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POMKPolyline not showing on MKMapView
 

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  1. POMKPolyline not showing on MKMapView
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    <p>Here's the code. Its pretty straight forward. I'm making a path for someone who is walking. So, here's the code for my <code>ViewController.m</code> file : </p> <pre><code>#import "ViewController.h" @interface ViewController () @property BOOL firstTime; @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. [self.mapView setDelegate:self]; [self.mapView setShowsUserLocation:YES]; [self.mapView setMapType:MKMapTypeHybrid]; [self setLocationManager:[[CLLocationManager alloc] init]]; [self.locationManager setDelegate:self]; [self.locationManager setDistanceFilter:kCLDistanceFilterNone]; [self.locationManager setDesiredAccuracy:kCLLocationAccuracyBest]; [self.locationManager startUpdatingLocation]; self.index = 0; self.firstTime = YES; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } - (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations { if(self.firstTime) { CLLocation *startingLocation = [locations objectAtIndex:0]; self.startingPointCooridinates = startingLocation.coordinate; self.index++; MKPointAnnotation *startingPointAnnotation = [[MKPointAnnotation alloc] init]; startingPointAnnotation.title = @"Starting Point"; startingPointAnnotation.coordinate = startingLocation.coordinate; [self.mapView addAnnotation:startingPointAnnotation]; self.firstTime = false; } [self.locations addObject:[locations objectAtIndex:0]]; CLLocationCoordinate2D coordinates[[self.locations count]]; for(int i = 0; i &lt; self.locations.count; i++) { CLLocation *currentLocation = [locations objectAtIndex:i]; coordinates[i] = currentLocation.coordinate; } MKPolyline *pathPolyline = [MKPolyline polylineWithCoordinates:coordinates count:self.locations.count]; [self.mapView addOverlay:pathPolyline]; } - (MKOverlayRenderer *)mapView:(MKMapView *)mapView rendererForOverlay:(id&lt;MKOverlay&gt;)overlay { if([overlay isKindOfClass:[MKPolyline class]]) { MKPolylineRenderer *polylineRenderer = [[MKPolylineRenderer alloc] initWithPolyline:overlay]; polylineRenderer.fillColor = [[UIColor redColor] colorWithAlphaComponent:0.2]; polylineRenderer.strokeColor = [[UIColor redColor] colorWithAlphaComponent:0.7]; polylineRenderer.lineWidth = 2.0; return polylineRenderer; } else { return nil; } } </code></pre> <p>Now, only the annotation is showing and there isn't any <code>MKPolyline</code> showing up. What am I doing wrong ? Thanks.</p>
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      1. VTUpMod
    1. CODid you check self.locations content? Are the coordinates being added to self.locations correctly? As far as I know the issue is around MKPolyline's polylineWithCoordinates method is called with wrong count parameter.
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      1. USUygar Y
    2. CODid you alloc+init self.locations? Are you running on iOS 7? By the way, you should do removeOverlays before adding because right now, code is adding a new overlay which is one segment longer than the previous ones (which are drawn under the last one). Unrelated but note that fillColor has no effect on a polyline (only need strokeColor).
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      1. USAnna
    3. COAs Anna points out, you have to set `strokeColor` not `fillColor`.
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      1. USRob
 

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