I'm trying to display the users current location and calculate the distance he traveled and i'm getting error at displaying it on distance1.text, can somebody please help me. Thanks in advance and I'm very new to iOS app development, currently using swift3
import UIKit
import MapKit
import CoreLocation
class MapView1: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate {
#IBOutlet weak var mapView: MKMapView!
#IBOutlet weak var distance1: UILabel!
let locationManager = CLLocationManager()
var startLocation:CLLocation!
var lastLocation: CLLocation!
var traveledDistance:Double = 0
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.locationManager.delegate = self
self.locationManager.desiredAccuracy = kCLLocationAccuracyBest
self.locationManager.requestWhenInUseAuthorization()
self.locationManager.startUpdatingLocation()
self.mapView.showsUserLocation = true
startLocation = nil
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
//MARK: Location Delegate Methods
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
let location = locations.last
let center1 = CLLocationCoordinate2D(latitude: location!.coordinate.latitude , longitude: location!.coordinate.longitude)
let region1 = MKCoordinateRegion(center: center1, span: MKCoordinateSpan(latitudeDelta: 0.01, longitudeDelta: 0.01))
self.mapView.setRegion(region1, animated: true)
self.locationManager.stopUpdatingLocation()
if startLocation == nil {
startLocation = location
}
let distanceBetween: CLLocationDistance =
location!.distance(from: startLocation)
distance1.text = String(format: "%.2f", distanceBetween)
}
func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
print("Error: " + error.localizedDescription)
}
}
Related
I have getting user's current location but getting this error at this line
let region : MKCoordinateRegion = MKCoordinateSpanMake(myLocation, span)
I am getting error at myLocation in above line
Cannot convert value of type 'CLLocationCoordinate2D' to expected argument type 'CLLocationDegrees' (aka 'Double')
I think there may be type casting problem or similar.
What should I do to handle this error I researched a lot of examples but none helped me.
import UIKit
import MapKit
import CoreLocation
class ViewController: UIViewController, CLLocationManagerDelegate {
let manager = CLLocationManager()
#IBOutlet weak var myMap: MKMapView!
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
let location = locations[0]
let span : MKCoordinateSpan = MKCoordinateSpanMake(1, 1)
let myLocation : CLLocationCoordinate2D = CLLocationCoordinate2DMake(location.coordinate.latitude, location.coordinate.longitude)
let region : MKCoordinateRegion = MKCoordinateSpanMake(myLocation, span)
myMap.setRegion(region, animated: true)
self.myMap.showsUserLocation = true
}
override func viewDidLoad() {
super.viewDidLoad()
manager.delegate = self
manager.desiredAccuracy = kCLLocationAccuracyBest
manager.requestWhenInUseAuthorization()
manager.startUpdatingLocation()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
You want MKCoordinateRegionMake, not MKCoordinateSpanMake.
And there's lots of other fixes you should make:
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
let location = locations[0]
let span = MKCoordinateSpanMake(0.01, 0.01)
let myLocation = location.coordinate
let region = MKCoordinateRegionMake(myLocation, span)
myMap.setRegion(region, animated: true)
self.myMap.showsUserLocation = true
}
I'm new to app development and I'm trying to get the user location to come up in the simulator but I keep getting the Use of unresolved identifier error. I have looked at other questions, which are very specific to their own projects, and have tried to approach my own app in a similar way but to not avail. Any help, por favor? Here's my code, and a link to a screenshot of Xcode.
import UIKit
import MapKit
import CoreLocation
class SecondViewController: UIViewController, CLLocationManagerDelegate {
//Map
#IBOutlet weak var map: MKMapView!
let manager = CLLocationManager()
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation])
{ let location = locations[0]
let span:MKCoordinateSpan = MKCoordinateSpanMake(0.01, 0.01)
let myLocation:CLLocationCoordinate2D = CLLocationCoordinate2DMake(location.coordinate.latitude, location.coordinate.longitude)
let region:MKCoordinateRegion = MKCoordinateRegionMake(myLocation, span)
self.map.showsUserLocation = true
}
override func viewDidLoad()
{
super.viewDidLoad()
manager.delegate = self
manager.desiredAccuracy = kCLLocationAccuracyBest
manager.requestWhenInUseAuthorization()
manager.startUpdatingLocation()
//This is where I get an error
map.setRegion(region, animated: true)**
}
Error: Use of unresolved identifier
Your let region:MKCoordinateRegion is a local identifier inside your delegate method:
func locationManager(_:didUpdateLocations) {...}
This is why you are getting Use of unresolved identifier. Make this identifier accessible throughout the class, the error will be gone. Like:
class SecondViewController: UIViewController, CLLocationManagerDelegate {
//Map
#IBOutlet weak var map: MKMapView!
var region = MKCoordinateRegion()
.......
