I am learning about Google Maps and it works perfectly in a SingleView Application.
However I wanted to improve my app and have used a Tab Bar menu. I connected my ViewController with MapView to TabBarController and then map fails to load, there is just blank square instead of a map.
What did I do wrong?
EDIT:
class ViewController: UIViewController, CLLocationManagerDelegate {
#IBOutlet weak var mapView: GMSMapView!
let locationManager = CLLocationManager()
override func viewDidLoad() {
super.viewDidLoad()
self.locationManager.requestWhenInUseAuthorization()
self.locationManager.delegate = self
self.locationManager.desiredAccuracy = kCLLocationAccuracyBest
self.locationManager.startUpdatingLocation()
self.locationManager.startMonitoringSignificantLocationChanges()
}
//MARK: Shows Google Map
func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
self.locationManager.stopUpdatingLocation()
let locationArray = locations as NSArray
let locationObj = locationArray.lastObject as! CLLocation
let coord = locationObj.coordinate
mapView.camera = GMSCameraPosition(target: coord, zoom: 15, bearing: 0, viewingAngle: 0)
locationManager.stopUpdatingLocation()
}
func locationManager(manager: CLLocationManager, didChangeAuthorizationStatus status: CLAuthorizationStatus) {
if status == .AuthorizedWhenInUse {
locationManager.startUpdatingLocation()
mapView.myLocationEnabled = true
mapView.settings.myLocationButton = true
}
}
I think I found the problem, at least now everything works.
So I moved
mapView.myLocationEnabled = true
mapView.settings.myLocationButton = true
to func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) before locationManager.stopUpdatingLocation() and now it works.
However I do have a feeling that my code is bad, it uses stopUpdatingLocation() twice. In my case does it mean, that app will get user location only once when the app laods?
Related
I'm trying to make a maps application using Mapkit. but I can't seem to access the blue dot when i run the app on the simulator. i'm still new to Mapkit and any tips would be really appreciated. here's my code. p.s: i'm coding using Swift 4.2 and Xcode 11
import UIKit
import MapKit
import CoreLocation
class mapViewController: UIViewController {
let locationManager = CLLocationManager()
#IBOutlet weak var mapView: MKMapView!
override func viewDidLoad() {
super.viewDidLoad()
locationManager.requestWhenInUseAuthorization()
checkLocationServices()
}
func setupLocationManager() {
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
}
func centerViewOnUserLocation() {
if let location = locationManager.location?.coordinate {
let region = MKCoordinateRegion.init(center: location, latitudinalMeters: 10000, longitudinalMeters: 10000)
mapView.setRegion(region, animated: true)
}
}
func checkLocationServices() {
if CLLocationManager.locationServicesEnabled() {
setupLocationManager()
checkLocationAuthorization()
} else {
}
}
func checkLocationAuthorization() {
let pin = MKPointAnnotation()
switch CLLocationManager.authorizationStatus() {
case .authorizedWhenInUse:
mapView.showsUserLocation = true
mapView.addAnnotation(pin)
break
case .denied:
break
case .notDetermined:
locationManager.requestWhenInUseAuthorization()
break
case .restricted:
break
case .authorizedAlways:
break
}
}
}
extension mapViewController: CLLocationManagerDelegate {
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
// we'll be back
}
func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
//we'll be back
}
}
Check Simulator menu: Features > Location > Custom Location
Is there any way to reduce the number of times the locationManager updates? Currently is updated over 100 times in 30 seconds! My app collects the coordinates of the user and pushes this to a database, But I'm collecting too many coordinates.
Can I reduce the number of times the app updates user location?
func locationManager(_ manager: CLLocationManager, didUpdateLocations
locations: [CLLocation]) {
let lat = LocationManager.sharedInstance.location.coordinate.latitude
let long = LocationManager.sharedInstance.location.coordinate.longitude
}
Use CLLocationManager's distanceFilter property.
import UIKit
import MapKit
import CoreLocation
class ViewController: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate {
// MARK: - Variables
let locationManager = CLLocationManager()
// MARK: - IBOutlets
#IBOutlet weak var mapView: MKMapView!
