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POHow to track a user's location and display the path travelled using Google Maps ios SDK
 

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  1. POHow to track a user's location and display the path travelled using Google Maps ios SDK
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    <p>I'm currently building an ios app and I'm hoping to implement a function where the user's location is displayed on a Google Map view and when they move a polyline show's the path that has been travelled by the user so far. This obviously needs to happen in realtime.</p> <p>So far I've initialised a Google Maps view and can display the user's current location using the <em>observeValueForKeyPath</em> function. The view and location marker update as the user moves.</p> <p>I figured the best way to do this would be to create a GMSMutablePath object that adds the user's current location every time the map camera updates to the new location and then create a polyline from that path. The code I've used for this is below:</p> <pre><code>- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context { if ([keyPath isEqualToString:@"myLocation"] &amp;&amp; [object isKindOfClass:[GMSMapView class]]) { [self.myMapView animateToCameraPosition:[GMSCameraPosition cameraWithLatitude:self.myMapView.myLocation.coordinate.latitude longitude:self.myMapView.myLocation.coordinate.longitude zoom:18]]; [trackedPath addCoordinate:CLLocationCoordinate2DMake(self.myMapView.myLocation.coordinate.latitude, self.myMapView.myLocation.coordinate.longitude)]; GMSPolyline *testPoly = [GMSPolyline polylineWithPath:trackedPath]; testPoly.strokeWidth = 8; testPoly.strokeColor = [UIColor redColor]; testPoly.map = myMapView; } } </code></pre> <p>This doesn't produce any polyline on the map in practice so any help/advice would be much appreciated!</p>
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