如何从我的当前位置绘制一条路径到我在mapView中设置的注释针？

Question

我已经创建了一个mapView（对不起，我把我的outlet命名为mapKit而不是mapView）。我获取了我的当前位置，并且我已经手动将注释引脚设置为某个位置。现在我需要的是，只要我点击注释引脚（请正好在注释引脚上，而不是calloutAccessoryButton），我需要找到一个路径，可能使用从当前位置到注释引脚的多路径。不完全像一个方向，只是一个路径，聚覆盖。请查看我的代码并帮助我。

- (void)viewDidLoad { 
    [super viewDidLoad]; 

    locationManager = [[CLLocationManager alloc] init]; 
    [locationManager requestWhenInUseAuthorization]; 
    locationManager.desiredAccuracy = kCLLocationAccuracyBest; 
    locationManager.delegate = self; 

    [locationManager startUpdatingLocation]; 

    MKPointAnnotation *myAnnotation = [[MKPointAnnotation alloc]init]; 

    CLLocationCoordinate2D pinCoordinate; 
    pinCoordinate.latitude = 51.49795; 
    pinCoordinate.longitude = -0.174056; 
    myAnnotation.coordinate = pinCoordinate; 
    myAnnotation.title = @"Matthews Pizza"; 
    myAnnotation.subtitle = @"Best Pizza in Town"; 
    [self.mapKit addAnnotation:myAnnotation]; 

// myAnnotation.coordinate = CLLocationCoordinate2DMake(51.49795, -0.174056); 

    // Do any additional setup after loading the view. 
} 
-(void)checkStatus{ 

    CLAuthorizationStatus status = [CLLocationManager authorizationStatus]; 

    if (status==kCLAuthorizationStatusNotDetermined) { 
     NSLog(@"Not Determined"); 
    } 

    if (status==kCLAuthorizationStatusDenied) { 
     NSLog(@"Denied"); 

    } 

    if (status==kCLAuthorizationStatusRestricted) { 
     NSLog(@"Restricted"); 

    } 

    if (status==kCLAuthorizationStatusAuthorizedAlways) { 
     NSLog(@"Always Allowed"); 

    } 

    if (status==kCLAuthorizationStatusAuthorizedWhenInUse) { 
     NSLog(@"NWhen In Use Allowed"); 

    } 

} 

- (void)didReceiveMemoryWarning { 
    [super didReceiveMemoryWarning]; 
    // Dispose of any resources that can be recreated. 
} 
-(void)viewWillAppear:(BOOL)animated{ 
} 
- (void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation 
{ 

    MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(userLocation.coordinate, 800, 800); 
    [self.mapKit setRegion:[self.mapKit regionThatFits:region] animated:YES]; 




} 


#pragma mark - CLLocationManagerDelegate 

- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error 
{ 
    NSLog(@"didFailWithError: %@", error); 
    UIAlertView *errorAlert = [[UIAlertView alloc] 
           initWithTitle:@"Error" message:@"Failed to Get Your Location" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil]; 
    [errorAlert show]; 
} 

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation 
{ 
    NSLog(@"didUpdateToLocation: %@", newLocation); 
    CLLocation *currentLocation = newLocation; 

    if (currentLocation != nil) { 
     NSLog(@"%@",[NSString stringWithFormat:@"%.8f", currentLocation.coordinate.longitude]); 
     NSLog(@"%@",[NSString stringWithFormat:@"%.8f", currentLocation.coordinate.latitude]); 

    } 
} 



- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation 
{ 
    // If it's the user location, just return nil. 
    if ([annotation isKindOfClass:[MKUserLocation class]]) 
     return nil; 

