Why is the linker presenting an error about MPMoviePlayerController when building my application?

Question

When I build, I'm receiving this error during the linking stage:

      ".objc_class_name_MPMoviePlayerController", referenced from:
          literal-pointer@__OBJC@__cls_refs@MPMoviePlayerController in MovieDemoViewController.o
      "_MPMoviePlayerPlaybackDidFinishNotification", referenced from:
          _MPMoviePlayerPlaybackDidFinishNotification$non_lazy_ptr in MovieDemoViewController.o
    ld: symbol(s) not found
    collect2: ld returned 1 exit status
Build failed (2 errors)

Why is this happening?

Answer 1

#import <MediaPlayer/MediaPlayer.h>

Answer 2

You are probably forgetting to link the MediaPlayer framework. Right-click on your project, and choose the Add | Existing Frameworks... menu item. Choose the MediaPlayer framework from that list.