// MARK: - IBAction
// MARK: - Life cycle
override func viewDidLoad() {
super.viewDidLoad()
/* delegate */
mapView.delegate = self
locationManager.delegate = self
locationManager.requestWhenInUseAuthorization()
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
/* checking location authorization */
checkLocationAuthorizationStatus()
if CLLocationManager.locationServicesEnabled() {
locationManager.startUpdatingLocation()
locationManager.allowsBackgroundLocationUpdates = true
locationManager.pausesLocationUpdatesAutomatically = false
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.distanceFilter = 20.0 // 20.0 meters
}
}
// MARK: - Authorization
func checkLocationAuthorizationStatus() {
if CLLocationManager.authorizationStatus() == .authorizedWhenInUse || CLLocationManager.authorizationStatus() == .authorizedAlways {
} else {
locationManager.requestWhenInUseAuthorization()
}
}
// MARK: - CLLocationManager delegate methods
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
guard let mostRecentLocation = locations.last else {
return
}
print(mostRecentLocation)
}
}
How i can draw user's route in `mapView?
My map is work, but route is not drawing.
No errors.
For example:
User's route
My code:
class ViewController: UIViewController, CLLocationManagerDelegate, MKMapViewDelegate {
#IBOutlet weak var mapView: MKMapView!
var locationManager: CLLocationManager!
override func viewDidLoad() {
super.viewDidLoad()
locationManager = CLLocationManager()
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.delegate = self
locationManager.requestAlwaysAuthorization()
locationManager.requestWhenInUseAuthorization()
locationManager.startUpdatingLocation()
locationManager.startUpdatingHeading()
mapView.delegate = self
mapView.showsUserLocation = true
mapView.mapType = MKMapType(rawValue: 0)!
mapView.userTrackingMode = MKUserTrackingMode(rawValue: 2)!
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func locationManager(manager: CLLocationManager!, didUpdateToLocation newlocation: CLLocation!, fromLocation oldLocation: CLLocation!) {
print("present location : \(newlocation.coordinate.latitude), \(newlocation.coordinate.longitude)")
if let oldLocationNew = oldLocation as CLLocation?{
let oldCoordinates = oldLocationNew.coordinate
let newCoordinates = newlocation.coordinate
var area = [oldCoordinates, newCoordinates]
var polyline = MKPolyline(coordinates: &area, count: area.count)
mapView.add(polyline)
}
}
func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer {
let pr = MKPolylineRenderer(overlay: overlay)
pr.strokeColor = UIColor.red
pr.lineWidth = 5
return pr
}
}
But it doesn't work.
I asume you used the following delegate to get the last position?
func locationManager(manager: CLLocationManager!,
didUpdateToLocation newlocation: CLLocation!,
fromLocation oldLocation: CLLocation!) {
The delegate above is deprecated in iOS 6. Now the following should be used:
func locationManager(_ manager: CLLocationManager,
didUpdateLocations locations: [CLLocation]) {
In order to get the last position, simply get the last object of the array:
locations.lastObject
Try the following code to draw user's route:
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
guard let newLocation = locations.last else {
return
}
guard let oldLocation = oldLocation else {
// Save old location
self.oldLocation = newLocation
return
}
let oldCoordinates = oldLocation.coordinate
let newCoordinates = newLocation.coordinate
var area = [oldCoordinates, newCoordinates]
let polyline = MKPolyline(coordinates: &area, count: area.count)
mapView.add(polyline)
// Save old location
self.oldLocation = newLocation
}
Currently my swift Application has a mapview with various annotations, is there a way when the user is walking from various annotations on the map to not be always locked in the north direction? I want the map to turn in the direction that they are walking instead of always pointing north.
Here is my current updatelocation function
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation])
{
let location = locations[0]
let myLocation:CLLocationCoordinate2D = CLLocationCoordinate2DMake(location.coordinate.latitude, location.coordinate.longitude)
let region:MKCoordinateRegion = MKCoordinateRegionMake(myLocation, noteTime.span)
map.setRegion(region, animated: true)
self.map.showsUserLocation = true
map.tintColor = UIColor(red:0.19, green:0.69, blue:0.73, alpha:1.0)
}
Should I declare it in here?
This example will update the rotation of the mapView to be pointing in the same direction as the user.
import UIKit
import MapKit
import CoreLocation
class ViewController: UIViewController, CLLocationManagerDelegate {
#IBOutlet weak var mapView: MKMapView!
let locationManager = CLLocationManager()
override func viewDidLoad() {
super.viewDidLoad()
locationManager.delegate = self
locationManager.startUpdatingHeading()
}
func locationManager(_ manager: CLLocationManager, didUpdateHeading newHeading: CLHeading) {
mapView.camera.heading = newHeading.magneticHeading
mapView.setCamera(mapView.camera, animated: true)
}
}
Is that what you were after? I hope that helps :)
The delegate Methods of CLLocationManager
didChangeAuthorizationStatus
and
didUpdateToLocation
are not getting called.
