iPhone: Как нарисовать линию между двумя точками на MapKit?

Question

У меня есть широта и долгота двух точек и вы хотите провести линию между этими двумя точками с помощью Pin на MapKit.

У меня есть googled, но не нашел подходящего решения, потому что тот, который я нашел, рисовал наложение с массивом точек данных, но у меня нет никакого массива точек между этими двумя точками.

Всего двух пунктов и вы хотите провести линию между этими двумя точками.

Пожалуйста, помогите.

Answer 1

Сначала сделать ваш контроллер представления реализуют протокол MKMapViewDelegate и декларировать свойства вам потребуется:

@property (nonatomic, retain) MKMapView *mapView; //this is your map view 
@property (nonatomic, retain) MKPolyline *routeLine; //your line 
@property (nonatomic, retain) MKPolylineView *routeLineView; //overlay view 

затем в viewDidLoad (к примеру, или везде, где вы инициализации)

//initialize your map view and add it to your view hierarchy - **set its delegate to self*** 
CLLocationCoordinate2D coordinateArray[2]; 
coordinateArray[0] = CLLocationCoordinate2DMake(lat1, lon1); 
coordinateArray[1] = CLLocationCoordinate2DMake(lat2, lon2); 


self.routeLine = [MKPolyline polylineWithCoordinates:coordinateArray count:2]; 
[self.mapView setVisibleMapRect:[self.routeLine boundingMapRect]]; //If you want the route to be visible 

[self.mapView addOverlay:self.routeLine]; 

затем реализовать метод MKMapViewDelegate «ы -(MKOverlayView *)mapView:viewForOverlay:

-(MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id<MKOverlay>)overlay 
{ 
    if(overlay == self.routeLine) 
    { 
     if(nil == self.routeLineView) 
     { 
      self.routeLineView = [[[MKPolylineView alloc] initWithPolyline:self.routeLine] autorelease]; 
      self.routeLineView.fillColor = [UIColor redColor]; 
      self.routeLineView.strokeColor = [UIColor redColor]; 
      self.routeLineView.lineWidth = 5; 

     } 

     return self.routeLineView; 
    } 

    return nil; 
} 

Вы можете скорректировать код в соответствии с вашими потребностями, но это почти так же, как и для двух или более пунктов.

Answer 2

Вы можете нарисовать линии на карте с помощью MKPolyline.

эта ссылка

http://spitzkoff.com/craig/?p=136

также:

https://github.com/kishikawakatsumi/MapKit-Route-Directions

http://cloudmade.com/

Это все учебники и библиотеки с открытым исходным кодом, который вы можете легко сослаться. В настоящее время MapKit не поддерживает эту функцию ...

Answer 3

здесь вы должны рассчитать маршрут с его широтой и долготой, а затем нарисовать полилинию на MapView ........ Я делаю это в своем приложении .... Я рисую маршрут на карте с помощью всех информация ....

здесь, если вы MapKit, а также использовать RagexKitLite то его слишком просто для вас просто получить демо из RagexKitLite ....

Answer 4

Пожалуйста Смотрите этот учебник, чтобы нарисовать ломаную линию или маршрут в mkmapview

1>Draw route using mapkit

2> Из версий выше ios4.0 Вы можете использовать MKOverlayPathView See Apple Docs

Пример кода: -

создать PolyLine: -

-(void) loadRoute 
    { 
    NSString* filePath = [[NSBundle mainBundle] pathForResource:@”route” ofType:@”csv”]; 
    NSString* fileContents = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:nil]; 
    NSArray* pointStrings = [fileContents componentsSeparatedByCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]]; 

    MKMapPoint northEastPoint; 
    MKMapPoint southWestPoint; 

    MKMapPoint* pointArr = malloc(sizeof(CLLocationCoordinate2D) * pointStrings.count); 

    for(int idx = 0; idx < pointStrings.count; idx++) 
    { 
    NSString* currentPointString = [pointStrings objectAtIndex:idx]; 
    NSArray* latLonArr = [currentPointString componentsSeparatedByCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:@","]]; 

    CLLocationDegrees latitude = [[latLonArr objectAtIndex:0] doubleValue]; 
    CLLocationDegrees longitude = [[latLonArr objectAtIndex:1] doubleValue]; 

