谷歌地图在iphone上的绘制路线

Question

我想使用纬度和经度在地图上绘制路线。如何绘制？

这是我的代码。但它不起作用。我已经添加了点可变数组的位置。之后称为drawRoute函数来绘制该位置之间的路线。

- (void)viewDidLoad { 
    [super viewDidLoad]; 
CLLocationCoordinate2D location; 
    location.latitude = (double) 23.00000; 
    location.longitude = (double) 73.00000; 


CLLocationCoordinate2D location2; 
    location2.latitude = (double) 73.00000; 
    location2.longitude = (double) 23.00000; 

    CLLocation *locationPoint1 = [[CLLocation alloc]initWithLatitude:location.latitude longitude:location.longitude]; 
    CLLocation *locationPoint2 = [[CLLocation alloc]initWithLatitude:location2.latitude longitude:location2.longitude]; 
    [self.points addObject:locationPoint1]; 
    [self.points addObject:locationPoint2]; 
[self performSelector:@selector(drowRoute)]; 
} 


-(void)drowRoute{ 
    CGContextRef context = UIGraphicsGetCurrentContext(); 
// CGContextSetStrokeColorWithColor(context, [[UIColor blueColor]CGColor]); 
    CGContextSetLineWidth(context, 2.0); 

    for(int idx = 0; idx < self.points.count; idx++) 
    { 
     CLLocation* location = [self.points objectAtIndex:idx]; 
     CGPoint point = [mapView convertCoordinate:location.coordinate toPointToView:self.view]; 

     if(idx == 0) 
     { 
      // move to the first point 
      CGContextMoveToPoint(context, point.x, point.y); 
     } 
     else 
     { 
      CGContextAddLineToPoint(context, point.x, point.y); 
     } 
    } 
    CGContextStrokePath(context); 
} 

Answer 1

以下是使用lat，long坐标在地图上绘制路线的示例源代码。

http://developer.apple.com/library/ios/#samplecode/Breadcrumb/Introduction/Intro.html

这是我学会了如何做的很任务。

此外，要绘制线条，请在this post中找到用于注释的类。查看帖子中的源代码，这将足以帮助你，我希望。

通过在第二个链接我有使用后的类，你只需要提供的坐标（纬度，经度）和班会做休息:)

Answer 2

使用下面的代码：

-(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] autorelease]; 
    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] autorelease]; 
     NSNumber *longitude = [[[NSNumber alloc] initWithFloat:lng * 1e-5] autorelease]; 
     CLLocation *loc = [[[CLLocation alloc] initWithLatitude:[latitude floatValue] longitude:[longitude floatValue]] autorelease]; 
     [array addObject:loc]; 
    } 

    return array; 
} 
-(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]; 
    NSURL* apiUrl = [NSURL URLWithString:apiUrlStr]; 

    NSString *apiResponse = [NSString stringWithContentsOfURL:apiUrl]; 
    NSString* encodedPoints = [apiResponse stringByMatching:@"points:\\\"([^\\\"]*)\\\"" capture:1L]; 

    return [self decodePolyLine:[encodedPoints mutableCopy]]; 
} 
-(void) centerMap { 
    MKCoordinateRegion region; 

    CLLocationDegrees maxLat = -90; 
    CLLocationDegrees maxLon = -180; 
    CLLocationDegrees minLat = 90; 
    CLLocationDegrees minLon = 180; 
    for(int idx = 0; idx < routes.count; idx++) 
    { 
     CLLocation* currentLocation = [routes objectAtIndex:idx]; 
     if(currentLocation.coordinate.latitude > maxLat) 
      maxLat = currentLocation.coordinate.latitude; 
     if(currentLocation.coordinate.latitude < minLat) 
      minLat = currentLocation.coordinate.latitude; 
     if(currentLocation.coordinate.longitude > maxLon) 
      maxLon = currentLocation.coordinate.longitude; 
     if(currentLocation.coordinate.longitude < minLon) 
      minLon = currentLocation.coordinate.longitude; 
    } 
    region.center.latitude  = (maxLat + minLat)/2; 
    region.center.longitude = (maxLon + minLon)/2; 
    region.span.latitudeDelta = maxLat - minLat; 
    region.span.longitudeDelta = maxLon - minLon; 

