Use Moviedb API for an objective-c application

Question

I am a beginner in Xcode/objective-c. But I need to do a project where the user will do a search for a movie name and through the Moviedb database, the application will return the name and poster of the movie that the person searched for.

I have already registered there on the Moviedb site, I have the "key API" but I have no idea how to start this in objective-c. You can help me ?