    CLLocationCoordinate2D coordinate = CLLocationCoordinate2DMake(latitude, longitude); 

    MKMapPoint point = MKMapPointForCoordinate(coordinate); 

     if (idx == 0) { 
    northEastPoint = point; 
    southWestPoint = point; 
    } 
    else 
    { 
    if (point.x > northEastPoint.x) 
    northEastPoint.x = point.x; 
    if(point.y > northEastPoint.y) 
    northEastPoint.y = point.y; 
    if (point.x < southWestPoint.x) 
    southWestPoint.x = point.x; 
    if (point.y < southWestPoint.y) 
    southWestPoint.y = point.y; 
    } 

    pointArr[idx] = point; 

    } 

     self.routeLine = [MKPolyline polylineWithPoints:pointArr count:pointStrings.count]; 

    _routeRect = MKMapRectMake(southWestPoint.x, southWestPoint.y, northEastPoint.x - southWestPoint.x, northEastPoint.y - southWestPoint.y); 

     free(pointArr); 

    } 

Дисплей PoluLine: -

[self.mapView addOverlay:self.routeLine]; 

Добавление накладку в одиночку ничего не будет оказывать на карте , Реализация MKMapViewDelegate должна вернуть оверлей для этого маршрута, который вы только что добавили, поскольку просто добавление не поможет.

- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id)overlay 
{ 
MKOverlayView* overlayView = nil; 

if(overlay == self.routeLine) 
{ 
//if we have not yet created an overlay view for this overlay, create it now. 
if(nil == self.routeLineView) 
{ 
self.routeLineView = [[[MKPolylineView alloc] initWithPolyline:self.routeLine] autorelease]; 
self.routeLineView.fillColor = [UIColor redColor]; 
self.routeLineView.strokeColor = [UIColor redColor]; 
self.routeLineView.lineWidth = 3; 
} 

overlayView = self.routeLineView; 

} 

return overlayView; 

} 

Answer 5

передать ваш адрес cordination

-(NSArray*) calculateRoutesFrom:(CLLocationCoordinate2D) f to: (CLLocationCoordinate2D) t { 
    NSString* saddr = [NSString stringWithFormat:@"%f,%f", f.latitude, f.longitude]; 
    NSString* daddr = [NSString stringWithFormat:@"%f,%f", t.latitude, t.longitude]; 

NSString* apiUrlStr = [NSString stringWithFormat:@"http://maps.google.com/maps?    output=dragdir&saddr=%@&daddr=%@", saddr, daddr]; 
// NSString* apiUrlStr = @"http://maps.google.com/maps?output=dragdir&saddr=40.769264,-73.958995&daddr=47.286522,-122.312932"; 
NSURL* apiUrl = [NSURL URLWithString:apiUrlStr]; 
NSLog(@"api url: %@", apiUrl); 
NSString *apiResponse = [NSString stringWithContentsOfURL:apiUrl encoding:NSUTF8StringEncoding error:nil]; 
NSString* encodedPoints = [apiResponse stringByMatching:@"points:\\\"([^\\\"]*)\\\"" capture:1L]; 
return [self decodePolyLine:[encodedPoints mutableCopy]]; 
} 


-(NSMutableArray *)decodePolyLine: (NSMutableString *)encoded { 
    [encoded replaceOccurrencesOfString:@"\\\\" withString:@"\\" 
           options:NSLiteralSearch 
            range:NSMakeRange(0, [encoded length])]; 
    NSInteger len = [encoded length]; 
    NSInteger index = 0; 
    NSMutableArray *array = [[NSMutableArray alloc] init]; 
    NSInteger lat=0; 
    NSInteger lng=0; 
    while (index < len) { 
     NSInteger b; 
     NSInteger shift = 0; 
     NSInteger result = 0; 
     do { 
      b = [encoded characterAtIndex:index++] - 63; 
      result |= (b & 0x1f) << shift; 
      shift += 5; 
     } while (b >= 0x20); 
     NSInteger dlat = ((result & 1) ? ~(result >> 1) : (result >> 1)); 
     lat += dlat; 
     shift = 0; 
     result = 0; 
     do { 
      b = [encoded characterAtIndex:index++] - 63; 
      result |= (b & 0x1f) << shift; 
      shift += 5; 
     } while (b >= 0x20); 
     NSInteger dlng = ((result & 1) ? ~(result >> 1) : (result >> 1)); 
     lng += dlng; 
     NSNumber *latitude = [[NSNumber alloc] initWithFloat:lat * 1e-5]; 
     NSNumber *longitude = [[NSNumber alloc] initWithFloat:lng * 1e-5]; 
     printf("[%f,", [latitude doubleValue]); 
     printf("%f]", [longitude doubleValue]); 
     CLLocation *loc = [[CLLocation alloc] initWithLatitude:[latitude floatValue] longitude:[longitude floatValue]]; 
     [array addObject:loc]; 
    } 

