Don't know about iOS exactly; but owncloud is using the Ampache media/streaming player. There are a few players for Android that can connect to the Ampache installation included in owncloud, so there sure are some for iOS, just search for it in the app store of your choice. The ampache URL can be found in the "Personal" settings in the Media section.
90 % of all forum questions could be solved if posters did what
90 % of those posting answers to their questions are doing: enter their question into google and read...
-- shamelessly copied/translated from user xxMuahdibxx in computerbase.de forums