Utilities for working with ctypes/objc_util/cffi in Pythonista 1.6 3.0.
cffipp is a library that provides a preprocessor for cffi.
Requires Pythonista 3, Python 3, ply (tested with version 3.8), pycparser (tested with version 2.14) and cffi version 1.6.0 (this is likely an exact requirement, cffipp does some dark magic with cffi's internals).
For anything meaningful you'll also need the iOS SDK header files. If you're on a Mac, the best way to get them is from Xcode. If you don't have it, it's free on the App Store, no registration of any kind required. Once it's installed, open your Applications folder, right-click Xcode.appand select "Show Package Contents". Go to Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/usr, zip up the include folder (right-click and select 'Compress "include"', the zip will land on your desktop) and get it into Pythonista somehow. Extract it and move the include folder into cffipp's include_private folder and name it usr_include. (Or change the include path by editing main.py, if you prefer.) The header files require no additional modification.
If you're not on a Mac, there's no "official" way to get the headers. There are probably places where you can get them though. If you don't mind a big download and some work, you can also register your Apple ID for a free Apple Developer membership under https://developer.apple.com/, download the Xcode installation dmg file, and find the files using 7-Zip from http://7-zip.org/.
To use, import cffipp, construct a cffipp.CFFIPreprocessor, tell it to cdef/cdef_include some things, then use the FFI (accessible through the preprocessor's ffi attribute) like you would normally.