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PODrawing a MKCircle on a map view
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  1. PODrawing a MKCircle on a map view
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    copied!<p>I need to draw a circle to display the distance around a point that I have plotted. </p> <p>Where should I implement these two lines of code to make it work? I tried putting it in <code>viewWillAppear:</code> but the circle does not appear.</p> <pre><code>[self addCircle:_coordinate]; [self addCircleWithRadius:5.5 addCircleWithCoordinate:_coordinate]; </code></pre> <hr> <pre><code>- (void)addCircle: (CLLocationCoordinate2D)coordinate { // draw the radius circle for the marker double radius = 2000.0; MKCircle *circle = [MKCircle circleWithCenterCoordinate:coordinate radius:radius]; [circle setTitle:@"background"]; [_mapView addOverlay:circle]; MKCircle *circleLine = [MKCircle circleWithCenterCoordinate:coordinate radius:radius]; [circleLine setTitle:@"line"]; [_mapView addOverlay:circleLine]; } </code></pre> <hr> <pre><code>- (void)addCircleWithRadius:(double)radius addCircleWithCoordinate: (CLLocationCoordinate2D) coordinate { MKCircle *circle = [MKCircle circleWithCenterCoordinate:coordinate radius:radius]; [circle setTitle:@"background"]; [_mapView addOverlay:circle]; MKCircle *circleLine = [MKCircle circleWithCenterCoordinate:coordinate radius:radius]; [circleLine setTitle:@"line"]; [_mapView addOverlay:circleLine]; } </code></pre> <hr> <pre><code>- (void)sliderChanged:(UISlider*)sender { [_mapView removeOverlays:[_mapView overlays]]; double radius = (sender.value * 100); CLLocationCoordinate2D coordinate = self.coordinate; [self addCircleWithRadius:radius addCircleWithCoordinate:coordinate]; } - (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id &lt;MKOverlay&gt;)overlay{ MKCircle *circle = overlay; MKCircleView *circleView = [[[MKCircleView alloc] initWithCircle:overlay] autorelease]; if ([circle.title isEqualToString:@"background"]) { //circleView.fillColor = UIColorFromRGB(0x598DD3); circleView.alpha = 0.25; } else { //circleView.strokeColor = UIColorFromRGB(0x5C8AC7); circleView.lineWidth = 2.0; } return circleView; } </code></pre>
 

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