The below code worked just one time and now all of the sudden it is not showing a point of interest (POI). I tried it on two different machines and am getting the same behavior. This is what has me puzzled, is it the code or my simulator settings.
I cleaned the project, made sure I had the simulator on custom. I did have the longitude and latitude printing now all of a sudden it is not printing in the console either.
import UIKit
import MapKit
import CoreLocation
class MapViewController: UIViewController, CLLocationManagerDelegate {
#IBOutlet var map: MKMapView!
var manager:CLLocationManager!
var latitude:Double = 0.0
var longitude:Double = 0.0
var location:Double = 0.0
override func viewDidLoad() {
super.viewDidLoad()
print("init")
manager = CLLocationManager()
manager.delegate = self
manager.desiredAccuracy - kCLLocationAccuracyBest
manager.requestWhenInUseAuthorization()
}
func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
print("test test test")
let userLocation:CLLocation = locations[0]
self.latitude = userLocation.coordinate.latitude
self.longitude = userLocation.coordinate.longitude
let request = MKLocalSearchRequest()
request.naturalLanguageQuery = "Army Recruiting"
request.region = MKCoordinateRegionMakeWithDistance(userLocation.coordinate, 1600, 1600)
MKLocalSearch(request: request).startWithCompletionHandler { (response, error) in
guard error == nil else { return }
guard let response = response else { return }
guard response.mapItems.count > 0 else { return }
let randomIndex = Int(arc4random_uniform(UInt32(response.mapItems.count)))
let mapItem = response.mapItems[randomIndex]
mapItem.openInMapsWithLaunchOptions(nil)
}
print("\(self.longitude) \(self.latitude)")
}
----------------------UPDATE 1--------------------
Updating location via simulator
I have noticed the below function is not running:
func locationManager(manager: CLLocationManager, didUpdateLocations
locations: [CLLocation])
---------------------Update 2--------------------
The app worked once then stopped. Not sure what is going on. Yes I added NSLocationWhenInUseUsageDescription and NSLocationAlwaysUsageDescription
Couple of issues with your code:
override func viewDidLoad() {
super.viewDidLoad()
print("init")
manager = CLLocationManager()
manager.delegate = self
manager.desiredAccuracy - kCLLocationAccuracyBest
manager.requestWhenInUseAuthorization()
}
Replace with:
override func viewDidLoad() {
super.viewDidLoad()
print("init")
manager = CLLocationManager()
manager.delegate = self
manager.desiredAccuracy = kCLLocationAccuracyBest
manager.requestWhenInUseAuthorization()
manager.startUpdatingLocation()
}
ADDITIONALLY (for info)
You can create GPX files for different locations.
You can also simulate routes with in the GPX files - have a delve into the Apple Documentation which shows you hows to set the GPX files to your target build. https://developer.apple.com/library/ios/documentation/IDEs/Conceptual/iOS_Simulator_Guide/CustomizingYourExperienceThroughXcodeSchemes/CustomizingYourExperienceThroughXcodeSchemes.html
There is also a good tutorial here with links for creating GPX files and routes which i have used in the past and is very useful. https://blackpixel.com/writing/2013/05/simulating-locations-with-xcode.html
The simulator can have a set of hard coded locations, and you change them or disable them in the console of xcode.
It should look like this:
If you want to test real moving location you should test it on a device.
Related
I need to get the zipCode and the city in multiple viewControllers.
Here is how I'm currently doing it...
import CoreLocation
let locationManager = CLLocationManager()
class MyViewController: UIViewController, CLLocationManagerDelegate{
override func viewDidLoad() {
super.viewDidLoad()
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.requestWhenInUseAuthorization()
}
}
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
CLGeocoder().reverseGeocodeLocation(manager.location!, completionHandler: {(placemarks, error)-> Void in
if error != nil {
//AlertView to show the ERROR message
}
if placemarks!.count > 0 {
let placemark = placemarks![0]
self.locationManager.stopUpdatingLocation()
let zipCode = placemark.postalCode ?? ""
let city:String = placemark.locality ?? ""
// Do something with zipCode
// Do something with city
}else{
print("No placemarks found.")
}
})
}
func someFunction() {
locationManager.startUpdatingLocation()
}
Everything works fine but as you can see doing it this way in multiple viewController leads to a lot of code repetition (of course, I'm not showing the whole code).
What would be the most common way to retrieve the zipCode and city from CLLocationManager() in a more practical way from multiple viewControllers?
What I'm thinking is something like...