.......
}
N.B: But this won't let you see anything in the map. Best way to see any output from your MapView is to put map.setRegion(region, animated: true) inside your delegate method:
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
let location = locations.first
let span = MKCoordinateSpanMake(0.01, 0.01)
let myLocation = CLLocationCoordinate2DMake((location?.coordinate.latitude)!, (location?.coordinate.longitude)!)
region = MKCoordinateRegionMake(myLocation, span)
map.setRegion(region, animated: true)
}
Use MKCoordinateRegion instance before viewdidload method
You can follow below code for reference.
class Test: UIViewController {
var region = MKCoordinateRegion()
override func viewDidLoad() {
super.viewDidLoad()
region = MKCoordinateRegionMake(myLocation, span)
}
}
You are getting Error because
the variable region inside viewDidLoad() method do not have access of region variable inside
viewDidLoad() method
//This is where I get an error
map.setRegion(region, animated: true)**
Solution :
Make region variable global to class so that that can be accessed from anywhere you want to.
Instead of this line inside func locationManager
let region:MKCoordinateRegion = MKCoordinateRegionMake(myLocation,span)
Use
self.region = MKCoordinateRegionMake(myLocation,span)
Here is complete code That you can use.
import UIKit
import MapKit
import CoreLocation
class SecondViewController: UIViewController, CLLocationManagerDelegate {
//Map
#IBOutlet weak var map: MKMapView!
//global variable
var region:MKCoordinateRegion = MKCoordinateRegion()
let manager = CLLocationManager()
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation])
{ let location = locations[0]
let span:MKCoordinateSpan = MKCoordinateSpanMake(0.01, 0.01)
let myLocation:CLLocationCoordinate2D = CLLocationCoordinate2DMake(location.coordinate.latitude, location.coordinate.longitude)
self.region = MKCoordinateRegionMake(myLocation, span)
self.map.showsUserLocation = true
}
override func viewDidLoad()
{
super.viewDidLoad()
manager.delegate = self
manager.desiredAccuracy = kCLLocationAccuracyBest
manager.requestWhenInUseAuthorization()
manager.startUpdatingLocation()
//This is where I get an error
map.setRegion(region, animated: true)**
}
//
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
And more important if you are using simulator then you have to enable location simulation.
I am new to Xcode and Swift and I am trying to simply make a map that shows the users current location and updates it. I have this so far:
import UIKit
import MapKit
import CoreLocation
class ViewController: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate {
#IBOutlet weak var map: MKMapView!
let locationManager = CLLocationManager()
var mapp = MKMapView.self
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
if (CLLocationManager.locationServicesEnabled())
{
self.locationManager.delegate = self
self.locationManager.desiredAccuracy = kCLLocationAccuracyBest
self.locationManager.requestWhenInUseAuthorization()
self.locationManager.startUpdatingLocation()
self.map.showsUserLocation = true
}
else
{
print("Location services are not enabled")
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func loadView() {
//let camera = GMSCameraPosition.camera(withLatitude: 36.2108, longitude: -81.6774, zoom: 15.0)
//let mapView = GMSMapView.map(withFrame: CGRect.zero, camera: camera)
//mapView.isMyLocationEnabled = true
//view = mapView
}
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation])
{
let location = locations.last
let center = CLLocationCoordinate2D(latitude: location!.coordinate.latitude, longitude: location!.coordinate.longitude)
let region = MKCoordinateRegion(center: center, span: MKCoordinateSpan(latitudeDelta: 0.002, longitudeDelta: 0.002))
self.map.setRegion(region, animated: true)
self.locationManager.stopUpdatingLocation()
}
func locationManager(_ manager: CLLocationManager, didFailWithError error: Error)
{
print("Errors: " + error.localizedDescription)
}
}
I have made a MapView in the storyboard and CTRL dragged it to the file (thus the #IBOutlet weak var map: MKMapView!). However, when I plug my phone in and simulate the app it gives me a "unexpectedly found nil while unwrapping an optional value" and after some print statements i found that it happened whenever I referenced the map variable. Why is this? Thanks!
In the comments of the original post, Rob answered the question:
"
Remove the loadView method. That's used only when you are programmatically creating views. When using storyboards (or NIBs), you put your configuration code in viewDidLoad, not loadView. – Rob"
thank you Rob
I have written Swift code for current location but the code isn't giving me the exact location as Android use to locate.
For me it just give me the Country location pointing but I need the exact location for my application.
