CODEWITHSUNDEEP
iosmkmapviewmapkitmkoverlaymkpolyline
soleil
soleil

Reputation: 13085

How to draw path with MapKit in real time (iOS7+)

I'm trying to figure out how to draw a path with MapKit given an array of location (lat/long) points. I think I need to use MKPolyline and MKOverlayRenderer. I can only seem to find information on MKRoute and MKDirections, but this is not what I need.

To start with I will have one point. Every 10 seconds or so another point will be added. How can I draw a line on a map in real time given an array of points, where the array grows over time?

This is all I have so far:

- (MKOverlayRenderer *)mapView:(MKMapView *)mapView rendererForOverlay:(id<MKOverlay>)overlay {
    if ([overlay isKindOfClass:[MKPolyline class]]) {
        MKPolyline *route = overlay;
        MKPolylineRenderer *routeRenderer = [[MKPolylineRenderer alloc] initWithPolyline:route];
        routeRenderer.strokeColor = [UIColor blueColor];
        return routeRenderer;
    }

    return nil;
}

Upvotes: 2

Views: 411

Answers (1)

incanus
incanus

Reputation: 5128

You should be able to do this with MKPolyline and MKPolylineRenderer as you have, but also look into -[MKOverlayRenderer setNeedsDisplayInMapRect:] and the associated conversion routines to translate MKMapRect to CGRect (if necessary) and you should be able to force a screen refresh upon receipt of new data.

Upvotes: 0

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