如何使用谷歌地图或 ios mapkit 显示路线和计算距离

Question

我对 ios 地图应用程序有疑问。在某些方面我没有找到任何好的帮助。我尝试了 ios 和谷歌地图，但我无法找到两者的帮助。我被困在几个点上，所以任何人都可以帮助我这些点

1. 如何在 ios 或谷歌地图中显示路线黑白两点
2. 显示路线后，如果用户移动到该位置，如何更新路线
3. 如何在 ios 或谷歌地图中获取自行车、汽车、步行等的黑白两点的距离和时间
4. 如何仅通过地址获取坐标
5. ios 或谷歌地图有没有分步导航的选项

Answer 1

我会给你一个起点——写一条路线并获取方向

获取路线方法（google路线api）：

- (void)callAPIGetDirection:(NSString *)mode
{
// Start new request
CLLocationCoordinate2D currentLocation = [(RCAppDelegate *)[[UIApplication sharedApplication] delegate]getCurrentLocation];

// NSString *urlString = [NSString stringWithFormat:kAPIGetDirection, currentLocation.latitude, currentLocation.longitude, self.location.latitude, self.location.longitude];

//urlString = @"http://bizannouncements.com/Vega/services/app/getDirections.php?origlat=43.653310&origlong=-79.38277000000001&destlat=43.66361000000001&destlong=-79.35547000000001";
 NSString *urlString = @"";
if(![mode isEqualToString:@"transit"])
{
    urlString =[NSString stringWithFormat:@"http://maps.googleapis.com/maps/api/directions/json?origin=%f,%f&destination=%f,%f&sensor=true&mode=%@", currentLocation.latitude, currentLocation.longitude, self.location.latitude, self.location.longitude, mode];
}
else
{
    urlString =[NSString stringWithFormat:@"http://maps.googleapis.com/maps/api/directions/json?origin=%f,%f&destination=%f,%f&sensor=true&mode=%@&departure_time=%ld", currentLocation.latitude, currentLocation.longitude, self.location.latitude, self.location.longitude, mode, (long)[[NSDate date] timeIntervalSince1970] + 1800];
}

[MBProgressHUD showHUDAddedTo:self.view animated:YES];
NSURL *url = [NSURL URLWithString:[urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];

NSURLRequest *request = [NSURLRequest requestWithURL:url];
AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];

[operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
    NSDictionary *rO = [NSJSONSerialization JSONObjectWithData:responseObject options:kNilOptions error:nil];
    NSLog(@"%@", rO);
    if(![[rO objectForKey:@"status"] isEqualToString:@"INVALID_REQUEST"] && ![[rO objectForKey:@"status"] isEqualToString:@"ZERO_RESULTS"])
    {


        //OVER_QUERY_LIMIT

        if(![[rO objectForKey:@"status"] isEqualToString:@"OVER_QUERY_LIMIT"])
        {
            NSArray *routes = [rO objectForKey:@"routes"];


            NSArray *legs = [routes[0] objectForKey:@"legs"];
            //NSLog(@"legs %@", legs[0]);
            NSArray *steps = [legs[0] objectForKey:@"steps"];
            //NSLog(@"steps : %@", steps);

            Place* office = [[Place alloc] init];
            office.name = self.location.name;
            office.description = @"";
            office.latitude = [[[legs[0] objectForKey:@"end_location"] objectForKey:@"lat"] doubleValue];
            office.longitude = [[[legs[0] objectForKey:@"end_location"] objectForKey:@"lng"] doubleValue];

            //NSLog(@"office: %f", office.latitude);

            NSMutableArray *routing = [[NSMutableArray alloc] init];

            [_instructions removeAllObjects];
            int ii = 1;
            for(NSDictionary *step in steps)
            {
                [_instructions addObject:[NSString stringWithFormat:@"%i: %@", ii, [step objectForKey:@"html_instructions"]]];
                NSDictionary *suStep = [step objectForKey:@"end_location"];
                CLLocation *loc = [[CLLocation alloc] initWithLatitude:[[suStep objectForKey:@"lat"] doubleValue] longitude:[[suStep objectForKey:@"lng"] doubleValue]];
                [routing addObject:loc];
                ii++;