    // Handle any custom annotations. 
    if ([annotation isKindOfClass:[MKPointAnnotation class]]) 
    { 
     // Try to dequeue an existing pin view first. 
     MKAnnotationView *pinView = (MKAnnotationView*)[mapView dequeueReusableAnnotationViewWithIdentifier:@"CustomPinAnnotationView"]; 
     if (!pinView) 
     { 
      // If an existing pin view was not available, create one. 
      pinView = [[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"CustomPinAnnotationView"]; 

      pinView.canShowCallout = YES; 
      pinView.image = [UIImage imageNamed:@"ic_map"]; 
      pinView.calloutOffset = CGPointMake(0, 32); 
      UIButton* rightButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure]; 
      pinView.rightCalloutAccessoryView = rightButton; 
     } else { 
      pinView.annotation = annotation; 
     } 
     return pinView; 
    } 
    return nil; 
} 


-(void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control { 
    id <MKAnnotation> annotation = [view annotation]; 
    if ([annotation isKindOfClass:[MKPointAnnotation class]]) 
    { 
     NSLog(@"Clicked Pizza Shop"); 
    } 
    UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Disclosure Pressed" message:@"Click Cancel to Go Back" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"OK", nil]; 
    [alertView show]; 
} 

Answer 1

当点击注释销委派方法将调用

-(void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view 
{ 
    NSLog(@"Latitude: %f", view.annotation.coordinate.latitude); 
    NSLog(@"Longitude: %f", view.annotation.coordinate.longitude); 
    self.annotationViewCoordinate = view.annotation.coordinate; 
    [self GetDirections:view.annotation.coordinate]; 
} 

来画出路径

- (void)GetDirections:(CLLocationCoordinate2D)locationCoordinate 
{ 
    MKPlacemark *aPlcSource = [[MKPlacemark alloc] initWithCoordinate:self.mapView.userLocation.coordinate addressDictionary:[NSDictionary dictionaryWithObjectsAndKeys:@"",@"", nil]]; 

    MKPlacemark *aPlcDest = [[MKPlacemark alloc] initWithCoordinate:locationCoordinate addressDictionary:[NSDictionary dictionaryWithObjectsAndKeys:@"",@"", nil]]; 

    MKMapItem *mpItemSource = [[MKMapItem alloc] initWithPlacemark:aPlcSource]; 
    [mpItemSource setName:@"Source"]; 

    MKMapItem *mpItemDest = [[MKMapItem alloc] initWithPlacemark:aPlcDest]; 
    [mpItemDest setName:@"Dest"]; 

    MKDirectionsRequest *aDirectReq = [[MKDirectionsRequest alloc] init]; 
    [aDirectReq setSource:mpItemSource]; 
    [aDirectReq setDestination:mpItemDest]; 
    [aDirectReq setTransportType:MKDirectionsTransportTypeAutomobile]; 

    MKDirections *aDirections = [[MKDirections alloc] initWithRequest:aDirectReq]; 
    [aDirections calculateDirectionsWithCompletionHandler:^(MKDirectionsResponse *response, NSError *error) { 
     if (error) { 
      NSLog(@"Error :: %@",error); 
     } 
     else{ 

      NSArray *aArrRoutes = [response routes]; 
      NSLog(@"Routes :: %@",aArrRoutes); 

      [self.mapView removeOverlays:self.mapView.overlays]; 

      [aArrRoutes enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) { 
       MKRoute *aRoute = obj; 

       [self.mapView addOverlay:aRoute.polyline]; 

       NSLog(@"Route Name : %@",aRoute.name); 
       NSLog(@"Total Distance (in Meters) :%f",aRoute.distance); 
NSArray *aArrSteps = [aRoute steps]; 

       NSLog(@"Total Steps : %lu",(unsigned long)[aArrSteps count]); 

       [aArrSteps enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) { 
        NSLog(@"Rout Instruction : %@",[obj instructions]); 
        NSLog(@"Rout Distance : %f",[obj distance]); 
       }]; 

      }]; 
     } 
}]; 
} 

当用户位置移动 U可以调用方法

- (void)GetDirections:(CLLocationCoordinate2D)locationCoordinate 

从方法

- (void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation 
{ 
    [self GetDirections:self.annotationViewCoordinate]; 
}