It took me a while to get this done. We hope you can get your work done with the following steps:
Create a new C ++ project in Xcode
I copied the code from <mongo_driver_install>/src/mongo/client/examples/tutorial.cpp as a test
In build settings / search paths:

Add the following to your Header Search Paths :
/path/to/mongo-cxx-driver-nightly/src
and your equivalent path for formatting header files (the folder should contain the boost folder):
/usr/local/Cellar/boost/1.54.0/include
Add the following to your Library Search Paths :
/usr/local/lib (in my case holds all of the boost libraries) /path/to/mongo-cxx-driver-nightly
Link Binary Files
In the Build Phases/Link Binary with Libraries settings:

Add the following binaries:
/path/to/mongo-cxx-driver-nightly/libmongoclient.a /usr/local/lib/libboost_thread-mt.dylib /usr/local/lib/libboost_system-mt.dylib /usr/local/lib/libboost_filesystem-mt.dylib /usr/local/lib/libboost_program_options-mt.dylib
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