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我正在使用谷歌地图 iOS sdk来获取方向。通过此链接帮助我在两点之间绘制路线。现在我无法向最终用户提供路线指示（例如：左转、右转）。如何解决这个问题？请帮助我。现在我正在使用以下代码

//Request the url 
-(void)getWayPoints:(CLLocationCoordinate2D )origin destinationIS:(CLLocationCoordinate2D)desti{

NSString *oLat = [NSString stringWithFormat:@"%f",origin.latitude];
NSString *oLong = [NSString stringWithFormat:@"%f",origin.longitude];

NSString *dLat = [NSString stringWithFormat:@"%f",desti.latitude];
NSString *dLong = [NSString stringWithFormat:@"%f",desti.longitude];

NSString *url = [NSString stringWithFormat:@"http://maps.googleapis.com/maps/api/directions/json?&origin=%@,%@&destination=%@,%@&sensor=false",oLat,oLong,dLat,dLong];
NSLog(@"url : %@", url);
CLLocationCoordinate2D position = CLLocationCoordinate2DMake(
                                                            origin.latitude,
                                                             origin.longitude);
GMSMarker *marker = [GMSMarker markerWithPosition:position];
marker.map = mapView_;

CLLocationCoordinate2D position1 = CLLocationCoordinate2DMake(
                                                             desti.latitude,
                                                             desti.longitude);
GMSMarker *marker1 = [GMSMarker markerWithPosition:position1];
marker1.map = mapView_;

NSURL *googleRequestURL=[NSURL URLWithString:url];
 NSLog(@"googleRequestURL : %@", googleRequestURL);

dispatch_async(kBgQueue, ^{
    NSData* data = [NSData dataWithContentsOfURL: googleRequestURL];
    [self performSelectorOnMainThread:@selector(fetchedData:) withObject:data waitUntilDone:YES];
});



//Response from URL

- (void)fetchedData:(NSData *)responseData {
//parse out the json data
NSError* error;
//  NSLog(@"responseData Data: %@", responseData);
NSDictionary* json = [NSJSONSerialization
                      JSONObjectWithData:responseData

                      options:kNilOptions
                      error:&error];
NSArray* places = [json objectForKey:@"routes"];

 NSDictionary *routes = [json objectForKey:@"routes"][0];

NSDictionary *route = [routes objectForKey:@"overview_polyline"];

NSArray *routes1 = [json objectForKey:@"routes"];
NSArray *legs = [routes1[0] objectForKey:@"legs"];
NSLog(@"legs %@", legs);
NSArray *steps = [legs[0] objectForKey:@"steps"];

 NSString *overview_route = [route objectForKey:@"points"];
 GMSPath *path = [GMSPath pathFromEncodedPath:overview_route];
 GMSPolyline *polyline = [GMSPolyline polylineWithPath:path];
 polyline.strokeColor = [UIColor redColor];
 polyline.strokeWidth = 5.f;
 polyline.map = mapView_;

}

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1 回答 1

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NSString *str=[NSString stringWithFormat:@"http://maps.googleapis.com/maps/api/directions/json?origin=%@&destination=%@&sensor=false",self.txtFrom.text,self.txtTo.text];

NSURL *url=[[NSURL alloc]initWithString:[str stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];

NSURLRequest *request = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0];

NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];


NSError* error;

NSDictionary* json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];

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

NSMutableDictionary *legs=[[[latestLoans objectAtIndex:0] objectForKey:@"legs"] objectAtIndex:0];

NSString *startLocation,*endLocation,*totalDistance,*totalDuration;

CLLocationCoordinate2D startLoc,endLoc;

startLocation = [legs  objectForKey:@"start_address"];

endLocation = [legs objectForKey:@"end_address"];

totalDistance = [[legs objectForKey:@"distance"] objectForKey:@"text"];

totalDuration = [[legs objectForKey:@"duration"] objectForKey:@"text"];

startLoc=CLLocationCoordinate2DMake([[[legs objectForKey:@"start_location"] objectForKey:@"lat"] doubleValue], [[[legs objectForKey:@"start_location"] objectForKey:@"lng"] doubleValue]);

endLoc=CLLocationCoordinate2DMake([[[legs objectForKey:@"end_location"] objectForKey:@"lat"] doubleValue], [[[legs objectForKey:@"end_location"] objectForKey:@"lng"] doubleValue]);


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

NSMutableDictionary *tempDict;

if ([steps count]!=0) {


    MKMapPoint* pointArr = malloc(sizeof(CLLocationCoordinate2D) * [steps count]+2);

    [tv setText:@""];

    for(int idx = 0; idx < [steps count]+2; idx++)
    {

        CLLocationCoordinate2D workingCoordinate;

        if (idx==0) {

            workingCoordinate=startLoc;

            MKMapPoint point = MKMapPointForCoordinate(workingCoordinate);

            pointArr[idx] = point;

            [tv setText:[NSString stringWithFormat:@"%@ %@",tv.text,@"START"]];

        }

        else if (idx==[steps count]+1){

            workingCoordinate=endLoc;

            MKMapPoint point = MKMapPointForCoordinate(workingCoordinate);

            pointArr[idx+1] = point;

            [tv setText:[NSString stringWithFormat:@"%@ %@",tv.text,@"\nEND"]];

        }

        else{

            MKPolyline *pol= [self polylineWithEncodedString:[[[steps objectAtIndex:idx-1] objectForKey:@"polyline"] objectForKey:@"points"]];

            MKMapPoint point = *(pol.points);

            pointArr[idx] = point;

            [tv setText:[NSString stringWithFormat:@"%@\n\n%@",tv.text,[self flattenHTML:[[steps objectAtIndex:idx-1] objectForKey:@"html_instructions"]]]];

        }


        tempDict = nil;
    }

    // create the polyline based on the array of points.
    [mapView removeOverlay:routeLine];

    routeLine = [MKPolyline polylineWithPoints:pointArr count:[steps count]];

    [mapView addOverlay:routeLine];

    free(pointArr);
}

有以下支持方法：

-(NSArray*) calculateRoutesFrom:(NSString *) f to: (NSString ) t { NSString apiUrlStr = [NSString stringWithFormat:@" http://maps.google.com/maps?output=dragdir&saddr=%@&daddr=%@ ", f, t];

NSURL* apiUrl = [NSURL URLWithString:apiUrlStr]; NSLog(@"api url: %@", apiUrl);
NSString *apiResponse = [NSString stringWithContentsOfURL:apiUrl encoding:NSUTF8StringEncoding error:nil]; @尝试 {

    // TODO: better parsing. Regular expression?

    NSInteger a = [apiResponse indexOf:@"points:\"" from:0];
    NSInteger b = [apiResponse indexOf:@"\",levels:\"" from:a] - 10;

    NSInteger c = [apiResponse indexOf:@"tooltipHtml:\"" from:0];
    NSInteger d = [apiResponse indexOf:@"(" from:c];
    NSInteger e = [apiResponse indexOf:@")\"" from:d] - 2;

    NSString* info = [[apiResponse substringFrom:d to:e] stringByReplacingOccurrencesOfString:@"\\x26#160;" withString:@""];
    NSLog(@"tooltip %@", info);

    NSString* encodedPoints = [apiResponse substringFrom:a to:b];

    return [self decodePolyLine:[encodedPoints mutableCopy]];

}
@catch (NSException * e) {
    // TODO: show error
}

}

于 2014-02-28T09:21:03.510 回答