我正在尝试让我的 MKPolyline 显示出来，我想我几乎一切都正确，但我一定遗漏了一些东西。没有错误代码，否则 map 显示正常，我可以放下注释图钉。
.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
.m
-(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;
}
最佳答案
routeLine = [MKPolyline polylineWithCoordinates:locations count:1];
应该是“count:2”而不是“count:1”
关于objective-c - MKPolyline 不会显示，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/10860333/