How to draw PolyLine in MapView ios9 - ios

Question

I have create a PolyLine in MapView. I tried to many times but did not draw. Ones a draw polyLine but that case run only simulator, I run in device and crash my app. and I already post my question here
I tried to many times and using lots of tutorials, please suggest any other tutorial.
I want to create a PolyLine in MapView using google direction URL. Starting point is my device location and end point is any lat long. so both points in centre draw a polyLine. That means create a root map starting point to end point draw a PolyLine.
Please help, Thank you

Answer 1

you can use google api for this
http://maps.googleapis.com/maps/api/directions/json?origin
in this api you have to pass lat log of your locations like this methode
-(NSArray*) calculateRoutes
{
NSString *baseUrl = [NSString stringWithFormat:#"http://maps.googleapis.com/maps/api/directions/json?origin=%f,%f&destination=%f,%f&sensor=true",currentlatitude,currentlongitude,destination lat,destination log];
NSData *data=[NSData dataWithContentsOfURL:[NSURL URLWithString:baseUrl]];
if (data) {
NSDictionary *direction_dictionary=[NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];
if (direction_dictionary) {
if ([[direction_dictionary valueForKey:#"status"] isEqualToString:#"OK"]) {
NSArray *routes_array=[direction_dictionary valueForKey:#"routes"];
if (routes_array) {
NSString *poinstEncoded_String=[[[routes_array firstObject] valueForKey:#"overview_polyline"] valueForKey:#"points"];
routes = [self decodePolyLine:[poinstEncoded_String mutableCopy]];
NSInteger numberOfSteps = routes.count;
CLLocationCoordinate2D coordinates[numberOfSteps];
for (NSInteger index = 0; index < numberOfSteps; index++)
{
CLLocation *location = [routes objectAtIndex:index];
CLLocationCoordinate2D coordinate = location.coordinate;
coordinates[index] = coordinate;
}
MKPolyline *polyLine = [MKPolyline polylineWithCoordinates:coordinates count:numberOfSteps];
dispatch_async(dispatch_get_main_queue(), ^{
[self.MapVw addOverlay:polyLine];
// add polyline here to your mapview
});
}
}
}
}
}
-(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];
CLLocation *loc = [[CLLocation alloc] initWithLatitude:[latitude floatValue] longitude:[longitude floatValue]];
[array addObject:loc];
}
return array;
}

Answer 2

After getting response (Full example http://way2ios.com/development/ios-development-2/iphone-2/draw-polygon-mkmapview-stylus/):
– (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id )overlay
{
MKPolygonView *polygonView = [[MKPolygonView alloc] initWithPolygon:overlay];
polygonView.lineWidth = 5;
polygonView.strokeColor = [UIColor redColor];
polygonView.fillColor = [UIColor colorWithRed:0 green:191 blue:255 alpha:0.5];
mapView.userInteractionEnabled = YES;
return polygonView;
}
Check these also :
https://github.com/kadirpekel/MapWithRoutes and https://github.com/versluis/MapViewLines