在Google Maps for iOS上路线图不要按照街道线路进行

我正在开发一个iOS应用程序，使用Google Directions API在由Google Maps SDK提供的地图上绘制路线。 它在小距离上效果很好，虽然当我把地图摄像机放得很近的时候，我发现路线多段线经常走出街道。 当距离更长时，这是一个真正的灾难，如果我放大，它不会跟随街道曲线。我从Directions API获得的overview-polyline中的点，但它看起来像多段线不是poly我想要。 在Android上，它完美的作品。 Google可能会向Android发送与iOS不同的方向吗？ 你们有没有和我一样的问题？

编辑：

-(int) requestDirecionsAndshowOnMap:(GMSMapView *)aMapView{ NSArray* mode=[[NSArray alloc]initWithObjects:@"transit",@"bicycling",@"walking",@"driving", nil]; NSString *depart=[[NSString alloc] initWithFormat:@""]; NSString *origin=[[NSString alloc] initWithFormat:@""]; NSString *destination=[[NSString alloc] initWithFormat:@""]; if (self.setLanguage) self.setLanguage=[NSString stringWithFormat:@"language=%@",self.setLanguage]; else self.setLanguage=@"language=en"; if (searchModeOption==0) { if (self.departDate==nil) { self.departDate=[NSDate date]; } depart=[NSString stringWithFormat:@"&departure_time=%i",(int)[self.departDate timeIntervalSince1970]]; } if (self.origin) { origin=[NSString stringWithFormat:@"origin=%@",self.origin]; }else if (self.originCoordinate.latitude && self.originCoordinate.longitude){ origin=[NSString stringWithFormat:@"origin=%f,%f",self.originCoordinate.latitude,self.originCoordinate.longitude]; }else{ NSLog(@"No origin setted"); return -1; } if (self.destination) { destination=[NSString stringWithFormat:@"destination=%@",self.destination]; }else if (self.destinationCoordinate.latitude && self.destinationCoordinate.longitude){ destination=[NSString stringWithFormat:@"destination=%f,%f",self.destinationCoordinate.latitude,self.destinationCoordinate.longitude]; }else{ NSLog(@"No destination setted"); return -1; } NSString* URLforRequest=[[NSString stringWithFormat:@"http://maps.googleapis.com/maps/api/directions/json?%@&%@&sensor=false&%@&alternative=false&mode=%@%@",origin,destination,self.setLanguage,[mode objectAtIndex:searchModeOption],depart] stringByAddingPercentEscapesUsingEncoding: NSASCIIStringEncoding]; // NSLog(@"%@",URLforRequest); NSURLRequest *requests = [NSURLRequest requestWithURL:[NSURL URLWithString:URLforRequest]]; [NSURLConnection sendAsynchronousRequest:requests queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *error){ if (error==nil && data) { // NSLog(@"%@",[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]); directions = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:&error]; if (error) { NSLog(@"%@",error); } NSString* status=[directions objectForKey:@"status"]; NSLog(@"Status: %@", status); if ([status isEqualToString:@"OK"]) { [self decodeResult]; if (aMapView) [self showOnMap:aMapView]; } }else NSLog(@"%@",error); [[NSNotificationCenter defaultCenter] postNotificationName:@"Request Done" object:nil]; }]; return 0; } -(void) decodeResult{ self.destination=[[[[[directions objectForKey:@"routes"] objectAtIndex:0] objectForKey:@"legs"] objectAtIndex:0] objectForKey:@"end_address"]; self.distance=[[[[[[[directions objectForKey:@"routes"] objectAtIndex:0] objectForKey:@"legs"] objectAtIndex:0] objectForKey:@"distance"] objectForKey:@"text"] doubleValue]; self.duration=[[[[[[directions objectForKey:@"routes"] objectAtIndex:0] objectForKey:@"legs"] objectAtIndex:0] objectForKey:@"duration"] objectForKey:@"text"]; //Get Array of Instructions self.instrunctions=[[NSMutableArray alloc] init]; for (int n=0; n<[[[[[[directions objectForKey:@"routes"] objectAtIndex:0] objectForKey:@"legs"] objectAtIndex:0] objectForKey:@"steps"]count]; n++) { [self.instrunctions addObject:[[[[[[[directions objectForKey:@"routes"] objectAtIndex:0] objectForKey:@"legs"] objectAtIndex:0] objectForKey:@"steps"] objectAtIndex:n] objectForKey:@"html_instructions"]]; } //Get Overview Polyline NSString *polystring=[[[[directions objectForKey:@"routes"] objectAtIndex:0] objectForKey:@"overview_polyline"] objectForKey:@"points"]; NSMutableArray* decodedpolystring=[self decodePolyLine:polystring]; int numberOfCC=[decodedpolystring count]; GMSMutablePath *path = [GMSMutablePath path]; for (int index = 0; index < numberOfCC; index++) { CLLocation *location = [decodedpolystring objectAtIndex:index]; CLLocationCoordinate2D coordinate = location.coordinate; [path addLatitude:coordinate.latitude longitude:coordinate.longitude]; } self.overviewPolilyne= [GMSPolyline polylineWithPath:path]; //Get Coordinates of origin and destination to be displayed on a map float lat=[[[[[[[directions objectForKey:@"routes"] objectAtIndex:0] objectForKey:@"legs"]objectAtIndex:0] objectForKey:@"end_location"] objectForKey:@"lat"] floatValue]; float lng=[[[[[[[directions objectForKey:@"routes"] objectAtIndex:0] objectForKey:@"legs"]objectAtIndex:0] objectForKey:@"end_location"] objectForKey:@"lng"] floatValue]; CLLocationCoordinate2D tmp; tmp.latitude=lat; tmp.longitude=lng; self.destinationCoordinate=tmp; lat=[[[[[[[directions objectForKey:@"routes"] objectAtIndex:0] objectForKey:@"legs"]objectAtIndex:0] objectForKey:@"start_location"] objectForKey:@"lat"] floatValue]; lng=[[[[[[[directions objectForKey:@"routes"] objectAtIndex:0] objectForKey:@"legs"]objectAtIndex:0] objectForKey:@"start_location"] objectForKey:@"lng"] floatValue]; tmp.latitude=lat; tmp.longitude=lng; self.originCoordinate=tmp; } -(NSMutableArray *)decodePolyLine:(NSString *)encodedStr { NSMutableString *encoded = [[NSMutableString alloc] initWithCapacity:[encodedStr length]]; [encoded appendString:encodedStr]; [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]; CLLocation *location = [[CLLocation alloc] initWithLatitude:[latitude floatValue] longitude:[longitude floatValue]]; [array addObject:location]; } return array; } -(void)showOnMap:(GMSMapView *)aMapView{ GMSPolyline *polyline =self.overviewPolilyne; polyline.strokeColor = [UIColor blueColor]; polyline.strokeWidth = 2.f; //polyline.geodesic = YES; polyline.map = aMapView; } 

