Draw route directions using Google Maps iOS - ios

Question

I am getting a GMSPolyline to custom location but I am not getting a route direction (GMSPolyline) from user location to some custom location.
What I have done is placed a GMSMapView and kept core location. I am updating the route in core location delegate method (locationManager: didUpdateLocations:).
I want to use Google Maps for iOS SDK since Apple Maps don't have directions in the country I need. My code is below:
- (void)viewDidLoad
{
[super viewDidLoad];
waypointStrings_ = [[NSMutableArray alloc]init];
GMSCameraPosition *camera = [GMSCameraPosition cameraWithLatitude:self.latitude longitude:self.longitude zoom:13];
mapView_ = [GMSMapView mapWithFrame:CGRectZero camera:camera];
mapView_.myLocationEnabled = YES;
self.view = mapView_;
CLLocationManager *locManager = [[CLLocationManager alloc] init];
if ( [CLLocationManager locationServicesEnabled] ) {
[locManager setDelegate:self];
[locManager setDesiredAccuracy:kCLLocationAccuracyBest];
[locManager startUpdatingLocation];
}
}
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
CLLocationCoordinate2D userCoordinate = [[locations lastObject] coordinate];
GMSMarker *marker = [GMSMarker markerWithPosition:CLLocationCoordinate2DMake(self.latitude,self.longitude)];
marker.map = mapView_;
NSString *majlisPositionString = [[NSString alloc] initWithFormat:#"%f,%f", self.latitude,self.longitude];
[waypointStrings_ addObject:majlisPositionString];
GMSMarker *userMarker = [GMSMarker markerWithPosition:CLLocationCoordinate2DMake(userCoordinate.latitude, userCoordinate.longitude)];
userMarker.map = mapView_;
NSString *userPositionString = [[NSString alloc] initWithFormat:#"%f,%f", userCoordinate.latitude, userCoordinate.longitude];
[waypointStrings_ addObject:userPositionString];
NSString *sensor = #"false";
NSArray *parameters = [NSArray arrayWithObjects:sensor, waypointStrings_, nil];
NSArray *keys = [NSArray arrayWithObjects:#"sensor", #"waypoints", nil];
NSDictionary *query = [NSDictionary dictionaryWithObjects:parameters forKeys:keys];
MDDirectionService *mds=[[MDDirectionService alloc] init];
SEL selector = #selector(addDirections:);
[mds setDirectionsQuery:query withSelector:selector withDelegate:self];
}
- (void)addDirections:(NSDictionary *)json {
NSDictionary *routes = [json objectForKey:#"routes"][0];
NSDictionary *route = [routes objectForKey:#"overview_polyline"];
NSString *overview_route = [route objectForKey:#"points"];
GMSPath *path = [GMSPath pathFromEncodedPath:overview_route];
GMSPolyline *polyline = [GMSPolyline polylineWithPath:path];
polyline.map = mapView_;
}

Answer 1

-(void)LoadMapRoute:(NSString*)SourceAddress andDestinationAddress:(NSString*)DestinationAdds
{
NSString *strUrl;
strUrl= [NSString stringWithFormat:#"http://maps.googleapis.com/maps/api/directions/json?origin=%#&destination=%#&sensor=false",SourceAddress,DestinationAdds];
strUrl=[strUrl stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSData *data =[NSData dataWithContentsOfURL:[NSURL URLWithString:strUrl]];
NSError* error;
if (data) {
NSDictionary* json = [NSJSONSerialization
JSONObjectWithData:data //1
options:kNilOptions
error:&error];
NSArray *arrRouts=[json objectForKey:#"routes"];
if ([arrRouts isKindOfClass:[NSArray class]]&&arrRouts.count==0) {
[self zoomToFitMapAnnotations:self.mapView];
return;
}
CLLocationCoordinate2D coordinates[2];
coordinates[0].latitude = [[CommonUtils checkNullString:[AppDelegate getAppDelegate].strLatitude] doubleValue];Current loaction latitude.
coordinates[0].longitude = [[CommonUtils checkNullString:[AppDelegate getAppDelegate].strLongitude] doubleValue];//Current loaction longitude.
