Here is a guideline for you connect your iphone to Acer C202i Projector. Hope it is helpful
How to Do Plug and Play on Acer C202i Projector (iOS devices)
(1) Select the iOS on main menu of projector, and then select Plug and Play menu by pressing “OK” key.
(2) Download and install EZCast app from App Store or scan the OR code shown on screen.
(3) Connect your mobile to the projector via mobile USB charging cable, and then choose “Trust This Computer” to start your projection.
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Acer C202i Projector Quick Setup Guideline
