Question

我不需要这么多针脚，他们挤满了这个区域。我使用kml解析器的输出来绘制两点之间的路径，如何删除路径之间的额外引脚。我只需要用于开始和结束的引脚。如何从出现的KML中减少那些过多的红色引脚\。

// Locate the path to the route.kml file in the application's bundle
    // and parse it with the KMLParser.
    kml = [[KMLParser parseKMLAtPath:filePath] retain];

    // Add all of the MKOverlay objects parsed from the KML file to the map.
    NSArray *overlays = [kml overlays];
    [map addOverlays:overlays];

    // Add all of the MKAnnotation objects parsed from the KML file to the map.
    NSArray *annotations = [kml points];
    [map addAnnotations:annotations];

    // Walk the list of overlays and annotations and create a MKMapRect that
    // bounds all of them and store it into flyTo.
    MKMapRect flyTo = MKMapRectNull;
    for (id <MKOverlay> overlay in overlays) {
        if (MKMapRectIsNull(flyTo)) {
            flyTo = [overlay boundingMapRect];
        } else {
            flyTo = MKMapRectUnion(flyTo, [overlay boundingMapRect]);
        }
    }     //overlay



    for (id <MKAnnotation> annotation in annotations) {
        MKMapPoint annotationPoint = MKMapPointForCoordinate(annotation.coordinate);
        MKMapRect pointRect = MKMapRectMake(annotationPoint.x, annotationPoint.y, 0, 0);
        if (MKMapRectIsNull(flyTo)) {
            flyTo = pointRect;
        } else {
            flyTo = MKMapRectUnion(flyTo, pointRect);
        }
    }        ///annotation


    // Position the map so that all overlays and annotations are visible on screen.
    map.visibleMapRect = flyTo;


  }


  - (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay
   {
    return [kml viewForOverlay:overlay];
    }

  - (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation
   {

if ([[annotation title] isEqualToString:@"Destination"])
{
    MKPinAnnotationView *newAnnotation = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"greenpin"];
    newAnnotation.pinColor = MKPinAnnotationColorGreen;
    newAnnotation.animatesDrop = YES;
    newAnnotation.canShowCallout = YES;
    return newAnnotation;


}

else if ([[annotation title] isEqualToString:@"Current Location"])
{
    MKPinAnnotationView *newAnnotation = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"yellowpin"];
    newAnnotation.pinColor = MKPinAnnotationColorPurple;
    newAnnotation.animatesDrop = YES;
    newAnnotation.canShowCallout = YES;
    return newAnnotation;



}

else {

    return [kml viewForAnnotation:annotation];}
   }

Answer 1

通过此代码，[kml points]中的所有注释都会添加到地图上。

NSArray *annotations = [kml points];
    [map addAnnotations:annotations];

如果您只想要第一个和最后一个注释，那么只需添加

即可

NSArray *annotations = [kml points];
    [map addAnnotation:[annotations lastObject]];
    [map addAnnotation:[annotations objectAtIndex:0]];

Answer 2

查看Apple WWDC 2011视频的link，“使用MapKit以地理位置可视化信息”，其中显示了用于聚类MKAnnotation个对象的首选设计模式。

来自Google地图的KML文件中的注释过多的redpins

2 个答案: