how to show an arrow on mapview showing the driving direction

Question

I want to show an arrow image on GMSMapView(i am using google maps sdk). Now if i am driving(arrow is showing my current location) and i have to take left turn then i have to change bearing of mapView. But i have no idea how to do this.

I am trying to change bearing in didUpdateHeading

- (void)locationManager:(CLLocationManager *)manager didUpdateHeading:(CLHeading *)newHeading{
if(newHeading.headingAccuracy>0)
{

    float heading = newHeading.magneticHeading; //in degrees
     //heading = (heading*M_PI/180);
    //NSLog(@"heading=%f", heading);
    [mapView animateToBearing:heading];
}}

headingFilter is set to 12.

I have also tried trueHeading, but magneticHeading is giving better results not accurate though.
Please help.

have you tried `[Your CLLocationManager instance].desiredAccuracy = kCLLocationAccuracyBestForNavigation` ? — Hani Ibrahim, Dec 06 '13 at 07:56
yes, locationManager.distanceFilter = kCLDistanceFilterNone; locationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation; — Virat Naithani, Dec 06 '13 at 07:59

score 5 · Answer 1 · edited Jan 26 '17 at 13:54

5

You don't actually need to convert anything to degrees. The newHeading object you get from your delegate method should be enough. The GMS-reference for the animateToBearing: requires a CLLocationDirection as a parameter. The newHeading.magneticHeading or newHeading.trueHeading provided by the delegate method is an object of this type. Also: you're converting the newHeading to a float, where as a CLLocationDirection is a double, so the GMS-function will also require a double. See reference.

edited Jan 26 '17 at 13:54

Konstantin Salavatov

4,370
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answered Dec 10 '13 at 13:55

Martijn

460
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i am not converting it to degrees. see the code i had posted. Even [mapView animateToBearing:newHeading.magneticHeading]; is not working properly – Virat Naithani Dec 11 '13 at 07:24
I'm sorry, I meant radians. Just try `if(newHeading.headingAccuracy>0) { [mapView animateToBearing:newHeading]; }` – Martijn Dec 11 '13 at 08:41
have you ever tried this ?? in animateToBearing we can pass CLLocationDirection newHeading is of type CLHeading – Virat Naithani Dec 11 '13 at 09:54
mapView.animate(toBearing: newHeading.magneticHeading) - works fine – Konstantin Salavatov Jan 26 '17 at 13:52

how to show an arrow on mapview showing the driving direction

1 Answers1