Questions about Libresolv.dylib and similar libraries not added to Xcode7

Xcode7, because of some mechanism, so that we add similar to Libresolv.dylib, Libz.dylib and other libraries, directly in the build phases click the plus sign to add, it seems that the corresponding library has not been found. At this point, we can manually add it directly in build settings. Add method: Find Lingking, add in other Lingker flags. The prefix lib, and suffix are removed according to their naming conventions. Dylib, add the prefix-l, or-LRESOLV, to resolve.

Questions about Libresolv.dylib and similar libraries not added to Xcode7