPath.row]
FIRDatabase.database().reference().child("Businesses").observe(.value, with: { snapshot in
if let locationData = snapshot.value as? NSDictionary {
let locationValue = locationData as! [String: Any]
let lat = Double(locationValue["businessLatitude"] as! String)
let long = Double(locationValue["businessLongitude"] as! String)
let businessLocation = CLLocation(latitude: lat!, longitude: long!)
let latitude = self.locationManager.location?.coordinate.latitude
let longitude = self.locationManager.location?.coordinate.longitude
let userLocation = CLLocation(latitude: latitude!, longitude: longitude!)
let distanceInMeters : Double = userLocation.distance(from: businessLocation)
let distanceInMiles : Double = ((distanceInMeters.description as String).doubleValue * 0.00062137)
cell.businessDistance.text = "\(distanceInMiles.string(2)) miles away"
}
})
}
cell.businessName.text = String(user?["businessName"] as! String)
cell.businessStreet.text = String(user?["businessStreet"] as! String)
cell.businessCity.text = String(user?["businessCity"] as! String)
cell.businessState.text = String(user?["businessState"] as! String)
//cell.configure(businessName: user?["businessName"] as! String, businessStreet: user?["businessStreet"] as! String, businessCity: user?["businessCity"] as! String, businessState: user?["businessState"] as! String, businessDistance: user?["businessDistance"] as! String )
return cell
}
import UIKit
import Firebase
import MapKit
import CoreLocation
class RegisteredLocationsTableView: UITableViewController, UISearchResultsUpdating, CLLocationManagerDelegate, NSUserActivityDelegate {
#IBOutlet var followUsersTableView: UITableView!
let searchController = UISearchController(searchResultsController: nil)
var loggedInUser:FIRUser?
var loggedInUserData:NSDictionary?
var usersArray = [NSDictionary?]()
var filteredUsers = [NSDictionary?]()
var locationManager = CLLocationManager()
let distanceFormatter = MKDistanceFormatter()
var locationData: NSDictionary?
var geofences = [CLCircularRegion]()
var nameKeyDict:[String:String] = [:]
var databaseRef = FIRDatabase.database().reference()
override func viewDidLoad() {
super.viewDidLoad()
searchController.searchResultsUpdater = self
searchController.dimsBackgroundDuringPresentation = false
definesPresentationContext = true
tableView.tableHeaderView = searchController.searchBar
locationManager.delegate = self
locationManager.distanceFilter = kCLLocationAccuracyNearestTenMeters
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.startUpdatingLocation()
locationManager.stopUpdatingLocation()
databaseRef.child("Businesses").queryOrdered(byChild: "businessName").observe(.childAdded, with: { (snapshot) in
let key = snapshot.key
let snapshot = snapshot.value as? NSDictionary
snapshot?.setValue(key, forKey: "uid")
if(key == self.loggedInUser?.uid) {
print("Same as logged in user, so don't show!")
} else {
self.usersArray.append(snapshot)
//insert the rows
self.followUsersTableView.insertRows(at: [IndexPath(row:self.usersArray.count-1,section:0)], with: UITableViewRowAnimation.automatic)
}
}) { (error) in
print(error.localizedDescription)
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// MARK: - Table view data source
override func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if searchController.isActive && searchController.searchBar.text != ""{
return filteredUsers.count
}
return self.usersArray.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! RegisteredLocationsCell
let user : NSDictionary?
if searchController.isActive && searchController.searchBar.text != ""{
user = filteredUsers[indexPath.row]
FIRDatabase.database().reference().child("Businesses").observe(.childAdded, with: { snapshot in
if let locationValue = snapshot.value as? NSDictionary {
let lat = Double(locationValue["businessLatitude"] as! String)
let long = Double(locationValue["businessLongitude"] as! String)
let businessLocation = CLLocation(latitude: lat!, longitude: long!)
let latitude = self.locationManager.location?.coordinate.latitude
let longitude = self.locationManager.location?.coordinate.longitude
let userLocation = CLLocation(latitude: latitude!, longitude: longitude!)
let distanceInMeters : Double = userLocation.distance(from: businessLocation)
let distanceInMiles : Double = ((distanceInMeters.description as String).doubleValue * 0.00062137)
cell.businessDistance.text = "\(distanceInMiles.string(2)) miles away"
}
})
} else {
user = self.usersArray[indexPath.row]
FIRDatabase.database().reference().child("Businesses").observe(.childAdded, with: { snapshot in
if let locationValue = snapshot.value as? NSDictionary {
let lat = Double(locationValue["businessLatitude"] as! String)
let long = Double(locationValue["businessLongitude"] as! String)
let businessLocation = CLLocation(latitude: lat!, longitude: long!)
let latitude = self.locationManager.location?.coordinate.latitude
let longitude = self.locationManager.location?.coordinate.longitude
let userLocation = CLLocation(latitude: latitude!, longitude: longitude!)
let distanceInMeters : Double = userLocation.distance(from: businessLocation)
let distanceInMiles : Double = ((distanceInMeters.description as String).doubleValue * 0.00062137)
cell.businessDistance.text = "\(distanceInMiles.string(2)) miles away"
}
})
}
cell.businessName.text = String(user?["businessName"] as! String)
cell.businessStreet.text = String(user?["businessStreet"] as! String)
cell.businessCity.text = String(user?["businessCity"] as! String)
cell.businessState.text = String(user?["businessState"] as! String)
//cell.configure(businessName: user?["businessName"] as! String, businessStreet: user?["businessStreet"] as! String, businessCity: user?["businessCity"] as! String, businessState: user?["businessState"] as! String, businessDistance: user?["businessDistance"] as! String )
return cell
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
super.prepare(for: segue, sender: sender)
if segue.identifier == "BusinessProfiles" {
// gotta check if we're currently searching
if self.searchController.isActive && searchController.searchBar.text != "" {
if let indexPath = tableView.indexPathForSelectedRow {
let user = filteredUsers[indexPath.row]
let controller = segue.destination as? BusinessProfilesViewController
controller?.otherUser = user
}
} else {
if let indexPath = tableView.indexPathForSelectedRow {
let user = usersArray[indexPath.row]
let controller = segue.destination as? BusinessProfilesViewController
controller?.otherUser = user
}
}
}
}
func updateSearchResults(for searchController: UISearchController) {
filterContent(searchText: self.searchController.searchBar.text!)
}
func filterContent(searchText:String) {
self.filteredUsers = self.usersArray.filter { user in
let username = user!["businessName"] as? String
return(username?.lowercased().contains(searchText.lowercased()))!
}
tableView.reloadData()
}
}

Answer 1

I think you need to add .childAdded as observe eventtype
Try this:
FIRDatabase.database().reference().child("Businesses").observe(.childAdded, with: { snapshot in
if let locationValue = snapshot.value as? [String: AnyObject] {
let lat = Double(locationValue["businessLatitude"] as! String)
let long = Double(locationValue["businessLongitude"] as! String)
let businessLocation = CLLocation(latitude: lat!, longitude: long!)
let latitude = self.locationManager.location?.coordinate.latitude
let longitude = self.locationManager.location?.coordinate.longitude
let userLocation = CLLocation(latitude: latitude!, longitude: longitude!)
let distanceInMeters : Double = userLocation.distance(from: businessLocation)
let distanceInMiles : Double = ((distanceInMeters.description as String).doubleValue * 0.00062137)
cell.businessDistance.text = "\(distanceInMiles.string(2)) miles away"
}
})
Update:
You need to remove the FIRDatabse calls from cellForRowAt method and modify your call in viewDidLoad as follows:
databaseRef.child("Businesses").queryOrdered(byChild: "businessName").observe(.childAdded, with: { (snapshot) in
let key = snapshot.key
if(key == self.loggedInUser?.uid) {
print("Same as logged in user, so don't show!")
} else {
if let locationValue = snapshot.value as? [String: AnyObject] {
let lat = Double(locationValue["businessLatitude"] as! String)
let long = Double(locationValue["businessLongitude"] as! String)
let businessLocation = CLLocation(latitude: lat!, longitude: long!)
let latitude = self.locationManager.location?.coordinate.latitude
let longitude = self.locationManager.location?.coordinate.longitude
let userLocation = CLLocation(latitude: latitude!, longitude: longitude!)
let distanceInMeters : Double = userLocation.distance(from: businessLocation)
let distanceInMiles : Double = ((distanceInMeters.description as String).doubleValue * 0.00062137)
let distanceLabelText = "\(distanceInMiles.string(2)) miles away"
var singleChildDictionary = locationValue
singleChildDictionary["distanceLabelText"] = distanceLabelText
self.usersArray.append(singleChildDictionary)
}
//insert the rows
self.followUsersTableView.insertRows(at: [IndexPath(row:self.usersArray.count-1,section:0)], with: UITableViewRowAnimation.automatic)
}
}) { (error) in
print(error.localizedDescription)
}
}
Then in cellForRowAt method
add this at the end like you are assigning other values
cell.businessDistance.text = String(user?["distanceLabelText"] as! String)