Location Always Usage Description key is already added in info.plist and I am getting notification also when i launch app for the first time.
I am able to see the google map, but i am not able to see current location, When i change location, its not getting updated. Basicaaly delegate methods are not getting called.
//code
import UIKit
import GoogleMaps
class ViewController: UIViewController,GMSMapViewDelegate {
#IBOutlet weak var mapViewTest: GMSMapView!
let locationManager = CLLocationManager()
var currentLocation :CLLocation = CLLocation(latitude: 0.0, longitude: 0.0)
var currentLatitude : Double = 0.0
var currentLongitude : Double = 0.0
override func viewDidLoad()
{
super.viewDidLoad()``
locationManager.delegate = self
if (CLLocationManager.locationServicesEnabled())
{
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.allowsBackgroundLocationUpdates = true
locationManager.requestAlwaysAuthorization()
locationManager.startUpdatingLocation()
}
// Do any additional setup after loading the view, typically from a nib.
}
}
extension ViewController : CLLocationManagerDelegate
{
func locationManager(manager: CLLocationManager, didChangeAuthorizationStatus status: CLAuthorizationStatus)
{
if status == .authorizedAlways
{
if(CLLocationManager .locationServicesEnabled())
{
locationManager.startUpdatingLocation()
mapViewTest.isMyLocationEnabled = true
mapViewTest.settings.myLocationButton = true
}
}
}
func locationManager(manager: CLLocationManager, didUpdateToLocation newLocation: CLLocation, fromLocation oldLocation: CLLocation)
{
mapViewTest.camera = GMSCameraPosition(target: (newLocation.coordinate), zoom: 15, bearing: 0, viewingAngle: 0)
currentLocation = newLocation
currentLatitude = newLocation.coordinate.latitude
currentLongitude = newLocation.coordinate.longitude
}
func locationManager(manager: CLLocationManager, didFailWithError error: NSError)
{
print("Errors: " + error.localizedDescription)
}
}
From your code you are working with Swift 3, and in Swift 3 CLLocationManagerDelegate method's signature is changed like this.
func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
}
//func locationManager(_ manager: CLLocationManager, didUpdateTo newLocation: CLLocation,
from oldLocation: CLLocation) is deprecated with below one
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
}
func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
}
Check Apple Documentation on CLLocationManagerDelegate for more details.
After checking your code i found some changes you needs to do as follow,
note : I have only added the code having issue here that of location manager
import UIKit
import CoreLocation
class ViewController: UIViewController {
let locationManager = CLLocationManager()
var currentLocation :CLLocation = CLLocation(latitude: 0.0, longitude: 0.0)
var currentLatitude : Double = 0.0
var currentLongitude : Double = 0.0
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
locationManager.delegate = self
if (CLLocationManager.locationServicesEnabled())
{
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.allowsBackgroundLocationUpdates = true
locationManager.requestAlwaysAuthorization()
locationManager.startUpdatingLocation()
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
extension ViewController : CLLocationManagerDelegate {
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
}
func locationManager(_ manager: CLLocationManager, didFinishDeferredUpdatesWithError error: Error?) {
print("Errors: " + (error?.localizedDescription)!)
}
}
Also add below lines in .plist file if not added,
<key>NSLocationWhenInUseUsageDescription</key>
<string>$(PRODUCT_NAME) location use</string>
<key>NSLocationAlwaysUsageDescription</key>
<string>$(PRODUCT_NAME) always uses location </string>
Add these two properties in your info.plist
NSLocationWhenInUseUsageDescription
NSLocationAlwaysUsageDescription
you need to put the mapview delegate to self.
try this:
override func viewDidLoad() {
super.viewDidLoad()
// User Location Settings
locationManager.delegate = self
locationManager.requestWhenInUseAuthorization()
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.startUpdatingLocation()
// Google Maps Delegate
mapView.delegate = self
}
// View will appear
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
// Google maps settings
mapView.isMyLocationEnabled = true
mapView.settings.myLocationButton = true
// Get location if autorized
if (CLLocationManager.authorizationStatus() == CLAuthorizationStatus.authorizedWhenInUse) {
let (latitude, longitude) = self.getLocation()
mapView.camera = GMSCameraPosition.camera(
withLatitude: latitude,
longitude: longitude,
zoom: 14)
}
}
//Get the user location
func getLocation() -> (latitude: CLLocationDegrees, longitude: CLLocationDegrees) {
let latitude = (locationManager.location?.coordinate.latitude)!
let longitude = (locationManager.location?.coordinate.longitude)!
return (latitude, longitude)
}