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POTrouble to show route between points Google Directions API. iOS 6
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  1. POTrouble to show route between points Google Directions API. iOS 6
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    copied!<p>I have a problem when displaying a route in MapView if route has waypoints. I use DIRECTIONS GOOGLE API:</p> <p><a href="https://developers.google.com/maps/documentation/directions/" rel="nofollow noreferrer">https://developers.google.com/maps/documentation/directions/</a></p> <p>The route is not drawn using the road.</p> <p>Any help? Thanks!!</p> <p><strong>The trouble images:</strong> <img src="https://i.stack.imgur.com/VB6Ak.png" alt="enter image description here"></p> <p><img src="https://i.stack.imgur.com/KsHnL.png" alt="enter image description here"></p> <p><strong>The code:</strong></p> <pre><code>reponse = [self getRouteFromGoogleApiWithPoints:arrayOfCoords andMode:@"driving" error:error]; if(reponse == nil) { UIAlertView *succes= [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"txtError", nil) message:NSLocalizedString(@"ServerError", nil) delegate: self cancelButtonTitle: @"OK" otherButtonTitles: nil]; [succes show]; } else { NSArray *routes = [reponse objectForKey:@"routes"]; NSDictionary *route = [routes objectAtIndex:0]; NSDictionary *polylineOverview = [route objectForKey:@"overview_polyline"]; NSString *polylinePoints = [polylineOverview objectForKey:@"points"]; NSArray *decodedPolyline = [self decodePolyLine:polylinePoints]; CLLocationCoordinate2D coords[[decodedPolyline count]]; int i=0; for(CLLocation* loc in decodedPolyline) { CLLocationCoordinate2D c; c.latitude = loc.coordinate.latitude; c.longitude = loc.coordinate.longitude; coords[i]=c; i++; } MKPolyline *line = [MKPolyline polylineWithCoordinates:(CLLocationCoordinate2D*)coords count:decodedPolyline.count]; [mapview addOverlay:line]; [mapview setNeedsDisplay]; } } } + (NSMutableArray *)decodePolyLine: (NSString *)encoded { NSInteger len = [encoded length]; NSInteger index = 0; NSMutableArray *array = [[NSMutableArray alloc] init]; NSInteger lat=0; NSInteger lng=0; while (index &lt; len) { NSInteger b; NSInteger shift = 0; NSInteger result = 0; do { b = [encoded characterAtIndex:index++] - 63; result |= (b &amp; 0x1f) &lt;&lt; shift; shift += 5; } while (b &gt;= 0x20); NSInteger dlat = ((result &amp; 1) ? ~(result &gt;&gt; 1) : (result &gt;&gt; 1)); lat += dlat; shift = 0; result = 0; do { b = [encoded characterAtIndex:index++] - 63; result |= (b &amp; 0x1f) &lt;&lt; shift; shift += 5; } while (b &gt;= 0x20); NSInteger dlng = ((result &amp; 1) ? ~(result &gt;&gt; 1) : (result &gt;&gt; 1)); lng += dlng; NSNumber *latitude = [[NSNumber alloc] initWithFloat:lat * 1e-5]; NSNumber *longitude = [[NSNumber alloc] initWithFloat:lng * 1e-5]; CLLocation *loc = [[CLLocation alloc] initWithLatitude:[latitude floatValue] longitude:[longitude floatValue]]; [array addObject:loc]; } return array; } +(NSDictionary*)getRouteFromGoogleApiWithPoints:(NSArray*)arrayOfPoints andMode:(NSString*)mode error:(NSError **)error { NSDictionary *result = nil; NSString *waypoints = @""; CLLocation* origin = [arrayOfPoints objectAtIndex:0]; CLLocation* destination = [arrayOfPoints objectAtIndex:arrayOfPoints.count - 1]; // Create the waypoints for(int i = 1; i &lt; arrayOfPoints.count - 2; i++) { CLLocation* current = [arrayOfPoints objectAtIndex:i]; waypoints = [waypoints stringByAppendingString:[NSString stringWithFormat:@"%f,%f%%7C",current.coordinate.latitude,current.coordinate.longitude]]; } CLLocation* lastWaypoint = [arrayOfPoints objectAtIndex:arrayOfPoints.count - 2]; waypoints = [waypoints stringByAppendingString:[NSString stringWithFormat:@"%f,%f",lastWaypoint.coordinate.latitude,lastWaypoint.coordinate.longitude]]; NSString *urlString =[NSString stringWithFormat:@"https://maps.googleapis.com/maps/api/directions/json?origin=%f,%f&amp;destination=%f,%f&amp;waypoints=%@&amp;sensor=true&amp;mode=%@",origin.coordinate.latitude,origin.coordinate.longitude,destination.coordinate.latitude,destination.coordinate.longitude,waypoints,mode]; NSDictionary* response = [self getDictionaryFromURLString:urlString withParameters:nil error:error]; if (response != nil) { if ([[response objectForKey:@"status"] isEqualToString:@"OK"]) { result = response; NSLog(@"%@",response); } else { if (error) { NSMutableDictionary* details = [NSMutableDictionary dictionary]; [details setValue:[response objectForKey:@"status"] forKey:NSLocalizedDescriptionKey]; *error = [[NSError alloc] initWithDomain:@"AppName" code:2 userInfo:details]; } } } else { if(error) { NSMutableDictionary* details = [NSMutableDictionary dictionary]; [details setValue:NSLocalizedString(@"ErrorServidor", nil) forKey:NSLocalizedDescriptionKey]; *error = [NSError errorWithDomain:@"AppName" code:1 userInfo:details]; return nil; } } return result; } </code></pre>
 

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