            }
            [_table reloadData];

            //self.mainMap.routes = routing;

            //[self.mainMap showRouteTo:office];
        }
        else
        {
            [RCCommonUtils showMessageWithTitle:@"Error" andContent:@"Directions service is down. Please try again a bit later!"];

        }

    }
    else
    {
        [RCCommonUtils showMessageWithTitle:@"Error" andContent:@"There are no directions available!"];

    }




    [MBProgressHUD hideHUDForView:self.view animated:YES];
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
    [RCCommonUtils showMessageWithTitle:@"Error" andContent:@"Network error. Please try again later!"];
    [MBProgressHUD hideAllHUDsForView:self.view animated:YES];
}];

[operation start];


}

在地图上绘制路径：

 - (id) initWithFrame:(CGRect) frame
 {
self = [super initWithFrame:frame];
if (self != nil) {
    mapView = [[MKMapView alloc] initWithFrame:CGRectMake(0, 0, frame.size.width, frame.size.height)];
    mapView.showsUserLocation = YES;
    [mapView setDelegate:self];
    [self addSubview:mapView];
    routeView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, mapView.frame.size.width, mapView.frame.size.height)];
    routeView.userInteractionEnabled = NO;
    [mapView addSubview:routeView];

    self.lineColor = [UIColor colorWithWhite:0.2 alpha:1.0];
}
return self;
 }

 -(void) centerMap {
MKCoordinateRegion region;

CLLocationDegrees maxLat = -90;
CLLocationDegrees maxLon = -180;
CLLocationDegrees minLat = 90;
CLLocationDegrees minLon = 180;
for(int idx = 0; idx < self.routes.count; idx++)
{
    CLLocation* currentLocation = [self.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) showRouteTo:(Place*)t {

if(self.routes) {
    [mapView removeAnnotations:[mapView annotations]];
}

PlaceMark* to = [[PlaceMark alloc] initWithPlace:t];
[mapView addAnnotation:to];

[self updateRouteView];
[self centerMap];
}

-(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, 4.0);

for(int i = 0; i < self.routes.count; i++) {
    CLLocation* location = [self.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 2

按地址获取坐标

- (CLLocationCoordinate2D) geoCodeUsingAddress: (NSString *) address
{
   CLLocationCoordinate2D myLocation;

   // — modified from the stackoverflow page – we use the SBJson parser instead of the string scanner –

   NSString *esc_addr = [address stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding];
   NSString *req = [NSString stringWithFormat: @"http://maps.google.com/maps/api/geocode/json?sensor=false&address=%@", esc_addr];
   NSDictionary *googleResponse = [[NSString stringWithContentsOfURL: [NSURL URLWithString: req] encoding: NSUTF8StringEncoding error: NULL] JSONValue];

   NSDictionary *resultsDict = [googleResponse valueForKey:  @"results"];   // get the results dictionary
   NSDictionary *geometryDict = [   resultsDict valueForKey: @"geometry"];   // geometry dictionary within the  results dictionary
   NSDictionary *locationDict = [  geometryDict valueForKey: @"location"];   // location dictionary within the geometry dictionary

   // nslo (@”– returning latitude & longitude from google –”);

   NSArray *latArray = [locationDict valueForKey: @"lat"]; NSString *latString = [latArray lastObject];     // (one element) array entries provided by the json parser
   NSArray *lngArray = [locationDict valueForKey: @"lng"]; NSString *lngString = [lngArray lastObject];     // (one element) array entries provided by the json parser

   myLocation.latitude = [latString doubleValue];     // the json parser uses NSArrays which don’t support “doubleValue”
   myLocation.longitude = [lngString doubleValue];

   return myLocation;
}