Begins calculating the requested travel-time information asynchronously.
- iOS 7.0+
- macOS 10.9+
- tvOS 9.2+
The block to execute when the travel-time estimate is ready or when an error occurs. This parameter must not be
This method initiates a request for a travel-time estimate and calls your completion handler block with the results. Travel-time estimates take much less time to generate than directions, so use this method in situations where you want a time estimate only. 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
calculating property. You can also cancel a request as needed.