Can I load a premade iOS library from Unity iphone?

I’ve almost finished a library which works with game app on iphone, so i can use this pre-made library from any further games i’m going to publish. actually for some people other than me.
and this library uses http network and a little UI components.

Unfortunately, i made this project with xcode and it only works on iOS for now.
i know how dumb it is but there’s some UI issues.

now i’m looking for ways to use this library.

so far, i figured i can use “plug-in” in a way, but it only tells me i should implement native code after unity have generated an xcode project. but i’m not sure if i can still interact with my pre-made library which is in the form of .a or .so.

and I’m not sure editing from generated xcode project means writing plug-in code.

it’s not easy to find any thread on this issue.

any advice would be really grateful.

following is a reference i’ve checked.
http://unity3d.com/support/documentation/Manual/Plugins.html

You’ll have to add the .a lib to your outputted xcode project. If you write the methods to point to the c methods in your .a lib then you will be able to use it when xcode compiles it down for the device.