如何在iOS地图上覆盖一个圆圈-HowtooverlayacircleonaniOSmap

14  

You should be using MKCircle instead. Do something like:

您应该使用MKCircle代替。做些什么:

CLLocationDistance fenceDistance = 300;
CLLocationCoordinate2D circleMiddlePoint = CLLocationCoordinate2DMake(yourLocation.latitude, yourLocation.longitude);
MKCircle *circle = [MKCircle circleWithCenterCoordinate:circleMiddlePoint radius:fenceDistance];
[yourMapView addOverlay: circle];

And adopt the MKMapViewDelegate Method below and do something like this:

并采用下面的MKMapViewDelegate方法，完成如下操作:

- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id)overlay

{
     MKCircleView *circleView = [[[MKCircleView alloc] initWithCircle:(MKCircle *)overlay] autorelease];
     circleView.fillColor = [[UIColor redColor] colorWithAlphaComponent:0.9];
     return circleView;
 }

6  

For iOS7 :

iOS7:

Same as tdevoy in viewDidLoad :

与viewDidLoad中的tdevoy相同:

CLLocationDistance fenceDistance = 300;
CLLocationCoordinate2D circleMiddlePoint = CLLocationCoordinate2DMake(yourLocation.latitude, yourLocation.longitude);
MKCircle *circle = [MKCircle circleWithCenterCoordinate:circleMiddlePoint radius:fenceDistance];
[yourMapView addOverlay: circle];

But the delegate method (because mapView:viewForOverlay: is deprecated) :

但是委托方法(因为mapView:viewForOverlay:不赞成):

- (MKOverlayRenderer *)mapView:(MKMapView *)mapView rendererForOverlay:(id )overlay
{
    MKCircleRenderer *circleR = [[MKCircleRenderer alloc] initWithCircle:(MKCircle *)overlay];
    circleR.fillColor = [UIColor greenColor];

    return circleR;
}