coordinates[1].latitude = [[CommonUtils checkNullString:latitute] doubleValue];
coordinates[1].longitude = [[CommonUtils checkNullString:longitude] doubleValue];
if (CLLocationCoordinate2DIsValid(coordinates[1]) && CLLocationCoordinate2DIsValid(coordinates[0]))
{
//NSLog(#"Coordinate valid");
self.mapView.delegate=self;
CLLocation *location1 = [[CLLocation alloc] initWithLatitude:coordinates[0].latitude longitude:coordinates[0].longitude];
CLLocation *location2 = [[CLLocation alloc] initWithLatitude:coordinates[1].latitude longitude:coordinates[1].longitude];
CLLocationDistance kilometers = [location1 distanceFromLocation:location2] / 1000;
//NSLog(#"%f",kilometers);
self.lblRideViewkilometer.text=[NSString stringWithFormat:#"%f KM",kilometers];
// //NSLog(#"Distance i meters: %f", [location1 distanceFromLocation:location2]);
// self.polyline = [MKPolyline polylineWithCoordinates:coordinates count:2];
// [self.mapView setVisibleMapRect:[self.polyline boundingMapRect]];
//
//
// //If you want the route to be visible
// [self.mapView addOverlay:self.polyline];
} else {
//NSLog(#"Coordinate invalid");
}
NSArray* arrpolyline = [[[json valueForKeyPath:#"routes.legs.steps.polyline.points"] objectAtIndex:0] objectAtIndex:0]; //2
double srcLat=[[[[json valueForKeyPath:#"routes.legs.start_location.lat"] objectAtIndex:0] objectAtIndex:0] doubleValue];
double srcLong=[[[[json valueForKeyPath:#"routes.legs.start_location.lng"] objectAtIndex:0] objectAtIndex:0] doubleValue];
double destLat=[[[[json valueForKeyPath:#"routes.legs.end_location.lat"] objectAtIndex:0] objectAtIndex:0] doubleValue];
double destLong=[[[[json valueForKeyPath:#"routes.legs.end_location.lng"] objectAtIndex:0] objectAtIndex:0] doubleValue];
CLLocationCoordinate2D sourceCordinate = CLLocationCoordinate2DMake(srcLat, srcLong);
CLLocationCoordinate2D destCordinate = CLLocationCoordinate2DMake(destLat, destLong);
[self addAnnotationSrcAndDestination:sourceCordinate :destCordinate andAdds:nil andDestinationAddress:DestinationAdds];
// NSArray *steps=[[aary objectAtIndex:0]valueForKey:#"steps"];
// replace lines with this may work
polyLinesArray =[[NSMutableArray alloc]initWithCapacity:0];
for (int i = 0; i < [arrpolyline count]; i++)
{
NSString* encodedPoints = [arrpolyline objectAtIndex:i] ;
MKPolyline *route = [self polylineWithEncodedString:encodedPoints];
[polyLinesArray addObject:route];
}
self.polyline = [MKPolyline polylineWithCoordinates:coordinates count:2];
[self.mapView setVisibleMapRect:[self.polyline boundingMapRect]];
[self.mapView addOverlays:polyLinesArray];
self.mapView.delegate = self;
[self zoomToFitMapAnnotations:self.mapView];
}else{
// [self.btnDirection setEnabled:NO];
// [self ShowAlert:#"didn't find direction"];
}
}-(void)addAnnotationSrcAndDestination :(CLLocationCoordinate2D )srcCord :(CLLocationCoordinate2D)destCord andAdds:(NSString*)SourceAddress andDestinationAddress:(NSString*)DestinationAdds
{
MKPointAnnotation *sourceAnnotation = [[MKPointAnnotation alloc]init];
destAnnotation = [[MKPointAnnotation alloc]init];
sourceAnnotation.coordinate=srcCord;
destAnnotation.coordinate=destCord;
sourceAnnotation.title=SourceAddress;
CLLocation *LocationAtual = [[CLLocation alloc] initWithLatitude:destCord.latitude longitude:destCord.longitude];
CLGeocoder *geocoder = [[CLGeocoder alloc] init] ;
[geocoder reverseGeocodeLocation:LocationAtual