更新：我不得不处理每一步的折线，而不仅仅是概览折线。 现在它完美的工作。

这里是我现在使用的代码：

 // Get polyline GMSMutablePath *path = [GMSMutablePath path]; NSMutableArray *polyLinesArray = [[NSMutableArray alloc] init]; int zero=0; NSArray *steps = [[[[[directions objectForKey:@"routes"] objectAtIndex:zero] objectForKey:@"legs"] objectAtIndex:0] objectForKey:@"steps"]; for (int i=0; i<[[[[[[directions objectForKey:@"routes"] objectAtIndex:zero] objectForKey:@"legs"] objectAtIndex:0] objectForKey:@"steps"]count]; i++) { NSString* encodedPoints =[[[steps objectAtIndex:i]objectForKey:@"polyline"]valueForKey:@"points"]; polyLinesArray = [self decodePolyLine:encodedPoints]; NSUInteger numberOfCC=[polyLinesArray count]; for (NSUInteger index = 0; index < numberOfCC; index++) { CLLocation *location = [polyLinesArray objectAtIndex:index]; CLLocationCoordinate2D coordinate = location.coordinate; [path addLatitude:coordinate.latitude longitude:coordinate.longitude]; if (index==0) { [self.coordinates addObject:location]; } } } self.overviewPolilyne = [GMSPolyline polylineWithPath:path]; 

我之前做的基本上就是我只是在routes收到的信息，而如果你检查从Google Directions API收到的JSON文件，你会看到你收到更多的信息<legs>和<steps> 。 这是我们需要产生正确的结果和正确的折线的信息。 祝你好运！ 🙂