    return array; 
} 

-(void) updateRouteView:(UIColor *)clr { 
    CGContextRef context =CGBitmapContextCreate(nil,routeView.frame.size.width,routeView.frame.size.height,8,4 * routeView.frame.size.width,CGColorSpaceCreateDeviceRGB(), kCGImageAlphaPremultipliedLast); 

    CGContextSetStrokeColorWithColor(context, clr.CGColor); 
    CGContextSetRGBFillColor(context, 0.0, 0.0, 1.0, 1.0); 
    CGContextSetLineWidth(context, 3.0); 

    for(int i = 0; i < routes.count; i++) { 
     CLLocation* location = [routes objectAtIndex:i]; 
     CGPoint point = [mapView convertCoordinate:location.coordinate toPointToView:routeView]; 

     if(i == 0) { 
      CGContextMoveToPoint(context, point.x, routeView.frame.size.height - point.y); 
     } else { 
      CGContextAddLineToPoint(context, point.x, routeView.frame.size.height - point.y); 

     } 
    } 

    CGContextStrokePath(context); 

    CGImageRef image = CGBitmapContextCreateImage(context); 
    UIImage* img = [UIImage imageWithCGImage:image]; 

    routeView.image = img; 
    CGContextRelease(context); 

} 

Answer 6

#import <MapKit/MapKit.h> 

- (void)viewDidLoad 
{ 
     [mapview setDelegate:self]; 
     mapview.showsUserLocation = YES; 
} 

- (CLLocationCoordinate2D)coordinateWithLocation:(NSDictionary*)location 
{ 
    double latitude = [[location objectForKey:@"lat"] doubleValue]; 
    double longitude = [[location objectForKey:@"lng"] doubleValue]; 

    return CLLocationCoordinate2DMake(latitude, longitude); 
} 

- (void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation 
{ 

    MKCoordinateSpan span = MKCoordinateSpanMake(0.005, 0.005); 
    MKCoordinateRegion region = MKCoordinateRegionMake(userLocation.location.coordinate, span); 

    [mapview setRegion:region]; 

    [mapview setCenterCoordinate:userLocation.coordinate animated:YES]; 
    NSString *baseUrl = [NSString stringWithFormat:@"http://maps.googleapis.com/maps/api/directions/json?origin=%f,%f&destination=%@&sensor=true", mapview.userLocation.location.coordinate.latitude, mapview.userLocation.location.coordinate.longitude, @"24.1620661,72.394131"]; 


    //http://maps.googleapis.com/maps/api/directions/json?origin=23.030000,72.580000&destination=23.400000,72.750000&sensor=true 

    NSURL *url = [NSURL URLWithString:[baseUrl stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]; 

    NSLog(@"%@",url); 
    NSURLRequest *request = [NSURLRequest requestWithURL:url]; 

    [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) { 

    NSError *error = nil; 
    NSDictionary *result = [NSJSONSerialization JSONObjectWithData:data options:0 error:&error]; 

    NSArray *routes = [result objectForKey:@"routes"]; 
     NSLog(@"%@",routes); 

    NSDictionary *firstRoute = [routes objectAtIndex:0]; 

    NSDictionary *leg = [[firstRoute objectForKey:@"legs"] objectAtIndex:0]; 

    NSDictionary *end_location = [leg objectForKey:@"end_location"]; 

