Drawing a route on Apple map (iOS 6+) - iphone

Question

I was looking for many code samples of how to draw a polyline on MKMapView like the second answer (from above) in this link. However, will that solution work on iOS 6 Apple maps? If not, can you provide a link to a sample code that draws the route on Apple maps?

Answer 1

Yes, it'll work.
Google maps and apple maps are different a little bit, could be some little inaccuracies.
All the API's are almost same.
P.S. I use google routes in my app since iOS5 and haven't got any problems when updated app for iOS6.

Answer 2

-(void)load_mapView{
Place* home = [[[Place alloc] init] autorelease];
home.name = strAdd;
CLLocationCoordinate2D loc=[self geoCodeUsingAddress:strAdd Status:1];
home.latitude =loc.latitude;
home.longitude =loc.longitude;
Place* office = [[[Place alloc] init] autorelease];
office.name = endAdd;
CLLocationCoordinate2D loc2=[self geoCodeUsingAddress:endAdd Status:2];;
office.latitude = loc2.latitude;
office.longitude = loc2.longitude;
//*******
routeView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, mapView.frame.size.width, mapView.frame.size.height)];
routeView.userInteractionEnabled = NO;
[mapView addSubview:routeView];
lineColor = [UIColor colorWithWhite:0.2 alpha:0.5];
[self showRouteFrom:home to:office];
[activityIndicator stopAnimating];
}
- (CLLocationCoordinate2D) geoCodeUsingAddress:(NSString *)address Status:(NSInteger )sts
{
double latitude = 0, longitude = 0;
NSString *esc_addr = [address stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSString *req = [NSString stringWithFormat:#"http://maps.google.com/maps/api/geocode/json?sensor=false&address=%#", esc_addr];
NSString *result = [NSString stringWithContentsOfURL:[NSURL URLWithString:req] encoding:NSUTF8StringEncoding error:NULL];
if (result) {
NSScanner *scanner = [NSScanner scannerWithString:result];
if ([scanner scanUpToString:#"\"lat\" :" intoString:nil] && [scanner scanString:#"\"lat\" :" intoString:nil]) {
[scanner scanDouble:&latitude];
if ([scanner scanUpToString:#"\"lng\" :" intoString:nil] && [scanner scanString:#"\"lng\" :" intoString:nil]) {
[scanner scanDouble:&longitude];
}
}
}
CLLocationCoordinate2D center;
center.latitude = latitude;
center.longitude = longitude;
return center;
}
-(NSMutableArray *)decodePolyLine: (NSMutableString *)encoded {
[encoded replaceOccurrencesOfString:#"\\\\" withString:#"\\"
options:NSLiteralSearch
range:NSMakeRange(0, [encoded length])];
NSInteger len = [encoded length];
NSInteger index = 0;
NSMutableArray *array = [[[NSMutableArray alloc] init] autorelease];
NSInteger lat=0;
NSInteger lng=0;
while (index < len) {
NSInteger b;
NSInteger shift = 0;
NSInteger result = 0;
do {
b = [encoded characterAtIndex:index++] - 63;
result |= (b & 0x1f) << shift;
shift += 5;
} while (b >= 0x20);
NSInteger dlat = ((result & 1) ? ~(result >> 1) : (result >> 1));
lat += dlat;
shift = 0;
result = 0;
do {
b = [encoded characterAtIndex:index++] - 63;
result |= (b & 0x1f) << shift;
shift += 5;
} while (b >= 0x20);
NSInteger dlng = ((result & 1) ? ~(result >> 1) : (result >> 1));
lng += dlng;
NSNumber *latitude = [[[NSNumber alloc] initWithFloat:lat * 1e-5] autorelease];
NSNumber *longitude = [[[NSNumber alloc] initWithFloat:lng * 1e-5] autorelease];
// printf("[%f,", [latitude doubleValue]);
// printf("%f]", [longitude doubleValue]);
CLLocation *loc = [[[CLLocation alloc] initWithLatitude:[latitude floatValue] longitude:[longitude floatValue]] autorelease];
[array addObject:loc];
}
return array;
}
-(NSArray*) calculateRoutesFrom:(CLLocationCoordinate2D) f to: (CLLocationCoordinate2D) t {
NSString* saddr = [NSString stringWithFormat:#"%f,%f", f.latitude, f.longitude];
NSString* daddr = [NSString stringWithFormat:#"%f,%f", t.latitude, t.longitude];
