MKCircle不更新半徑，但它的翻譯

我要繪製一個MKCicle MKMapView。然後當用戶通過滑塊更改半徑時，我必須重新繪製它。我刪除它，然後重新創建它，重新添加到地圖中。但我沒有做我期待的事，我看到MKCircle在地圖上翻譯，保持相同的大小。MKCircle不更新半徑，但它的翻譯

這裏是我的代碼：

- (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]; 
}

的NSLog的被寫入到控制檯正確的價值觀，中心不會改變，並根據用戶輸入半徑的變化。但是，MKCircle再次翻譯了西北部。

由於提前，塞繆爾Rabini

來源

2012-01-06 Samuel Rabini

固定。我之前的

[self.mapView addOverlay:self.circle];

以這種方式添加

self.circleView = nil;

它工作正常。

塞繆爾

來源

2012-01-07 15:10:49

MKCircle不更新半徑，但它的翻譯

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