iOS 6 MapKit Drawing (realtime) traveled distance? - iphone

Question

i want to implement user tracking (running, walking) with GPS (Apple Maps). So when user is walking i want to draw a line on map - realtime.
How can I do that?
I saw one solution here: http://www.raywenderlich.com/21365/introduction-to-mapkit-in-ios-6-tutorial but it works only if you have already point A and B.
Thanks in advance!
Tom

Answer 1

For the first step i prepare the property like this
ViewController.h
#import <MapKit/MapKit.h>
#interface ViewController : UIViewController <CLLocationManagerDelegate, MKMapViewDelegate>
#property (nonatomic, strong) MKMapView *mapView;
#property (nonatomic, strong) MKPolyline* routeLine;
#property (nonatomic, strong) MKPolylineView* routeLineView;
#property (nonatomic, strong) NSMutableArray *trackPointArray;
#property (nonatomic, strong) CLLocationManager *locationManager;
#property (nonatomic, readwrite) MKMapRect routeRect;
#end
then i'm implement like this inside ViewController.m
- (void)locationManager:(CLLocationManager *)manager
didUpdateToLocation:(CLLocation *)newLocation
fromLocation:(CLLocation *)oldLocation
{
MKMapPoint * pointsArray = malloc(sizeof(CLLocationCoordinate2D)*2);
pointsArray[0]= MKMapPointForCoordinate(oldLocation.coordinate);
pointsArray[1]= MKMapPointForCoordinate(tempNewLocation.coordinate);
routeLine = [MKPolyline polylineWithPoints:pointsArray count:2];
free(pointsArray);
if (tempNewLocation.coordinate.latitude - oldLocation.coordinate.latitude < 1)
{
[[self mapView] addOverlay:routeLine];
}
}
For iOS6 you could try this way instead of the code above :
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
CLLocation *newLocation = [locations objectAtIndex:locations.count - 1];
CLLocation *oldLocation = nil;
if (locations.count > 1)
{
oldLocation = [locations objectAtIndex:locations.count - 2];
}
MKMapPoint * pointsArray = malloc(sizeof(CLLocationCoordinate2D)*2);
pointsArray[0]= MKMapPointForCoordinate(oldLocation.coordinate);
pointsArray[1]= MKMapPointForCoordinate(tempNewLocation.coordinate);
routeLine = [MKPolyline polylineWithPoints:pointsArray count:2];
free(pointsArray);
if (tempNewLocation.coordinate.latitude - oldLocation.coordinate.latitude < 1)
{
[[self mapView] addOverlay:routeLine];
}
}
- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay
{
MKOverlayView* overlayView = nil;
self.routeLineView = [[MKPolylineView alloc] initWithPolyline:[self routeLine]];
[[self routeLineView] setFillColor:[UIColor colorWithRed:167/255.0f green:210/255.0f blue:244/255.0f alpha:1.0]];
[[self routeLineView] setStrokeColor:[UIColor colorWithRed:106/255.0f green:151/255.0f blue:232/255.0f alpha:1.0]];
[[self routeLineView] setLineWidth:15.0];
[[self routeLineView] setLineCap:kCGLineCapRound];
overlayView = [self routeLineView];
return overlayView;
}
i hope my answer will help you, Cheers.