How to show the path between two location in mapkit - ios

Question

I want to show two location's distance in mapkit, I have tried my process its not showing the distance between the location. tried below codes its not working, can any one help me in coding.
MKMapView * mapView = [[MKMapView alloc]initWithFrame:CGRectMake(0, 294, 320, 122)];
mapView.showsUserLocation = YES;
mapView.delegate = self;
MKDirectionsRequest *request = [[MKDirectionsRequest alloc] init];
MKPlacemark *placemark1 = [[MKPlacemark alloc] initWithCoordinate:CLLocationCoordinate2DMake(9.9176458, 78.1228237) addressDictionary:nil];
[request setSource:[[MKMapItem alloc] initWithPlacemark:placemark1]];
MKPlacemark *placemark = [[MKPlacemark alloc] initWithCoordinate:CLLocationCoordinate2DMake(13.0475604, 80.2089535) addressDictionary:nil];
request.destination = [[MKMapItem alloc] initWithPlacemark:placemark];
// [request setDestination:myMapItem];
[request setTransportType:MKDirectionsTransportTypeAutomobile]; // This can be limited to automobile and walking directions.
[request setRequestsAlternateRoutes:YES]; // Gives you several route options.
MKDirections *directions = [[MKDirections alloc] initWithRequest:request];
[directions calculateDirectionsWithCompletionHandler:^(MKDirectionsResponse *response, NSError *error) {
if (!error) {
for (MKRoute *route in [response routes]) {
[mapView addOverlay:[route polyline] level:MKOverlayLevelAboveRoads]; // Draws the route above roads, but below labels.
// You can also get turn-by-turn steps, distance, advisory notices, ETA, etc by accessing various route properties.
}
}
}];
[self.view addSubview:mapView];
- (MKOverlayRenderer *)mapView:(MKMapView *)mapView rendererForOverlay:(id < MKOverlay >)overlay
{
MKPolylineRenderer *renderer =
[[MKPolylineRenderer alloc] initWithOverlay:overlay];
renderer.strokeColor = [UIColor blueColor];
renderer.lineWidth = 5.0;
return renderer;
}
Please any help me .

Answer 1

If you check error in the -calculateDirectionsWithCompletionHandler:
[directions calculateDirectionsWithCompletionHandler:^(MKDirectionsResponse *response, NSError *error) {
if (!error) {
for (MKRoute *route in [response routes]) {
[mapView addOverlay:[route polyline] level:MKOverlayLevelAboveRoads]; // Draws the route above roads, but below labels.
// You can also get turn-by-turn steps, distance, advisory notices, ETA, etc by accessing various route properties.
}
}
else {
NSLog(#"%#", error);
}
}];
You will probably see
Error Domain=MKErrorDomain Code=5 "Directions Not Available" UserInfo=0x7fefe3bb5660 {NSLocalizedFailureReason=A route to the nearest road cannot be determined., MKErrorGEOError=-403, MKDirectionsErrorCode=6, NSLocalizedDescription=Directions Not Available}
Which means that it is not possible to calculate directions from given location.

Answer 2

Here is my code; I use CLLocationManager Delegate to compute distance between two location and MKMapView Delegate. here is my code, it may help you.
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)location{
float distance = 0.0f;
NSMutableArray *locationArray = [[NSMutableArray alloc] init];
for (CLLocation *newLocation in location) {
[locationArray addObject:newLocation];
}
for (int i = 0 ; i < locationArray.count; i++) {
CLLocation *newLocation = [locationArray objectAtIndex:i];
distance += [newLocation distanceFromLocation:[locationArray objectAtIndex:i+1]];
}
NSLog(#"%f",distance);
CLLocationCoordinate2D cordinates [locationsArray.count];
MKPolyline *userLocationsPolyLine = [MKPolyline polylineWithCoordinates:cordinates count:locationsArray.count];
[userMapView setDelegate:self];
[userMapView addOverlay:userLocationsPolyLine];
}
- (MKOverlayRenderer *)mapView:(MKMapView *)mapView rendererForOverlay:(id<MKOverlay>)overlay{
if ([overlay isKindOfClass:[MKPolyline class]]){
MKPolylineRenderer *renderer = [[MKPolylineRenderer alloc] initWithPolyline:overlay];
renderer.strokeColor = [[UIColor blueColor] colorWithAlphaComponent:0.7];
renderer.lineWidth = 3;
return renderer;
}
return nil;
}