in XCode (for iOS 8) using Swift language, there is no Service Reference folder to add for NAV Web Service
Understand iOS 8 (Swift) does not have Web service referen
Get a nightly build of free SoapUI. I say nightly only because some time ago it was only version that supported windows authorization, If your Nav web-service configured with another authorization type just use stable build.
SoapUI is able to consume provided web-service URL and make sample SOAP messages for you. You can even send those messages to your service to test if its work and inspect responses.
Initial WSDL\WADL
field and hit Ok.Or watch this short video.