Getting user's location not working after Swift 4 update - swift

Question

I've just updated to the Xcode 9 and Swift 4 and it has broken at lot of my functions. One of which being how I get the user's location, zoom in on it on launch, detecting annotation selection and various other tasks. They don't work at all. My view controller class code is below.
import UIKit
import MapKit
import Firebase
import FirebaseDatabase
import Pulley
import CoreLocation
class ChildMapViewController: UIViewController, CLLocationManagerDelegate, MKMapViewDelegate {
#IBOutlet weak var mapView: MKMapView!
let manager = CLLocationManager()
var isInitialized = false
func startBackgroundLocationUpdates() {
self.manager.delegate = self
manager.requestWhenInUseAuthorization()
manager.desiredAccuracy = kCLLocationAccuracyThreeKilometers
manager.pausesLocationUpdatesAutomatically = true
manager.activityType = .fitness
manager.allowsBackgroundLocationUpdates = true
manager.startMonitoringSignificantLocationChanges()
manager.startUpdatingLocation()
}
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
let location = locations[0]
if !isInitialized {
isInitialized = true
let span:MKCoordinateSpan = MKCoordinateSpanMake(0.01, 0.01)
let myLocation:CLLocationCoordinate2D = CLLocationCoordinate2DMake(location.coordinate.latitude, location.coordinate.longitude)
let region:MKCoordinateRegion = MKCoordinateRegionMake(myLocation, span)
mapView.setRegion(region, animated: true)
self.mapView.showsUserLocation = true
}
}
struct loc {
let title: String
let latitude: Double
let longitude: Double
}
var locs = [
loc(title: "New York, NY", latitude: 40.713054, longitude: -74.007228),
]
func placeAnnotations() {
let annotations = locs.map { location -> MKAnnotation in
let annotation = MKPointAnnotation()
annotation.coordinate = CLLocationCoordinate2D(latitude: location.latitude, longitude: location.longitude)
annotation.title = location.title
return annotation
}
mapView.addAnnotations(annotations)
}
var position:PulleyPosition!
func mapView(_ didSelectmapView: MKMapView, didSelect view: MKAnnotationView) {
Shared.shared.annotation = view.annotation!
if Shared.shared.annotation is MKUserLocation {
Shared.shared.nameString = "My Location"
} else {
loadData()
}
}
func mapView(_ mapView: MKMapView, didDeselect view:
MKAnnotationView) {
let drawerContent = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "DrawerViewController")
if let drawer = self.parent?.parent as? PulleyViewController {
drawer.setDrawerContentViewController(controller: drawerContent, animated: false)
drawer.setDrawerPosition(position: PulleyPosition.partiallyRevealed, animated: true)
}
}
func loadData() {
let number = (Shared.shared.annotation?.title)!
if let number = number {
let ref = FIRDatabase.database().reference()
ref.child("safehouses").child("\(number)").observeSingleEvent(of: .value, with: { snapshot in
let snapDict = snapshot.value as? NSDictionary
let name = snapDict?["name"] as? String
let phone = snapDict?["phone"] as? String
let current = CLLocation(latitude: (self.manager.location?.coordinate.latitude)!, longitude: (self.manager.location?.coordinate.longitude)!)
let destination = CLLocation(latitude: Shared.shared.annotation.coordinate.latitude, longitude: Shared.shared.annotation.coordinate.longitude)
let distance2 = current.distance(from: destination)
let distance1 = round(distance2)
if distance1 >= 1000 {
if distance1 < 10000 {
let distance3 = distance1/1000
let distance = Double(round(10*distance3)/10)
Shared.shared.typeString = "Safehouse · " + String(distance) + " km"
} else {
let distance3 = distance1/1000
let distance = round(distance3)
Shared.shared.typeString = "Safehouse · " + String(distance) + " km"
}
} else {
let distance = self.forTailingZero(temp: distance1)
Shared.shared.typeString = "Safehouse · " + distance + " m"
}
if let name = name {
if let phone = phone {
Shared.shared.nameString = name
Shared.shared.phoneString = phone
let drawerContent = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "NewDrawerViewController")
if let drawer = self.parent?.parent as? PulleyViewController {
drawer.setDrawerContentViewController(controller: drawerContent, animated: false)
drawer.setDrawerPosition(position: PulleyPosition.partiallyRevealed, animated: true)
}
}
}
})
}
}
func forTailingZero(temp: Double) -> String{
var tempVar = String(format: "%g", temp)
return tempVar
}
func loop() {
let ref = FIRDatabase.database().reference()
ref.child("safehouses").observeSingleEvent(of: .value, with: { snapshot in
let snapDict = snapshot.value as? NSDictionary
let ii = snapDict?["number"] as? Int
let iii = Int(ii!)
var i = 1
while i <= iii{
let name = String(i)
ref.child("safehouses").child("\(i)").observeSingleEvent(of: .value, with: { snapshot in
let snapDict = snapshot.value as? NSDictionary
let longitude = snapDict?["longitude"]
as? String
let latitude = snapDict?["latitude"] as? String
if let longitude = longitude {
if let latitude = latitude {
let latitude1 = Double(latitude)
if let latitude1 = latitude1 {
let longitude1 = Double(longitude)
if let longitude1 = longitude1 {
self.locs.append(loc(title: name, latitude: latitude1, longitude: longitude1))
self.placeAnnotations()
}
}
}
}
})
i = i + 1
}
})
}
#IBOutlet weak var menuButton: UIBarButtonItem!
override func viewDidLoad() {
super.viewDidLoad()
self.revealViewController().rearViewRevealWidth = 175
self.revealViewController().toggleAnimationType = SWRevealToggleAnimationType.easeOut
if self.revealViewController() != nil {
menuButton.target = self.revealViewController()
menuButton.action = #selector(SWRevealViewController.revealToggle(_:))
self.view.addGestureRecognizer(self.revealViewController().panGestureRecognizer())
}
loop()
mapView.delegate = self
manager.delegate = self
manager.desiredAccuracy = kCLLocationAccuracyBest
manager.requestAlwaysAuthorization()
Shared.shared.mapView = self.mapView
startBackgroundLocationUpdates()
}
}
final class Shared {
static let shared = Shared()
var nameString : String!
var phoneString : String!
var annotation : MKAnnotation!
var mapView : MKMapView!
var typeString : String!
}

