I am trying to create a function in my app that will guide the user to a marker I have created. This is the code I am using, it works great, It gets the users current location and show it on the map. But how can I get a directions to a marker?
Any awnser will be helpful
class Karta: UIViewController, CLLocationManagerDelegate {
@IBOutlet var mapView: GMSMapView!
let locationManager = CLLocationManager()
override func viewDidLoad() {
super.viewDidLoad()
//allow app to track user
locationManager.delegate = self
locationManager.requestWhenInUseAuthorization()
//set out a marker on the map
var marker = GMSMarker()
marker.position = CLLocationCoordinate2DMake(56.675907, 12.858798)
marker.appearAnimation = kGMSMarkerAnimationPop
marker.icon = UIImage(named: "flag_icon")
marker.map = mapView
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "Types Segue" {
let navigationController = segue.destinationViewController as UINavigationController
}
}
func locationManager(manager: CLLocationManager!, didChangeAuthorizationStatus status: CLAuthorizationStatus) {
//If map is being used
if status == .AuthorizedWhenInUse {
var myLocation = mapView
locationManager.startUpdatingLocation()
mapView.myLocationEnabled = true
mapView.settings.myLocationButton = true
}
}
func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!) {
if let location = locations.first as? CLLocation {
mapView.camera = GMSCameraPosition(target: location.coordinate, zoom: 15, bearing: 0, viewingAngle: 0)
locationManager.stopUpdatingLocation()
}
}
}
Unlike Apple's MapKit, the Google Maps SDK for iOS does not natively include a way to perform route calculations.
Instead, you need to use the Google Directions API: https://developers.google.com/maps/documentation/directions/. It is an HTTP-only API, and Google does not provide any SDK as of today, but you can easily write your own wrapper yourself, or choose one of the many options available on Github:
So i recently just solved this issue, here is my Swift 3 implementation using the latest version of Alamofire (4.3)
func fetchMapData() {
let directionURL = "https://maps.googleapis.com/maps/api/directions/json?" +
"origin=\(originAddressLat),\(originAddressLng)&destination=\(destinationAddressLat),\(destinationAddressLong)&" +
"key=YOUROWNSERVERKEY"
Alamofire.request(directionURL).responseJSON
{ response in
if let JSON = response.result.value {
let mapResponse: [String: AnyObject] = JSON as! [String : AnyObject]
let routesArray = (mapResponse["routes"] as? Array) ?? []
let routes = (routesArray.first as? Dictionary<String, AnyObject>) ?? [:]
let overviewPolyline = (routes["overview_polyline"] as? Dictionary<String,AnyObject>) ?? [:]
let polypoints = (overviewPolyline["points"] as? String) ?? ""
let line = polypoints
self.addPolyLine(encodedString: line)
}
}
}
func addPolyLine(encodedString: String) {
let path = GMSMutablePath(fromEncodedPath: encodedString)
let polyline = GMSPolyline(path: path)
polyline.strokeWidth = 5
polyline.strokeColor = .blue
polyline.map = whateverYourMapViewObjectIsCalled
}
Disclaimer:Swift 2
func addOverlayToMapView(){
let directionURL = "https://maps.googleapis.com/maps/api/directions/json?origin=\(srcLocation.coordinate.latitude),\(srcLocation.coordinate.longitude)&destination=\(destLocation.coordinate.latitude),\(destLocation.coordinate.longitude)&key=Your Server Key"
Alamofire.request(.GET, directionURL, parameters: nil).responseJSON { response in
switch response.result {
case .Success(let data):
let json = JSON(data)
print(json)
let errornum = json["error"]
if (errornum == true){
}else{
let routes = json["routes"].array
if routes != nil{
let overViewPolyLine = routes![0]["overview_polyline"]["points"].string
print(overViewPolyLine)
if overViewPolyLine != nil{
self.addPolyLineWithEncodedStringInMap(overViewPolyLine!)
}
}
}
case .Failure(let error):
print("Request failed with error: \(error)")
}
}
}
Using the points, we now create the Path from two points using fromEncodedPath
func addPolyLineWithEncodedStringInMap(encodedString: String) {
let path = GMSMutablePath(fromEncodedPath: encodedString)
let polyLine = GMSPolyline(path: path)
polyLine.strokeWidth = 5
polyLine.strokeColor = UIColor.yellowColor()
polyLine.map = mapView
}
Its Very Simple if you added a Google map SDK in your iOS Project and if you want to implement get google map direction lines between two different directions i have made as demo code in simple way understand using swift 2.3 try it, modify it and use it.!!!
Note: Dont Forgot to change your lat long you want and API Key (You may Use API key with None Restrictions on Google API Manager Credential Section)
func callWebService(){
let url = NSURL(string: "https://maps.googleapis.com/maps/api/directions/json?origin=\(18.5235),\(73.7184)&destination=\(18.7603),\(73.8630)&key=AIzaSyDxSgGQX6jrn4iq6dyIWAKEOTneZ3Z8PtU")
let request = NSURLRequest(URL: url!)
let config = NSURLSessionConfiguration.defaultSessionConfiguration()
let session = NSURLSession(configuration: config)
let task = session.dataTaskWithRequest(request, completionHandler: {(data, response, error) in
// notice that I can omit the types of data, response and error
do{
if let jsonResult = try NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.MutableContainers) as? NSDictionary {
//print(jsonResult)
let routes = jsonResult.valueForKey("routes")
//print(routes)
let overViewPolyLine = routes![0]["overview_polyline"]!!["points"] as! String
print(overViewPolyLine)
if overViewPolyLine != ""{
//Call on Main Thread
dispatch_async(dispatch_get_main_queue()) {
self.addPolyLineWithEncodedStringInMap(overViewPolyLine)
}
}
}
}
catch{
print("Somthing wrong")
}
});
// do whatever you need with the task e.g. run
task.resume()
}
func addPolyLineWithEncodedStringInMap(encodedString: String) {
let camera = GMSCameraPosition.cameraWithLatitude(18.5204, longitude: 73.8567, zoom: 10.0)
let mapView = GMSMapView.mapWithFrame(CGRect.zero, camera: camera)
mapView.myLocationEnabled = true
let path = GMSMutablePath(fromEncodedPath: encodedString)
let polyLine = GMSPolyline(path: path)
polyLine.strokeWidth = 5
polyLine.strokeColor = UIColor.yellowColor()
polyLine.map = mapView
let smarker = GMSMarker()
smarker.position = CLLocationCoordinate2D(latitude: 18.5235, longitude: 73.7184)
smarker.title = "Lavale"
smarker.snippet = "Maharshtra"
smarker.map = mapView
let dmarker = GMSMarker()
dmarker.position = CLLocationCoordinate2D(latitude: 18.7603, longitude: 73.8630)
dmarker.title = "Chakan"
dmarker.snippet = "Maharshtra"
dmarker.map = mapView
view = mapView
}
来源：https://stackoverflow.com/questions/28784034/swift-ios-google-map-path-to-coordinate