Application get crashed when create long distance path on Google Map - ios

Question

I am working on an application where i want path between two locations.
I implemented some code. This is fine for short distance path but when i creating path for long distance like From Jaipur, Rajasthan, India to Jorhat, Aasam, India, my application get crashed.
This is my code
-(void)findPath{
[rectangle setMap:nil];
NSString* str = [NSMutableString stringWithFormat:#"http://maps.googleapis.com/maps/api/directions/json?origin=%#&destination=%#&sensor=true", self.FromSearch, self.toSearch];
if (_travelMode==UICGTravelModeWalking) {
str=[str stringByAppendingFormat:#"&mode=walking"];
}
NSURL *url=[[NSURL alloc]initWithString:[str stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
NSURLRequest *request = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0];
NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
NSError* error;
NSDictionary* json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
NSArray* latestRoutes = [json objectForKey:#"routes"];
NSString *points=[[[latestRoutes objectAtIndex:0] objectForKey:#"overview_polyline"] objectForKey:#"points"];
if ([latestRoutes isKindOfClass:[NSArray class]]&&latestRoutes.count==0) {
UIAlertView *alrt=[[UIAlertView alloc]initWithTitle:#"Alert" message:#"didn't find direction" delegate:nil cancelButtonTitle:#"ok" otherButtonTitles:nil, nil];
[alrt show];
return;
}
arrDistance =[[[json valueForKeyPath:#"routes.legs.steps.distance.text"] objectAtIndex:0]objectAtIndex:0];
totalDuration = [[[json valueForKeyPath:#"routes.legs.duration.text"] objectAtIndex:0]objectAtIndex:0];
totalDistance = [[[json valueForKeyPath:#"routes.legs.distance.text"] objectAtIndex:0]objectAtIndex:0];
arrDescription =[[[json valueForKeyPath:#"routes.legs.steps.html_instructions"] objectAtIndex:0] objectAtIndex:0];
dictRouteInfo=[NSDictionary dictionaryWithObjectsAndKeys:totalDistance,#"totalDistance",totalDuration,#"totalDuration",arrDistance ,#"distance",arrDescription,#"description", nil];
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];
totalLat = [[NSMutableArray alloc]init];
totalLong = [[NSMutableArray alloc]init];
//for (int i = 0; i<arrDistance.count; i++) {
totalLat = [[[json valueForKeyPath:#"routes.legs.steps.start_location.lat"] objectAtIndex:0] objectAtIndex:0];
totalLong = [[[json valueForKeyPath:#"routes.legs.steps.start_location.lng"] objectAtIndex:0] objectAtIndex:0];
[self saveInfoForPath];
// }
CLLocationCoordinate2D location;
location.latitude = srcLat;
location.longitude = srcLong;
// mapView.camera = [GMSCameraPosition cameraWithTarget:location
// zoom:10];
//GMSCoordinateBounds *bounds = [[GMSCoordinateBounds alloc]initWithPath:<#(GMSPath *)#>]
// [[GMSCoordinateBounds alloc] initWithCoordinate:vancouver coordinate:calgary];
#try {
// TODO: better parsing. Regular expression?
NSArray *temp= [self decodePolyLine:[points mutableCopy]];
GMSMutablePath *path = [GMSMutablePath path];
for(int idx = 0; idx < [temp count]; idx++)
{
CLLocation *location=[temp objectAtIndex:idx];
[path addCoordinate:location.coordinate];
}
// create the polyline based on the array of points.
rectangle = [GMSPolyline polylineWithPath:path];
rectangle.strokeWidth=5.0;
rectangle.map = mapView;
GMSCoordinateBounds *bounds = [[GMSCoordinateBounds alloc]initWithPath:path];
[mapView moveCamera:[GMSCameraUpdate fitBounds:bounds]];
}
#catch (NSException * e) {
// TODO: show error
}
}
decodePolyline() method coding
-(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] ;
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] ;
NSNumber *longitude = [[NSNumber alloc] initWithFloat:lng * 1e-5] ;
printf("[%f,", [latitude doubleValue]);
printf("%f]", [longitude doubleValue]);
CLLocation *loc = [[CLLocation alloc] initWithLatitude:[latitude floatValue] longitude:[longitude floatValue]] ;
[array addObject:loc];
}
return array;
}
What should i do. Please suggest.

Answer 1

You can try pathFromEncodedPath method in place of decodePolyLine for getting path from encodeString.
NSString *points=[[[latestRoutes objectAtIndex:0] objectForKey:#"overview_polyline"] objectForKey:#"points"];
polyline = [GMSPolyline polylineWithPath: [GMSPath pathFromEncodedPath: points]];
polyline.map = mapView;
polyline.strokeColor = [UIColor colorWithRed:0/255.0 green:4/255.0 blue:255/255.0 alpha:1.0];
polyline.strokeWidth = 4.0f;