The Raspberry Pi can be accessed either by wifi or ethernet depending on your needs and setup .
It is recommended to use ethernet but i find wifi acceptable with the airplay server I used .
For Airplay to work with the projector, I used the RPiPlay project.
You can find it here :
Use this command line to have all the optimisations during the compilation.
cmake --DCMAKE_CXX_FLAGS="-O3" --DCMAKE_C_FLAGS="-O3" ..
I then used this command line to rotate the display and have it ready for the iphone :
./rpiplay -n dlproj -vr rpi -r 90
which means the airplay server is named "dlproj" and its display is rotated by 90° .
Then you can just open your iphone (or iPad or even a mac) and use the display mirroring feature of it .