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# MPMoviePlayerWillEnterFullscreen

Posted when a movie player is about to enter full-screen mode.

```
static let MPMoviePlayerWillEnterFullscreen: NSNotification.Name
```

## Discussion

The `userInfo` dictionary contains keys whose values describe the transition animation used to enter full-screen mode. See <doc://com.apple.documentation/documentation/MediaPlayer/fullscreen-notification-keys>.

A movie player can enter full screen mode programmatically (see the <doc://com.apple.documentation/documentation/MediaPlayer/MPMoviePlayerController/setFullscreen(_:animated:)> method) or by user interaction. The movie player whose state has changed is available as the object associated with the notification.

---

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