我试图让我的 MKPolyline 显示，我想我几乎所有的东西都是正确的，但我一定错过了一些东西。没有错误代码，否则地图显示正常，我可以很好地删除注释针。
.h
@interface SatFinderViewController: UIViewController
<MKMapViewDelegate>
{
IBOutlet MKOverlayView *mapView;
IBOutlet MKMapView *map;
MKMapView *_mapView;
MKPolyline *_routeLine;
MKPolylineView *_routeLineView;
}
@property (nonatomic, retain) IBOutlet MKMapView *map;
@property (nonatomic, retain) MKAnnotationView *mapAView;
@property (nonatomic, retain) MKOverlayView *mapView;
@property (nonatomic, retain) MKPolyline *routeLine;
@property (nonatomic, retain) MKPolylineView *routeLineView;
-(void)calculate;
-(void)loadRoute;
@end
他们
-(void)calculate
{ ...
[map removeOverlay:self.routeLine];
self.routeLine = nil;
[self loadRoute];
[map addOverlay:routeLine];
[map setNeedsDisplay];
}
-(void) loadRoute
{
SatFinderAppDelegate *appdel = (SatFinderAppDelegate *)[[UIApplication sharedApplication]delegate];
float s = [appdel.location floatValue];
CLLocationCoordinate2D *locations = malloc(sizeof(CLLocationCoordinate2D) * 2);
CLLocationCoordinate2D satcoord = CLLocationCoordinate2DMake(0, s);
CLLocationCoordinate2D dishcoord = CLLocationCoordinate2DMake(pinlat, pinlon);
locations[0] = satcoord;
locations[1] = dishcoord;
NSLog(@"satcoord %f,%f", locations[0].latitude, locations[0].longitude);
NSLog(@"dishcord %f,%f", locations[1].latitude, locations[1].longitude);
// Create the polyline based on the array of points.
routeLine = [MKPolyline polylineWithCoordinates:locations count:1];
[routeLineView setNeedsDisplay];
}
- (MKOverlayView *)mapView:(MKMapView *)map viewForOverlay:(id <MKOverlay>)overlay
{
routeLineView = [[MKPolylineView alloc] initWithPolyline:self.routeLine];
routeLineView.fillColor = [UIColor blueColor];
routeLineView.strokeColor = [UIColor blueColor];
routeLineView.lineWidth = 5;
return routeLineView;
}