MyLocationManager.zipCode() // returns zipCode as a string
MyLocationManager.city() // returns city as a string
The usual thing is to have just one location manager in one persistent place that you can always get to from anywhere, like the app delegate or the root view controller.
I tried to implement a singleton CLLocationManager class, I think you can modify the following class to implement some additional methods.
import Foundation
class LocationSingleton: NSObject, CLLocationManagerDelegate {
private let locationManager = CLLocationManager()
private var latitude = 0.0
private var longitude = 0.0
static let shared = LocationSingleton()
private override init() {
super.init()
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.distanceFilter = kCLLocationAccuracyHundredMeters
locationManager.requestAlwaysAuthorization() // you might replace this with whenInuse
locationManager.startUpdatingLocation()
}
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
if let location = locations.last {
latitude = location.coordinate.latitude
longitude = location.coordinate.longitude
}
}
private func getLatitude() -> CLLocationDegrees {
return latitude
}
private func getLongitude() -> CLLocationDegrees {
return longitude
}
private func zipCode() {
// I think you can figure way out to implemet this method
}
private func city() {
// I think you can figure way out to implemet this method
}
}
I have an app that finds places near the user’s location, however, the app crashes the second time it runs with the exception:
fatal error: unexpectedly found nil while unwrapping an Optional value.
On line:
self.googleMapView.animate(toLocation: coordinates)
I checked and the googleMapView is nil but I don’t understand how it is nil or how it ran the first time. It only starts crashing on subsequent tries if I delete and reinstall the app it works fine on the first try but after that it keeps crashing even if I restart the app. Full code below
import UIKit
import GoogleMaps
import GooglePlacePicker
import MapKit
class MapViewController: UIViewController, CLLocationManagerDelegate {
var currentLongitude: CLLocationDegrees = 0
var currentLatitude: CLLocationDegrees = 0
var locationManager: CLLocationManager!
var placePicker: GMSPlacePickerViewController!
var googleMapView: GMSMapView!
#IBOutlet weak var mapViewContainer: MKMapView!
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
self.googleMapView = GMSMapView(frame: self.mapViewContainer.frame)
self.googleMapView.animate(toZoom: 18.0)
self.view.addSubview(googleMapView)
}
override func viewDidLoad() {
super.viewDidLoad()
self.locationManager = CLLocationManager()
self.locationManager.delegate = self
self.locationManager.requestAlwaysAuthorization()
self.locationManager.requestWhenInUseAuthorization()
self.locationManager.startUpdatingLocation()
}
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
if let location:CLLocation = locations.last {
self.currentLatitude = location.coordinate.latitude
self.currentLongitude = location.coordinate.longitude
}
else {
print("Location Error")
}
let coordinates = CLLocationCoordinate2DMake(self.currentLatitude, self.currentLongitude)
let marker = GMSMarker(position: coordinates)
marker.title = "I am here"
marker.map = self.googleMapView
self.googleMapView.animate(toLocation: coordinates)
}
private func locationManager(manager: CLLocationManager,
didFailWithError error: Error){
print("An error occurred while tracking location changes : \(error.localizedDescription)")
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
Crash is pretty self-explanatory:
You are setting your location's delegate in the viewDidLoad but creating the map in the viewDidAppear.
If the location was known by iOS, you will receive the message before viewDidAppear call so in the line : self.googleMapView.animate(toLocation: coordinates), your map is still nil
You can either define your map as optional : var googleMapView: GMSMapView?, or you can wait for your map to be defined to create your location Manager.
I have scoured the interwebs and stackoverflow, and I can't find a solution to my problem.
I am attempting to:
Get a user's current location (lat & long)
Calculate the distance between a user's current location and another location (lat & long) that I set internally
Return the distance in a list view
So far, I can accomplish this if I manually set my current location, but I need to to update.
I have had success returning my current location (I set it as Apple headquarters in the Simulator) in the log, but no success in the actual app or simulator.
