Begins calculating the requested route information asynchronously.
- iOS 7.0+
- macOS 10.9+
- tvOS 9.2+
The block to execute when the directions are ready or when an error occurs. This parameter must not be
This method initiates the request for directions and calls your completion handler block with the results. Your completion handler is executed on your app’s main thread. The implementation of your handler should check for errors and then incorporate the response data as appropriate.
If you call this method while a previous request is in process, this method calls your completion handler with an error. You can determine if a request is in process by checking the value of the
is property. You can also cancel a request as needed.