我正在开发一个应用程序,我需要显示两个坐标之间的路线方向。我使用了 MKDirections
并传递了两个坐标作为源和目标,但是在 mapView
上它没有显示任何路线或绘制任何折线。下面是我的代码。在 MKDirections
中,它始终显示 nil
。请让我知道我做错了什么。
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.activityIndicator.hidden = YES;
self.routeDetailsButton.hidden = YES;
self.routeDetailsButton.enabled = NO;
self.mapView.delegate = self;
self.mapView.showsUserLocation = YES;
self.navigationItem.title = @"RouteMaster";
}
#pragma mark - MapKit delegate methods
- (void)mapView:(MKMapView *)aMapView didUpdateUserLocation:(MKUserLocation *)userLocation {
CLLocationCoordinate2D loc = [userLocation.location coordinate];
MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(loc, 1000.0f, 1000.0f);
[self.mapView setRegion:region animated:YES];
}
- (NSUInteger)supportedInterfaceOrientations
{
return UIInterfaceOrientationMaskPortrait;
}
- (IBAction)handleRoutePressed:(id)sender {
// We're working
CLLocationCoordinate2D sourceCoords = CLLocationCoordinate2DMake(28.6100, 77.2300);
MKPlacemark *sourcePlacemark = [[MKPlacemark alloc] initWithCoordinate:sourceCoords addressDictionary:nil];
MKMapItem *srcMapItem = [[MKMapItem alloc]initWithPlacemark:sourcePlacemark];
CLLocationCoordinate2D destinationCoords = CLLocationCoordinate2DMake(18.9750, 72.8258);
MKPlacemark *destinationPlacemark = [[MKPlacemark alloc] initWithCoordinate:destinationCoords addressDictionary:nil];
MKMapItem *distMapItem = [[MKMapItem alloc]initWithPlacemark:destinationPlacemark];
MKDirectionsRequest *request = [[MKDirectionsRequest alloc]init];
[request setSource:srcMapItem];
[request setDestination:distMapItem];
MKDirections *direction = [[MKDirections alloc]initWithRequest:request];
[direction calculateDirectionsWithCompletionHandler:^(MKDirectionsResponse *response, NSError *error) {
if (error)
NSLog(@"Error %@", error.description);
else
NSLog(@"response = %@",response);
NSArray *arrRoutes = [response routes];
[arrRoutes enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
MKRoute *rout = obj;
MKPolyline *line = [rout polyline];
[self.mapView addOverlay:line];
NSLog(@"Rout Name : %@",rout.name);
NSLog(@"Total Distance (in Meters) :%f",rout.distance);
NSArray *steps = [rout steps];
NSLog(@"Total Steps : %lu",(unsigned long)[steps count]);
[steps enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
NSLog(@"Rout Instruction : %@",[obj instructions]);
NSLog(@"Rout Distance : %f",[obj distance]);
}];
}];
}];
}
#pragma mark - Utility Methods
- (void)plotRouteOnMap:(MKRoute *)route
{
if(_routeOverlay) {
[self.mapView removeOverlay:_routeOverlay];
}
// Update the ivar
_routeOverlay = route.polyline;
// Add it to the map
[self.mapView addOverlay:_routeOverlay];
}
#pragma mark - MKMapViewDelegate methods
- (MKOverlayRenderer *)mapView:(MKMapView *)mapView rendererForOverlay:(id<MKOverlay>)overlay
{
MKPolylineRenderer *renderer = [[MKPolylineRenderer alloc] initWithPolyline:overlay];
renderer.strokeColor = [UIColor redColor];
renderer.lineWidth = 4.0;
return renderer;
}
- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id)overlay {
if ([overlay isKindOfClass:[MKPolyline class]]) {
MKPolylineView* aView = [[MKPolylineView alloc]initWithPolyline:(MKPolyline*)overlay] ;
aView.strokeColor = [[UIColor blueColor] colorWithAlphaComponent:0.5];
aView.lineWidth = 10;
return aView;
}
return nil;
}
最佳答案
如果 [_mapView setRegion:region] 区域和折线路径路径不在同一区域(两者应该需要显示在同一屏幕上),则通常会发生此错误。 就我而言,我正在搜索美国路线路径,而我所在的地区是印度。所以它不会调用 -(MKOverlayRenderer *)mapView:(MKMapView *)mapView rendererForOverlay:(id)overlay;功能。
关于ios - MKDirections 不在 iOS map 上显示路线,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/24360977/