Here's what I have:
import UIKit
import CoreLocation
import MapKit
class ViewController: UITableViewController, CLLocationManagerDelegate, MKMapViewDelegate {
override func prefersStatusBarHidden() -> Bool {
return true
}
var shops = [coffeeShop]()
var locationManager = CLLocationManager()
override func viewDidLoad() {
super.viewDidLoad()
// Ask for Authorisation from the User.
self.locationManager.requestAlwaysAuthorization()
// For use in foreground
self.locationManager.requestWhenInUseAuthorization()
if CLLocationManager.locationServicesEnabled() {
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.startUpdatingLocation()
}
loadShops()
}
func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
let locValue:CLLocationCoordinate2D = manager.location!.coordinate
print("locations = \(locValue.latitude) \(locValue.longitude)")
}
func loadShops() {
let currentLocation = CLLocation()
let currentLat = currentLocation.coordinate.latitude
let currentLong = currentLocation.coordinate.longitude
var myLocation = CLLocation(latitude: currentLat, longitude: currentLong)
let shopLocation1 = CLLocation(latitude: 39.7886939, longitude: -86.1547275)
let distance1 = myLocation.distanceFromLocation(shopLocation1) / 1000
let shop1 = coffeeShop(location: distance1)!
}
In addition, I have everything set in the info.plist and all of that good stuff.
HOW DO I MAKE THIS WORK!? * weeps softly *
Thanks in advance for all of your help!
I was able to use the following code to achieve what I needed. Sometimes you just gotta put it out there in the universe for the universe to respond on its own. Thanks everyone for the help!
let currentLat = self.locationManager.location!.coordinate.latitude
let currentLong = self.locationManager.location!.coordinate.longitude
I use CLLocationManager to request the user's location. However, if they are outside of New York City, I want to default to certain coordinates. Is there a way to check if they are in a certain city?
import UIKit
import CoreLocation
import GoogleMaps
private let kDefaultLatitude: Double = 40.713
private let kDefaultLongitude: Double = -74.000
private let kDefaultZoomLevel: Float = 16.0
class RootMapViewController: UIViewController {
#IBOutlet weak var mapView: GMSMapView!
let locationManager = CLLocationManager()
override func viewDidLoad() {
super.viewDidLoad()
fetchLocation()
}
private func fetchLocation() {
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.requestWhenInUseAuthorization()
locationManager.startUpdatingLocation()
}
}
// MARK: CLLocationManagerDelegate
extension RootMapViewController: CLLocationManagerDelegate {
func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
locationManager.stopUpdatingLocation()
let userCoordinates = locations[0].coordinate
// How do I check if the user is in NYC?
// if user is in nyc
centerMapOn(userCoordinates)
mapView.myLocationEnabled = true
mapView.settings.myLocationButton = true
// else default to Times Square
}
}
You can use reverse geocoding. For example you can place:
geocoder:CLGeocoder = CLGeocoder()
geocoder.reverseGeocodeLocation(locations[0],completionHandler{
if error == nil && placemarks.count > 0 {
let location = placemarks[0] as CLPlacemark
print(location.locality)
})
in func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation])
This is my code:
import Foundation
import CoreLocation
class ViewController: UIViewController, CLLocationManagerDelegate {
let locationManager = CLLocationManager()
#IBOutlet weak var locationLabel: UILabel!
var coord: CLLocationCoordinate2D?
override func viewDidLoad() {
super.viewDidLoad()
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.requestWhenInUseAuthorization()
if CLLocationManager.authorizationStatus() == CLAuthorizationStatus.Authorized {
locationManager.startUpdatingLocation()
println(coord!.longitude)
locationLabel.text = "location found"
}
func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!) {
var locationArray = locations as NSArray
var locationObj = locationArray.lastObject as CLLocation
coord = locationObj.coordinate
}
}
}
This code does not return anything (it should print the longitude). Which seems O.K because if I move
locationManager.startUpdatingLocation()
println(coord!.longitude)
out of the if statement, Xcode throws a runtime error and says it unexpectedly found nil while unwrapping an Optional value. I do not understand why though? The systems asks me permission to use my location fine.
Thanks!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
locationManager = CLLocationManager()
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.requestAlwaysAuthorization()
locationManager.startUpdatingLocation()
}
func locationManager(manager:CLLocationManager, didUpdateLocations locations:AnyObject[] {
println("locations = \(locations)")
gpsResult.text = "success"
}
Are you running on iOS8? Assuming so:
1.You need to initialize
self.locationManager = CLLocationManager()
2.Right after, call self.locationManager.requestAlwaysAuthorization(); (before self.locationManager.delegate = self )
3.Add these keys to Info.plist, using an external text editor (change the texts accordingly)
<key>NSLocationWhenInUseUsageDescription</key>
<string>This is needed for iOS8 and up (when in use)</string>
<key>NSLocationAlwaysUsageDescription</key>
<string>This is needed for iOS8 and up (always)</string>
4.The place where you call println(coord!.longitude) may be too early. Move it into the locationManager function.
Then it should display an alert asking for permission for using location services.