Classes/KMLViewerViewController.m

/*
     File: KMLViewerViewController.m 
 Abstract: 
 Displays an MKMapView and demonstrates how to use the included KMLParser class to place annotations and overlays from a parsed KML file on top of the MKMapView.
  
  Version: 1.3 
  
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 */
 
#import "KMLViewerViewController.h"
 
@implementation KMLViewerViewController
 
- (void)viewDidLoad
{
    [super viewDidLoad];
    
    // Locate the path to the route.kml file in the application's bundle
    // and parse it with the KMLParser.
    NSString *path = [[NSBundle mainBundle] pathForResource:@"KML_Sample" ofType:@"kml"];
    NSURL *url = [NSURL fileURLWithPath:path];
    kmlParser = [[KMLParser alloc] initWithURL:url];
    [kmlParser parseKML];
    
    // Add all of the MKOverlay objects parsed from the KML file to the map.
    NSArray *overlays = [kmlParser overlays];
    [map addOverlays:overlays];
    
    // Add all of the MKAnnotation objects parsed from the KML file to the map.
    NSArray *annotations = [kmlParser 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]);
        }
    }
    
    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);
        }
    }
    
    // Position the map so that all overlays and annotations are visible on screen.
    map.visibleMapRect = flyTo;
}
 
 
- (void)viewDidUnload
{
    [kmlParser release];
    [super viewDidUnload];
}
 
#pragma mark MKMapViewDelegate
 
- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay
{
    return [kmlParser viewForOverlay:overlay];
}
 
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation
{
    return [kmlParser viewForAnnotation:annotation];
}
 
@end