Answer 1

First add these property in info.plist
<key>NSLocationAlwaysAndWhenInUseUsageDescription</key>
<string>description1</string>
<key>NSLocationAlwaysUsageDescription</key>
<string>description2</string>
<key>NSLocationUsageDescription</key>
<string>description3</string>
<key>NSLocationWhenInUseUsageDescription</key>
<string>accept to get location</string>
<key>UIBackgroundModes</key>
And then after copy this view controller in your project
import UIKit
import CoreLocation
class ViewController: UIViewController,CLLocationManagerDelegate {
var locationManager:CLLocationManager!
override func viewDidLoad() {
super.viewDidLoad()
determineMyCurrentLocation()
// Do any additional setup after loading the view.
}
func determineMyCurrentLocation() {
locationManager = CLLocationManager()
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.requestAlwaysAuthorization()
locationManager!.allowsBackgroundLocationUpdates = true
locationManager!.pausesLocationUpdatesAutomatically = false
let value = locationManager.startMonitoringSignificantLocationChanges()
if CLLocationManager.locationServicesEnabled() {
locationManager.startUpdatingLocation()
}
}
func locationManager(_ manager: CLLocationManager, didStartMonitoringFor region: CLRegion) {
print("ankur :- \(region)")
}
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
let userLocation:CLLocation = locations[0] as CLLocation
print("user latitude = \(userLocation.coordinate.latitude)")
print("user longitude = \(userLocation.coordinate.longitude)")
}
func locationManager(_ manager: CLLocationManager, didFailWithError error: Error)
{
print("Error \(error)")
}
}
Last step :- Open Capabilities -> In background modes -> click on location updates
If any query comment it

Answer 2

You need to add these keys in info plist :
<key>UIBackgroundModes</key>
<array>
<string>location</string>
</array>