我们在使用百度地图定位成功后，一般会使用反地理编码的方式进行地址解析，获取地址信息供我们应用使用，如下方法所示：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 | // 获取地址位置后调用方法 - (void)didUpdateBMKUserLocation:(BMKUserLocation *)userLocation { /* ????code for location... ?*/ ????????// 反地址编码获取地址 ????????BMKReverseGeoCodeOption *option = [[BMKReverseGeoCodeOption alloc] init]; ????????option.reverseGeoPoint = userLocation.location.coordinate; ????????? ????????SALog(@"开始反地理编码..."); ????????? ????????if (![self.geoCode reverseGeoCode:option]){ ????????????SALog(@"反地址编码失败，使用Apple地图反地理编码"); ????????????CLLocationCoordinate2D newCoor = [[self class] GCJ02FromBD09:userLocation.location.coordinate]; ????????????CLLocation *location = [[CLLocation alloc] initWithLatitude:newCoor.latitude longitude:newCoor.longitude]; ????????????[[[CLGeocoder alloc] init] reverseGeocodeLocation:location completionHandler:^(NSArray *placemarks, NSError *error) { ????????????????CLPlacemark *placemark = [placemarks firstObject]; ????????????????SALog(@"%@ - %@", placemark.name, placemark.locality); /* ????code for address... ?*/ ????????????}]; ????????} ????????// 结束 ????} } |
但是，Apple的反地址编码使用的经纬度与百度经纬度坐标是不一致的，所以需要转换，这里给一个转换的方法：
1 2 3 4 5 6 7 8 9 10 11 | /// 百度坐标转高德坐标 + (CLLocationCoordinate2D)GCJ02FromBD09:(CLLocationCoordinate2D)coor { ????CLLocationDegrees x_pi = 3.14159265358979324 * 3000.0 / 180.0; ????CLLocationDegrees x = coor.longitude - 0.0065, y = coor.latitude - 0.006; ????CLLocationDegrees z = sqrt(x * x + y * y) - 0.00002 * sin(y * x_pi); ????CLLocationDegrees theta = atan2(y, x) - 0.000003 * cos(x * x_pi); ????CLLocationDegrees gg_lon = z * cos(theta); ????CLLocationDegrees gg_lat = z * sin(theta); ????return CLLocationCoordinate2DMake(gg_lat, gg_lon); } |
关于百度地图经纬度与苹果自带地图经纬的故事，请参考:百度地图经纬度与苹果地图经纬度之间的转换