     NSLog(@"dDDDDDD>>>>>>%@",leg); 
    double latitude = [[end_location objectForKey:@"lat"] doubleValue]; 
    double longitude = [[end_location objectForKey:@"lng"] doubleValue]; 

    CLLocationCoordinate2D coordinate = CLLocationCoordinate2DMake(latitude, longitude); 

    MKPointAnnotation *point = [[MKPointAnnotation alloc] init]; 
    point.coordinate = coordinate; 
    point.title = [leg objectForKey:@"end_address"]; 
    point.subtitle = @"I'm here!!!"; 

    [self.mapview addAnnotation:point]; 

    NSArray *steps = [leg objectForKey:@"steps"]; 

    int stepIndex = 0; 

    CLLocationCoordinate2D stepCoordinates[1 + [steps count] + 1]; 

    stepCoordinates[stepIndex] = userLocation.coordinate; 

    for (NSDictionary *step in steps) { 

     NSDictionary *start_location = [step objectForKey:@"start_location"]; 
     stepCoordinates[++stepIndex] = [self coordinateWithLocation:start_location]; 

     if ([steps count] == stepIndex){ 
      NSDictionary *end_location = [step objectForKey:@"end_location"]; 
      stepCoordinates[++stepIndex] = [self coordinateWithLocation:end_location]; 
     } 
    } 

    MKPolyline *polyLine = [MKPolyline polylineWithCoordinates:stepCoordinates count:1 + stepIndex]; 
    [mapview addOverlay:polyLine]; 

    CLLocationCoordinate2D centerCoordinate = CLLocationCoordinate2DMake((userLocation.location.coordinate.latitude + coordinate.latitude)/2, (userLocation.location.coordinate.longitude + coordinate.longitude)/2); 

}]; 
} 

затем реализовать его метод MKMapViewDelegate в - (MKOverlayView *) MAPview: viewForOverlay:

- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay 
{ 
    MKPolylineView *polylineView = [[MKPolylineView alloc] initWithPolyline:overlay]; 
    polylineView.strokeColor = [UIColor colorWithRed:204/255. green:45/255. blue:70/255. alpha:1.0]; 
    polylineView.lineWidth = 1; 

    return polylineView; 
} 


- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation 
{ 
    static NSString *annotaionIdentifier=@"annotationIdentifier"; 
    MKPinAnnotationView *aView=(MKPinAnnotationView*)[mapView dequeueReusableAnnotationViewWithIdentifier:annotaionIdentifier ]; 
    if (aView==nil) { 

     aView=[[MKPinAnnotationView alloc]initWithAnnotation:annotation reuseIdentifier:annotaionIdentifier]; 
     aView.pinColor = MKPinAnnotationColorRed; 
     aView.rightCalloutAccessoryView = [UIButton buttonWithType:UIButtonTypeDetailDisclosure]; 
     //  aView.image=[UIImage imageNamed:@"arrow"]; 
     aView.animatesDrop=TRUE; 
     aView.canShowCallout = YES; 
     aView.calloutOffset = CGPointMake(-5, 5); 
    } 

    return aView; 
} 

Answer 7

First of all Add frame work 
    1 Foundation.framework 
    2 CoreGraphics.framework 
    3 CoreLocation.framework 
    4 MapKit.framework 

Затем создайте файл NSObject Как видите .... TrailsMap.h Файл

#import <Foundation/Foundation.h> 
#import <MapKit/MapKit.h> 
@interface TrailsMap : NSObject<MKAnnotation> 
{ 
    CLLocationCoordinate2D coordinate; 

    NSString *title; 
    NSString *image; 
    NSString *subtitle; 
} 

@property (nonatomic, readonly) CLLocationCoordinate2D coordinate; 
@property (nonatomic,copy) NSString *title; 
@property (nonatomic,copy) NSString *image; 
@property (nonatomic,copy) NSString *subtitle; 

- (id)initWithLocation:(CLLocationCoordinate2D)coord; 

TrailsMap.m

#import "TrailsMap.h" 

@implementation TrailsMap 
@synthesize coordinate,title,image,subtitle; 

- (id)initWithLocation:(CLLocationCoordinate2D)coord{ 

    self = [super init]; 
    if (self) { 
     coordinate = coord; 

    } 
    return self; 
} 

Создать кодирование в MainView Пожалуйста, см. .

