我正在iPhone应用程序的地图上显示起始位置和结束位置之间的路线，我想在地图顶部显示起始位置，在底部显示结束位置，同时确保所有路线都应在地图上可见。下面是我试过的代码。
-(void) viewDidLoad {
MKPointAnnotation *myAnnotation = [[MKPointAnnotation alloc] init];
myAnnotation.coordinate = CLLocationCoordinate2DMake(42.110532,
-87.912126);
myAnnotation.title = @"Start point";
[self.mapView addAnnotation:myAnnotation];
MKPointAnnotation *destinatioAnnotation = [[MKPointAnnotation alloc]
init];
destinatioAnnotation.coordinate = CLLocationCoordinate2DMake(42.105948,
-87.870664);
destinatioAnnotation.title = @"End Point";
[self.mapView addAnnotation:destinatioAnnotation];
CLLocationCoordinate2D startCoord1 =
CLLocationCoordinate2DMake(42.110532, -87.912126);
MKCoordinateRegion adjustedRegion1 = [self.mapView
regionThatFits:MKCoordinateRegionMakeWithDistance(startCoord1, 300000,
300000)];
[self.mapView setRegion:adjustedRegion1 animated:YES];
self.mapView.showsCompass = NO;
MKDirectionsRequest *directionsRequest = [MKDirectionsRequest new];
directionsRequest.requestsAlternateRoutes = NO;
// Make the destination
CLLocationCoordinate2D sourceCoords =
CLLocationCoordinate2DMake(42.110532, -87.912126);
MKPlacemark *sourcePlacemark = [[MKPlacemark alloc]
initWithCoordinate:sourceCoords addressDictionary:nil];
MKMapItem *sourceLoc = [[MKMapItem alloc]
initWithPlacemark:sourcePlacemark];
// Set the source and destination on the request
// Make the destination
CLLocationCoordinate2D destinationCoords = CLLocationCoordinate2DMake(42.105948, -87.870664);
MKPlacemark *destinationPlacemark = [[MKPlacemark alloc] initWithCoordinate:destinationCoords addressDictionary:nil];
MKMapItem *destination = [[MKMapItem alloc] initWithPlacemark:destinationPlacemark];
// Set the source and destination on the request
[directionsRequest setSource:sourceLoc];
[directionsRequest setDestination:destination];
MKDirections *directions = [[MKDirections alloc] initWithRequest:directionsRequest];
[directions calculateDirectionsWithCompletionHandler:^(MKDirectionsResponse *
_Nullable response, NSError * _Nullable error) {
// Now handle the result
if (error) {
NSLog(@"There was an error getting your directions");
return;
}
// So there wasn't an error - let's plot those routes
_currentRoute = [response.routes firstObject];
[self plotRouteOnMap:_currentRoute];
}];
}
- (void)plotRouteOnMap:(MKRoute *)route {
if(_routeOverlay) {
[self.mapView removeOverlay:_routeOverlay];
}
// Update the ivar
_routeOverlay = route.polyline;
self.routePolyline = route.polyline;
self.mapView.tag = 1;
// Add it to the map
[self.mapView setVisibleMapRect:[route.polyline boundingMapRect] edgePadding:UIEdgeInsetsMake(50, 50, 50, 40) animated:YES];
/*[self.mapView setRegion:MKCoordinateRegionForMapRect([route.polyline
boundingMapRect])
animated:YES];*/
[self.mapView addOverlay:_routeOverlay level:MKOverlayLevelAboveRoads];
[self performSelector:@selector(changeHeading) withObject:nil
afterDelay:1.2];
}
- (MKOverlayRenderer *)mapView:(MKMapView *)mapView rendererForOverlay:(id<MKOverlay>)overlay {
NSLog(@"called");
MKPolylineRenderer *renderer = [[MKPolylineRenderer alloc] initWithPolyline:overlay];
if (mapView.tag == 1) {
renderer.strokeColor = [UIColor redColor];
}if (mapView.tag == 2) {
renderer.strokeColor = [UIColor blueColor];
}else{
renderer.strokeColor = [UIColor blueColor];
}
renderer.lineWidth = 4.0;
NSLog(@"x: %f, y:%f, widht: %f, height: %f",[overlay boundingMapRect].origin.x,[overlay
boundingMapRect].origin.y,[overlay
boundingMapRect].size.width,[overlay boundingMapRect].size.height);
return renderer;
}
-(void) changeHeading {
MKMapCamera *camera = self.mapView.camera;
CLLocationDistance altitude = camera.altitude;
NSLog(@"altitude: %f",altitude);
CLLocationDirection mapAngle = camera.heading;
NSLog(@"mapAngle: %f",mapAngle);
if (altitude < 3000 && altitude > 1000) {
// do something
}
if (self.mapView.camera.heading != 257) {
MKMapCamera *newCamera = [MKMapCamera camera];
newCamera.centerCoordinate = self.mapView.camera.centerCoordinate;
newCamera.heading = 257;
newCamera.altitude = self.mapView.camera.altitude;
[self.mapView setCamera:newCamera animated:YES];
}
/*MKMapCamera *turnCam = [MKMapCamera cameraLookingAtCenterCoordinate:CLLocationCoordinate2DMake(42.110532,
-87.912126)
fromEyeCoordinate:CLLocationCoordinate2DMake(42.105948, -87.870664)
eyeAltitude:self.mapView.camera.altitude];
self.mapView.camera = turnCam;*/
}