Reachability *reachability = [Reachability reachabilityForInternetConnection];
NetworkStatus internetStatus = [reachability currentReachabilityStatus];
if (internetStatus != NotReachable){
NSString* apiUrlStr = [NSString stringWithFormat:#"http://maps.google.com/maps?output=dragdir&saddr=%#&daddr=%#", saddr, daddr];
NSURL* apiUrl = [NSURL URLWithString:apiUrlStr];
// NSLog(#"api url: %#", apiUrl);
NSString *apiResponse = [NSString stringWithContentsOfURL:apiUrl];
NSString* encodedPoints = [apiResponse stringByMatching:#"points:\\\"([^\\\"]*)\\\"" capture:1L];
// NSLog(#"encodedPoints.....%#",encodedPoints);
// NSLog(#"self decodePolyLine:[encodedPoints mutableCopy].....%#",[self decodePolyLine:[encodedPoints mutableCopy]]);
NSLog(#"return %# ",[encodedPoints mutableCopy]);
return [self decodePolyLine:[encodedPoints mutableCopy]];
}else{
[activityIndicator stopAnimating];
UIAlertView *alert =[[UIAlertView alloc]initWithTitle:#"Oops!" message:#"Railway server is either busy or not responding at the moment. Try again later." delegate:nil cancelButtonTitle:#"OK" otherButtonTitles:nil, nil];
[alert show];
return 0;
}
}
-(void) centerMap {
MKCoordinateRegion region;
CLLocationDegrees maxLat = -90;
CLLocationDegrees maxLon = -180;
CLLocationDegrees minLat = 90;
CLLocationDegrees minLon = 180;
for(int idx = 0; idx < routes.count; idx++)
{
CLLocation* currentLocation = [routes objectAtIndex:idx];
if(currentLocation.coordinate.latitude > maxLat)
maxLat = currentLocation.coordinate.latitude;
if(currentLocation.coordinate.latitude < minLat)
minLat = currentLocation.coordinate.latitude;
if(currentLocation.coordinate.longitude > maxLon)
maxLon = currentLocation.coordinate.longitude;
if(currentLocation.coordinate.longitude < minLon)
minLon = currentLocation.coordinate.longitude;
}
region.center.latitude = (maxLat + minLat) / 2;
region.center.longitude = (maxLon + minLon) / 2;
region.span.latitudeDelta = maxLat - minLat;
region.span.longitudeDelta = maxLon - minLon;
[mapView setRegion:region animated:YES];
}
-(void) showRouteFrom: (Place*) f to:(Place*) t {
if(routes) {
[mapView removeAnnotations:[mapView annotations]];
[routes release];
}
PlaceMark* from = [[[PlaceMark alloc] initWithPlace:f] autorelease];
PlaceMark* to = [[[PlaceMark alloc] initWithPlace:t] autorelease];
[mapView addAnnotation:from];
[mapView addAnnotation:to];
Reachability *reachability = [Reachability reachabilityForInternetConnection];
NetworkStatus internetStatus = [reachability currentReachabilityStatus];
if (internetStatus != NotReachable){
routes = [[self calculateRoutesFrom:from.coordinate to:to.coordinate] retain];
[self drawRoute];
[self centerMap];
}else{
[activityIndicator stopAnimating];
UIAlertView *alert =[[UIAlertView alloc]initWithTitle:#"Oops!" message:#"Railway server is either busy or not responding at the moment. Try again later." delegate:nil cancelButtonTitle:#"OK" otherButtonTitles:nil, nil];
[alert show];
}
}
- (void)drawRoute
{
int numPoints = [routes count];
if (numPoints > 1)
{
CLLocationCoordinate2D* coords = malloc(numPoints * sizeof(CLLocationCoordinate2D));
for (int i = 0; i < numPoints; i++)
{
CLLocation* current = [routes objectAtIndex:i];
coords[i] = current.coordinate;
}
objPolyline = [MKPolyline polylineWithCoordinates:coords count:numPoints];
free(coords);
[mapView addOverlay:objPolyline];
[mapView setNeedsDisplay];
}
}
- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay
{
MKPolylineView *thePolylineView = [[MKPolylineView alloc] initWithPolyline:overlay];
thePolylineView.strokeColor = [UIColor colorWithRed:((float) 204.0 / 255.0f)green:((float) 7.0 / 255.0f)blue:((float) 40.0 / 255.0f)alpha:1.0f]; // <-- So important stuff here
thePolylineView.lineWidth = 5.0;
return thePolylineView;
}