completionHandler:^(NSArray *placemarks, NSError *error)
{
if (error){
//NSLog(#"Geocode failed with error: %#", error);
return;
}
CLPlacemark *placemark = [placemarks objectAtIndex:0];
//NSLog(#"placemark.ISOcountryCode %#",placemark.ISOcountryCode);
//NSLog(#"locality %#",placemark.subLocality);
//NSLog(#"postalCode %#",placemark.postalCode);
destAnnotation.title=[NSString stringWithFormat:#"%# %# ",placemark.name,placemark.locality];
// [self.mapView.userLocation setTitle:[NSString stringWithFormat:#"%# %# ",placemark.name,placemark.locality]];
}];
// destAnnotation.title=DestinationAdds;
//destAnnotation.title=[NSString stringWithFormat:#"%#,%#,%#",[self.dictRetailerInfo objectForKey:#"street_address1"],[self.dictRetailerInfo objectForKey:#"city"],[self.dictRetailerInfo objectForKey:#"country"]];
// destAnnotation.title=nil;
[self.mapView addAnnotation:sourceAnnotation];
[self.mapView addAnnotation:destAnnotation];
}
- (MKPolyline *)polylineWithEncodedString:(NSString *)encodedString {
const char *bytes = [encodedString UTF8String];
NSUInteger length = [encodedString lengthOfBytesUsingEncoding:NSUTF8StringEncoding];
NSUInteger idx = 0;
NSUInteger count = length / 4;
CLLocationCoordinate2D *coords = calloc(count, sizeof(CLLocationCoordinate2D));
NSUInteger coordIdx = 0;
float latitude = 0;
float longitude = 0;
while (idx < length) {
char byte = 0;
int res = 0;
char shift = 0;
do {
byte = bytes[idx++] - 63;
res |= (byte & 0x1F) << shift;
shift += 5;
} while (byte >= 0x20);
float deltaLat = ((res & 1) ? ~(res >> 1) : (res >> 1));
latitude += deltaLat;
shift = 0;
res = 0;
do {
byte = bytes[idx++] - 0x3F;
res |= (byte & 0x1F) << shift;
shift += 5;
} while (byte >= 0x20);
float deltaLon = ((res & 1) ? ~(res >> 1) : (res >> 1));
longitude += deltaLon;
float finalLat = latitude * 1E-5;
float finalLon = longitude * 1E-5;
CLLocationCoordinate2D coord = CLLocationCoordinate2DMake(finalLat, finalLon);
coords[coordIdx++] = coord;
if (coordIdx == count) {
NSUInteger newCount = count + 10;
coords = realloc(coords, newCount * sizeof(CLLocationCoordinate2D));
count = newCount;
}
}
MKPolyline *polyline = [MKPolyline polylineWithCoordinates:coords count:coordIdx];
free(coords);
return polyline;
}
-(void)zoomToFitMapAnnotations:(MKMapView*)aMapView
{
if([aMapView.annotations count] == 0)
return;
CLLocationCoordinate2D topLeftCoord;
topLeftCoord.latitude = -90;
topLeftCoord.longitude = 180;
CLLocationCoordinate2D bottomRightCoord;
bottomRightCoord.latitude = 90;
bottomRightCoord.longitude = -180;
for(MKPointAnnotation *annotation in self.mapView.annotations)
{
if (![[annotation class] isEqual:[MKUserLocation class]]) {
topLeftCoord.longitude = fmin(topLeftCoord.longitude, annotation.coordinate.longitude);
topLeftCoord.latitude = fmax(topLeftCoord.latitude, annotation.coordinate.latitude);
bottomRightCoord.longitude = fmax(bottomRightCoord.longitude, annotation.coordinate.longitude);
bottomRightCoord.latitude = fmin(bottomRightCoord.latitude, annotation.coordinate.latitude);
}
}
MKCoordinateRegion region;
region.center.latitude = topLeftCoord.latitude - (topLeftCoord.latitude - bottomRightCoord.latitude) * 0.5;
region.center.longitude = topLeftCoord.longitude + (bottomRightCoord.longitude - topLeftCoord.longitude) * 0.5;
region.span.latitudeDelta = fabs(topLeftCoord.latitude - bottomRightCoord.latitude) * 1.1; // Add a little extra space on the sides
