Obfuscate Static Library directly

Hi, 
I have an application Unity that uses the iOS static library. Then this application Unity is build in XCode.
I carefully read your documentation "Obfuscate Static Libraries", but at the time of building, the iOS static library are already "hidden in the root" of the Unity app, and XCode cannot obfuscate this. Maybe you can suggest a workaround or another tool? I'll be very grateful.