Welcome,
OpenEars is a tool for creating iOS speech UIs which uses Pocketsphinx (and other tools from CMU Sphinx) as dependencies, but since it is not a Pocketsphinx wrapper it has no APIs in common with Pocketsphinx. Pocketsphinx can be compiled for iOS, which is what you are seeking here – check out the CMU Github repo in order to check out and work with the Pocketsphinx API in an iOS app.