iphone dylibs and frameworks are already in the device?

Question

Are dylibs and frameworks already in an iPhone, or does my app actually incorporate them?

Also, in Xcode I see dylibs with identical names. Sometimes the subsequent names are incremented, as in libz.dylib, libz.1.dylib, libz.1.1.3.dylib, and libz.1.2.3.dylib.

If I have to include libz, should I use the one with the highest rev number, assuming that that's what that is?

Answer 1

Just link to libz.

Don't link to a specific version unless it's an absolute requirement, because when the library is updated, the libz could be re-linked to the updated version, but the old specific version may be gone. For detail see this answer (for Linux, but applies to Darwin too).