    [mapView setRegion:region animated:YES]; 
} 
-(void) calculate_distance{ 
    float target = [location1 distanceFromLocation:location2]/1000; 
    text2=[NSString stringWithFormat:@"%fkm",target]; 
    routes = [[self calculateRoutesFrom:location1.coordinate to:location2.coordinate] retain]; 

    if([routes count]!=0){ 
     [self updateRouteView]; 
     [self centerMap]; 
     UIAlertView* alert1=[[UIAlertView alloc]initWithTitle:@"MESSAGE" message:text2 delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil]; 
     [alert1 show]; 
     [alert1 release]; 
    } 
    else{ 
     UIAlertView* alert=[[UIAlertView alloc]initWithTitle:@"MESSAGE" message:@"We could not draw direction between your desired locations" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil]; 
     [alert show]; 
     [alert release]; 
    } 

    location1=0; 
    location2=0; 
} 
-(void) updateRouteView { 
    CGContextRef context = CGBitmapContextCreate(nil, 
                routeView.frame.size.width, 
                routeView.frame.size.height, 
                8, 
                4 * routeView.frame.size.width, 
                CGColorSpaceCreateDeviceRGB(), 
                kCGImageAlphaPremultipliedLast); 

    CGContextSetStrokeColorWithColor(context, lineColor.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 3

我使用它使用Goggle地图服务。您只需要将经度和纬度作为参数传递给URL，其余部分由Google地图进行处理。

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    locationManager = [[CLLocationManager alloc] init]; 
    locationManager.delegate = self; 
    locationManager.distanceFilter = kCLDistanceFilterNone; 
    locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters; 
    [locationManager startUpdatingLocation]; 

    NSString *url = [NSString stringWithFormat: @"http://maps.google.com/maps?saddr=%f,%f&daddr=%f,%f",c_lat,c_long,lat,lat]; 
    //saddr= we pass source address long, lat. 
    //daddr= we pass destination address long, lat. 

    //--------use this if you have current long,lat and destination's address or street name etc... 

    NSString* url = [NSString stringWithFormat: @"http://maps.google.com/maps?saddr=%f,%f&daddr=%@", 
       currentLocation.latitude, currentLocation.longitude, 
       [address stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]; 
    //------------------------------------------------------------------------------ 
    [[UIApplication sharedApplication] openURL: [NSURL URLWithString:url]]; // this line will open Google map on Maps application on device and in Safari in Simulator. 


} 

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation 
{ 

    curntloc = [[CLLocation alloc] initWithLatitude:newLocation.coordinate.latitude longitude:newLocation.coordinate.longitude]; 

NSLog(@"in func--> %f %f",curntloc.coordinate.latitude, curntloc.coordinate.longitude); 
} 

Answer 4

我用下面给出的代码绘制两个位置之间的路线：

- (void)fetchPolylineWithOrigin:(CLLocation *)origin destination:(CLLocation *)destination { 
    NSString *originString = [NSString stringWithFormat:@"%f,%f", origin.coordinate.latitude, origin.coordinate.longitude]; 
    NSString *destinationString = [NSString stringWithFormat:@"%f,%f", destination.coordinate.latitude, destination.coordinate.longitude]; 
    NSString *directionsAPI = @"https://maps.googleapis.com/maps/api/directions/json?"; 
    NSString *directionsUrlString = [NSString stringWithFormat:@"%@&origin=%@&destination=%@&mode=driving", directionsAPI, originString, destinationString]; 
    NSURL *directionsUrl = [NSURL URLWithString:directionsUrlString]; 

    NSURLSessionDataTask *fetchDirectionsTask = [[NSURLSession sharedSession] dataTaskWithURL:directionsUrl completionHandler: 
    ^(NSData *data, NSURLResponse *response, NSError *error) { 
     NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error]; 
     if(error) { 
      //Error in fetching poline 
      return; 
     } 

     NSArray *routesArray = [json objectForKey:@"routes"]; 

     if ([routesArray count] > 0) { 
      NSDictionary *routeDict = [routesArray objectAtIndex:0]; 
      NSDictionary *routeOverviewPolyline = [routeDict objectForKey:@"overview_polyline"]; 
      NSString *points = [routeOverviewPolyline objectForKey:@"points"]; 
      GMSPath *path = [GMSPath pathFromEncodedPath:points]; 
      [self drawPath:path]; 
     } 
    }]; 
    [fetchDirectionsTask resume]; 
} 


- (void)drawPath:(GMSPath *)newPath { 

    GMSPolyline *polyline = [GMSPolyline polylineWithPath:newPath]; 
    polyline.strokeColor =PathColor; 
    polyline.strokeWidth = 2.5; 
    polyline.geodesic = YES; 

    NSArray *styles = @[[GMSStrokeStyle solidColor:PathColor], 
         [GMSStrokeStyle solidColor:PathColor]]; 
    NSArray *lengths = @[@100000, @50000]; 
    polyline.spans = GMSStyleSpans(polyline.path, styles, lengths, kGMSLengthRhumb); 
    polyline.map = _mapView; 

}