Here is my code for location
import UIKit
import MapKit
import CoreLocation
class location: UIViewController , CLLocationManagerDelegate {
#IBOutlet weak var map: MKMapView!
var locationManager: CLLocationManager!
var address : String = ""
override func viewDidLoad() {
super.viewDidLoad()
//let dataProvider = GoogleDataProvider(
if (CLLocationManager.locationServicesEnabled())
{
locationManager = CLLocationManager()
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.requestWhenInUseAuthorization()
locationManager.startUpdatingLocation()
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
var start : CLLocation!
func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
start = locations.last
let center = CLLocationCoordinate2D(latitude: start!.coordinate.latitude, longitude: start!.coordinate.longitude)
let region = MKCoordinateRegion(center: center, span: MKCoordinateSpan(latitudeDelta: 0.01, longitudeDelta: 0.01))
self.map.setRegion(region, animated: true)
print("function called")
let annotation = MKPointAnnotation()
annotation.coordinate = center
annotation.title = "You are Here :)"
map.addAnnotation(annotation)
let geocoder = CLGeocoder()
geocoder.reverseGeocodeLocation(manager.location!, completionHandler: {
placemarks, error in
if (error != nil)
{
print("Reverse geocoder failed with error" + error!.localizedDescription)
return
}
if let pm = placemarks?.first {
self.displayLocationInfo(pm)
}
else
{
print("Problem with the data received from geocoder")
}
})
}
}
I am getting the users current location and dropping this as a println(). The idea is that I am going to hit a button to get the new location, however currently the app keeps updating constantly (every second) instead. I have tried moving the getLocation() function inside my IBAction but that crashed the thing. I have updated the info.plist so thats not a problem. Heres le code:
import UIKit
import CoreLocation
class ViewController: UIViewController, CLLocationManagerDelegate{
#IBOutlet var latitude : UILabel!
#IBOutlet var longitude : UILabel!
var locationManager = CLLocationManager()
var startLocation: CLLocation!
override func viewDidLoad() {
super.viewDidLoad()
locationManager = CLLocationManager()
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.delegate = self
locationManager.requestWhenInUseAuthorization()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func findMyLocation(sender: AnyObject){
startLocation = nil
locationManager.startUpdatingLocation()
}
func getLocation(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!){
var userLocation:AnyObject = locations[0] as! CLLocation
var strlat = String(format: "%.4f", userLocation.coordinate.latitude)
var strlong = String(format: "%.4f",userLocation.coordinate.longitude)
latitude.text = String(format: "%.4f", userLocation.coordinate.latitude)
longitude.text = String(format: "%.4f",userLocation.coordinate.longitude)
println("latitude: " + strlat)
println("longitide: " + strlong)
if startLocation == nil {
startLocation = userLocation as! CLLocation
locationManager.stopUpdatingLocation()
}
}
func locationManager(manager: CLLocationManager!,
didFailWithError error: NSError!) {
}
}
Move the locationManager.startUpdatingLocation() to your findMyLocation function. This will start the locationManager when your button is pressed and begin calling the didUpdateLocations Inside your if startLocation == nil add locationManager.stopUpdatingLocation() this will stop the locationManager after you have set your startLocation var. Every time the user presses the button the process will run again.
One additional note, you should add more code into the didUpdateLocations to check the accuracy and timestamp of the location before you use it as it may not be a valid/accurate location for what you are trying to do.
UPDATE:
Had a chance to validate and the code will work with the changes suggested. Here is what your final code should look like. I am also assuming you have set your plist entries for locations services and your simulator is set to simulate locaitons.
import UIKit
import CoreLocation
class ViewController: UIViewController, CLLocationManagerDelegate{
#IBOutlet var latitude : UILabel!
#IBOutlet var longitude : UILabel!
var locationManager : CLLocationManager! = CLLocationManager()
var startLocation: CLLocation!
override func viewDidLoad() {
super.viewDidLoad()
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.delegate = self
locationManager.requestWhenInUseAuthorization()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func findMyLocation(sender: AnyObject){
startLocation = nil
locationManager.startUpdatingLocation()
}
func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!){
var userLocation:AnyObject = locations[0] as! CLLocation
var strlat = String(format: "%.4f", userLocation.coordinate.latitude)
var strlong = String(format: "%.4f",userLocation.coordinate.longitude)
latitude.text = String(format: "%.4f", userLocation.coordinate.latitude)
longitude.text = String(format: "%.4f",userLocation.coordinate.longitude)
println("latitude: " + strlat)
println("longitide: " + strlong)
if startLocation == nil {
startLocation = userLocation as! CLLocation
locationManager.stopUpdatingLocation()
}
}
func locationManager(manager: CLLocationManager!, didFailWithError error: NSError!) {
println("error with location manager: " + error.description)
}
}