region.span.longitudeDelta = fabs(bottomRightCoord.longitude - topLeftCoord.longitude) * 1.1; // Add a little extra space on the sides
region = [aMapView regionThatFits:region];
[self.mapView setRegion:region animated:YES];
mapZoom=YES;
}
//- (void)mapView:(MKMapView *)mv didAddAnnotationViews:(NSArray *)views
//{
// MKMapRect zoomRect = MKMapRectNull;
// for (id <MKAnnotation> annotation in mv.annotations)
// {
// MKMapPoint annotationPoint = MKMapPointForCoordinate(annotation.coordinate);
// MKMapRect pointRect = MKMapRectMake(annotationPoint.x, annotationPoint.y, 0.1, 0.1);
// zoomRect = MKMapRectUnion(zoomRect, pointRect);
// }
// [mv setVisibleMapRect:zoomRect animated:YES];
//}
- (void)moveMapToLocation:(CLLocation*)tmpLocation {
CLLocationDistance visibleDistance = 1000; // 1 kilometers
MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(tmpLocation.coordinate, visibleDistance, visibleDistance);
MKCoordinateRegion adjustedRegion = [self.mapView regionThatFits:viewRegion];
[self.mapView setRegion:adjustedRegion animated:YES];
}

Answer 2

var arrayPolyline = [GMSPolyline]()
var selectedRought:String!
func LoadMapRoute1()
{
let strUrl:String = "https://maps.googleapis.com/maps/api/directions/json?sensor=false&mode=driving&alternatives=true&origin=\(self.source.latitude),\(self.source.longitude)&destination=\(self.destination.latitude),\(self.destination.longitude)"
let escapedString = strUrl.replacingOccurrences(of: " ", with: "")
let url = URL(string: escapedString)
URLSession.shared.dataTask(with: url!, completionHandler:
{
(data, response, error) in
if(error != nil)
{
print("error")
}
else
{
do{
let json = try JSONSerialization.jsonObject(with: data!, options:.allowFragments) as! [String : AnyObject]
let arrRouts = json["routes"] as! NSArray
for polyline in self.arrayPolyline
{
polyline.map = nil;
}
self.arrayPolyline.removeAll()
let pathForRought:GMSMutablePath = GMSMutablePath()
if (arrRouts.count == 0)
{
let distance:CLLocationDistance = CLLocation.init(latitude: self.source.latitude, longitude: self.source.longitude).distance(from: CLLocation.init(latitude: self.destination.latitude, longitude: self.destination.longitude))
pathForRought.add(self.source)
pathForRought.add(self.destination)
let polyline = GMSPolyline.init(path: pathForRought)
polyline.strokeWidth = 5
polyline.strokeColor = UIColor.blue
polyline.isTappable = true
self.arrayPolyline.append(polyline)
if (distance > 8000000)
{
polyline.geodesic = false
}
else
{
polyline.geodesic = true
}
polyline.map = self.mapView;
}
else
{
for (index, element) in arrRouts.enumerated()
{
let dicData:NSDictionary = element as! NSDictionary
let routeOverviewPolyline = dicData["overview_polyline"] as! NSDictionary
let path = GMSPath.init(fromEncodedPath: routeOverviewPolyline["points"] as! String)
let polyline = GMSPolyline.init(path: path)
polyline.isTappable = true
self.arrayPolyline.append(polyline)
polyline.strokeWidth = 5
if index == 0
{
polyline.strokeColor = UIColor.blue;
}
else
{
polyline.strokeColor = UIColor.darkGray;
}
polyline.geodesic = true;
}
for po in self.arrayPolyline.reversed()
{
po.map = self.mapView;
}
}
DispatchQueue.main.asyncAfter(deadline: .now() + 0.5)
{
let bounds:GMSCoordinateBounds = GMSCoordinateBounds.init(path: GMSPath.init(fromEncodedPath: self.selectedRought)!)
self.mapView.animate(with: GMSCameraUpdate.fit(bounds))
}
}
catch let error as NSError
{
print("error:\(error)")
}
}
}).resume()
}