ViewController.h

#import <UIKit/UIKit.h> 
#import <MapKit/MapKit.h> 


@interface ViewController : UIViewController<MKMapViewDelegate> 

@property (strong, nonatomic) IBOutlet MKMapView *MapView; 
@property (nonatomic, retain) MKPolyline *routeLine; 
@property (nonatomic, retain) MKPolylineView *routeLineView; 

-(void)LoadMapRoute; 
@end 

Наконец создать кодировку в файле mainview.m

ViewController.m

#import "ViewController.h" 
#import "TrailsMap.h" 

@interface ViewController() 
{ 
    NSData *alldata; 
    NSMutableDictionary *data1; 

    NSMutableArray *RouteLocation; 
    NSMutableArray *RouteName; 
} 
@end 

@implementation ViewController 
@synthesize MapView,routeLine,routeLineView; 


- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 

    RouteName = [[NSMutableArray alloc] initWithObjects:@"Ahmedabad",@"Rajkot", nil]; 
    RouteLocation = [[NSMutableArray alloc] initWithObjects:@"23.0300,72.5800",@"22.3000,70.7833", nil]; 
    [self LoadMapRoute]; 
} 

- (void)didReceiveMemoryWarning 
{ 
    [super didReceiveMemoryWarning]; 
} 


//------------------------------------- 
// ************* Map ****************** 
//------------------------------------- 

-(void)LoadMapRoute 
{ 
    MKCoordinateSpan span = MKCoordinateSpanMake(0.8, 0.8); 
    MKCoordinateRegion region; 
    region.span = span; 
    region.center= CLLocationCoordinate2DMake(23.0300,72.5800); 


    // Distance between two address 
    NSArray *coor1=[[RouteLocation objectAtIndex:0] componentsSeparatedByString:@","]; 
    CLLocation *locA = [[CLLocation alloc] initWithLatitude:[[coor1 objectAtIndex:0] doubleValue] longitude:[[coor1 objectAtIndex:1] doubleValue]]; 

    NSArray *coor2=[[RouteLocation objectAtIndex:1] componentsSeparatedByString:@","]; 
    CLLocation *locB = [[CLLocation alloc] initWithLatitude:[[coor2 objectAtIndex:0] doubleValue] longitude:[[coor2 objectAtIndex:1] doubleValue]]; 
    CLLocationDistance distance = [locA distanceFromLocation:locB]; 
    NSLog(@"Distance :%.0f Meters",distance); 


    NSString *baseUrl = [NSString stringWithFormat:@"http://maps.googleapis.com/maps/api/directions/json?origin=%@&destination=%@&sensor=true", [RouteLocation objectAtIndex:0],[RouteLocation objectAtIndex:1] ]; 

    NSURL *url = [NSURL URLWithString:[baseUrl stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]; 
    alldata = [[NSData alloc] initWithContentsOfURL:url]; 

    NSError *err; 
    data1 =[NSJSONSerialization JSONObjectWithData:alldata options:NSJSONReadingMutableContainers|NSJSONReadingMutableLeaves error:&err]; 

    if (err) 
    { 
     NSLog(@" %@",[err localizedDescription]); 
    } 

    NSArray *routes = [data1 objectForKey:@"routes"]; 
    NSDictionary *firstRoute = [routes objectAtIndex:0]; 
    NSDictionary *leg = [[firstRoute objectForKey:@"legs"] objectAtIndex:0]; 
    NSArray *steps = [leg objectForKey:@"steps"]; 

    int stepIndex = 0; 
    CLLocationCoordinate2D stepCoordinates[[steps count]+1 ]; 

    for (NSDictionary *step in steps) 
    { 

     NSDictionary *start_location = [step objectForKey:@"start_location"]; 
     double latitude = [[start_location objectForKey:@"lat"] doubleValue]; 
     double longitude = [[start_location objectForKey:@"lng"] doubleValue]; 
     stepCoordinates[stepIndex] = CLLocationCoordinate2DMake(latitude, longitude); 

