Can’t find CFBundle for UIKit

I tried to read a system constant from UIKit via CFBundle/GetDataPtrForName but I failed because I cannot get the Bundle for in Simulator. There are a few frameworks that show no identifier if I search the main bundle.
Anyway, I can get the NSBundle (and find it’s identifier: “”), although I have to search it from the AllFrameworks property, I cannot find it by its identifier too, but both bundle types are not interchangeable. Is there a similar method to GetDataPtrForName for NSBundle? Or any hints on how to find UIKit’s CFBundle on the simulator?