setOverrideTraitCollection(_:forChild:)

Declaration

func setOverrideTraitCollection(_ collection: UITraitCollection?, forChild childViewController: UIViewController)

Parameters

• collection:

  The new traits to apply to the child view controller.

• childViewController:

  The child view controller whose trait collection is to be changed.

Mentioned in

• Choosing a specific interface style for your iOS app
• Creating a custom container view controller

Discussion

Usually, traits are passed unmodified from the parent view controller to its child view controllers. When implementing a custom container view controller, you can use this method to change the traits of any embedded child view controllers to something more appropriate for your layout. Making such a change alters other view controller behaviors associated with that child. For example, modal presentations behave differently in a horizontally compact versus horizontally regular environment. You might also make such a change to force the same set of traits on the child view controller regardless of the actual trait environment.

See Also

Deprecated methods

• overrideTraitCollection(forChild:)
• attemptRotationToDeviceOrientation()
• registerForPreviewing(with:sourceView:)
• unregisterForPreviewing(withContext:)
• canPerformUnwindSegueAction(_:from:withSender:)
• didRotate(from:)
• dismissMoviePlayerViewControllerAnimated()
• forUnwindSegueAction(_:from:withSender:)
• presentMoviePlayerViewControllerAnimated(_:)
• rotatingFooterView()
• rotatingHeaderView()
• segueForUnwinding(to:from:identifier:)
• shouldAutomaticallyForwardRotationMethods()
• willAnimateRotation(to:duration:)
• willRotate(to:duration:)