     if (stepIndex==0) 
     { 
      TrailsMap *point=[[TrailsMap alloc] initWithLocation:stepCoordinates[stepIndex]]; 
      point.title =[RouteName objectAtIndex:0]; 
      point.subtitle=[NSString stringWithFormat:@"Distance :%.0f Meters",distance]; 
      [self.MapView addAnnotation:point]; 
     } 
     if (stepIndex==[steps count]-1) 
     { 
      stepIndex++; 
      NSDictionary *end_location = [step objectForKey:@"end_location"]; 
      double latitude = [[end_location objectForKey:@"lat"] doubleValue]; 
      double longitude = [[end_location objectForKey:@"lng"] doubleValue]; 
      stepCoordinates[stepIndex] = CLLocationCoordinate2DMake(latitude, longitude); 

      TrailsMap *point=[[TrailsMap alloc] initWithLocation:stepCoordinates[stepIndex]]; 
      point.title = [RouteName objectAtIndex:1]; 
      point.subtitle=[NSString stringWithFormat:@"Distance :%.0f Meters",distance]; 

      [self.MapView addAnnotation:point]; 
     } 
     stepIndex++; 
    } 

    MKPolyline *polyLine = [MKPolyline polylineWithCoordinates:stepCoordinates count: stepIndex]; 
    [MapView addOverlay:polyLine]; 
    [MapView setRegion:region animated:YES]; 
} 

- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay 
{ 
    MKPolylineView *polylineView = [[MKPolylineView alloc] initWithPolyline:overlay]; 
    polylineView.strokeColor = [UIColor colorWithRed:204/255. green:45/255. blue:70/255. alpha:1.0]; 
    polylineView.lineWidth = 5; 

    return polylineView; 
} 

Если Вы хотите установить несколько булавку в карту, то просто добавьте этот код. Annotaion - это Objectfile.

-(void)LoadMultiplePin 
{ 
    RouteName = [[NSMutableArray alloc] initWithObjects:@"Ahmedabad",@"Rajkot",@"Limdi", nil]; 
    RouteLocation = [[NSMutableArray alloc] initWithObjects:@"23.0300,72.5800",@"22.3000,70.7833",@"22.5728,71.8114", nil]; 

    MKCoordinateSpan span = MKCoordinateSpanMake(2.9, 2.9); 
    MKCoordinateRegion region; 

    region.span = span; 
    region.center= CLLocationCoordinate2DMake(22.5728,71.8114); 

    int cnt=RouteLocation.count; 

    for (int p=0 ; p<cnt ; p++) 
    { 
     NSArray *coor=[[RouteLocation objectAtIndex:p] componentsSeparatedByString:@","]; 

     CLLocationCoordinate2D location=CLLocationCoordinate2DMake([[coor objectAtIndex:0] doubleValue],[[coor objectAtIndex:1] doubleValue]); 

     Annotaion *point=[[Annotaion alloc] initWithLocation:location]; 
     point.title =[RouteName objectAtIndex:p]; 
     [Map addAnnotation:point]; 
    } 
    [Map setRegion:region animated:YES]; 

} 

Используя этот код Вы можете легко поковки два штыря и рисовать линии между этим два Pin Наслаждайтесь Днем Coding ... :)

Answer 8

Я взял большой ответ от @graver и сделал это для Swift 3:

// Called from viewDidLoad 
func setupMap() { 
    mapView.delegate = self 
    // BusStop implements the MKAnnotation protocol, I have an array of them 
    let routeCoordinates = busStops.map({ $0.coordinate }) 
    let routeLine = MKPolyline(coordinates: routeCoordinates, count: routeCoordinates.count) 
    mapView.setVisibleMapRect(routeLine.boundingMapRect, animated: false) 
    mapView.add(routeLine) 
} 

// MARK: MKMapViewDelegate 

func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer { 
    if let polyline = overlay as? MKPolyline { 
     let polylineRenderer = MKPolylineRenderer(overlay: polyline) 
     polylineRenderer.strokeColor = .blue 
     polylineRenderer.lineWidth = 3 
     return polylineRenderer 
    } 
    return MKOverlayRenderer(overlay: overlay) 
}