ios - MKCircle 没有更新半径但它正在翻译

Question

我必须将 MKCicle 绘制到 MKMapView 中。然后我必须在用户通过 slider 更改半径时重新绘制它。我删除它并重新创建它，将它重新添加到 map 中。但是我看到 MKCircle 在 map 上平移，并保持相同的大小，而不是像我期望的那样。

这是我的代码:

- (MKOverlayView *)mapView:(MKMapView *)map viewForOverlay:(id)overlay
{
    MKOverlayView* overlayView = nil;

    if(overlay == self.circle)
    {
        //if we have not yet created an overlay view for this overlay, create it now.
        if(nil == self.circleView)
        {
            self.circleView = [[[MKCircleView alloc] initWithCircle:self.circle] autorelease];
            self.circleView.fillColor = [UIColor blueColor];
            self.circleView.strokeColor = [UIColor blueColor];
            self.circleView.alpha = 50;
            self.circleView.lineWidth = 2;
        }

        overlayView = self.circleView;
    }

    return overlayView;
}

-(void)drawPolygonWithLocation
{
    [self.mapView removeOverlay: self.circle];

    MKCoordinateRegion region;
    region.center.latitude = self.geofenceLocation.latitude;
    region.center.longitude = self.geofenceLocation.longitude;
    region.span.latitudeDelta = 0.005;
    region.span.longitudeDelta = 0.005;

    MKCoordinateRegion adjustedRegion = [self.mapView regionThatFits: region];
    [self.mapView setRegion:adjustedRegion animated:TRUE];

    self.radius = (double)(slRadius.value);
    NSLog(@"Raggio: %f", self.radius);
    NSLog(@"Lat: %f, Lon: %f", region.center.latitude, region.center.longitude);
    self.circle = [MKCircle circleWithCenterCoordinate:self.geofenceLocation.coordinate radius: self.radius];
    NSLog(@"CIRCLE: radius %f Lat: %f, Lon: %f", self.circle.radius, self.circle.coordinate.latitude, self.circle.coordinate.longitude);

    [self.mapView addOverlay:self.circle];
}

-(IBAction)updateRadius:(id)sender
{ 
    [self drawPolygonWithLocation];
}

NSLog 正在向控制台写入正确的值，中心不会改变，半径会根据用户输入而改变。但是，MKCircle 再次翻译为向西北方向前进。

提前致谢，塞缪尔·拉比尼

Answer 1

已修复。我只是添加

self.circleView = nil;

之前

[self.mapView addOverlay:self.circle];

以这种方式它工作正常。

塞缪尔