All Known Implementing Classes:

ABNewPersonViewController, ABPeoplePickerNavigationController, ABPersonViewController, ABUnknownPersonViewController, ARCoachingOverlayView, ARSCNView, ARSKView, ASAccountAuthenticationModificationViewController, ASAuthorizationAppleIDButton, ASCredentialProviderViewController, AUGenericViewController, AUViewController, AVPictureInPictureVideoCallViewController, AVPlayerViewController, AVRoutePickerView, BCChatButton, CABTMIDICentralViewController, CABTMIDILocalPeripheralViewController, CAInterAppAudioSwitcherView, CAInterAppAudioTransportView, CLLocationButton, CNContactPickerViewController, CNContactViewController, CPWindow, EKCalendarChooser, EKEventEditViewController, EKEventViewController, FPUIActionExtensionViewController, GCEventViewController, GKAchievementViewController, GKFriendRequestComposeViewController, GKGameCenterViewController, GKLeaderboardViewController, GKMatchmakerViewController, GKTurnBasedMatchmakerViewController, GLKView, GLKViewController, HKActivityRingView, HMCameraView, ILClassificationUIExtensionViewController, INUIAddVoiceShortcutButton, INUIAddVoiceShortcutViewController, INUIEditVoiceShortcutViewController, LPLinkView, MCBrowserViewController, MFMailComposeViewController, MFMessageComposeViewController, MKAnnotationView, MKCircleView, MKCompassButton, MKLookAroundViewController, MKMapView, MKMarkerAnnotationView, MKOverlayPathView, MKOverlayView, MKPinAnnotationView, MKPolygonView, MKPolylineView, MKScaleView, MKUserLocationView, MKUserTrackingButton, MPMediaPickerController, MPMoviePlayerViewController, MPVolumeView, MSMessagesAppViewController, MSStickerBrowserView, MSStickerBrowserViewController, MSStickerView, MTKView, PDFThumbnailView, PDFView, PHLivePhotoView, PHPickerViewController, PKAddPassButton, PKAddPassesViewController, PKAddPaymentPassViewController, PKAddSecureElementPassViewController, PKCanvasView, PKIdentityButton, PKPayLaterView, PKPaymentAuthorizationViewController, PKPaymentButton, PKShareSecureElementPassViewController, QLPreviewController, RPBroadcastActivityViewController, RPPreviewViewController, RPSystemBroadcastPickerView, SCNView, SFSafariViewController, SKCloudServiceSetupViewController, SKStoreProductViewController, SKView, SLComposeServiceViewController, SLComposeViewController, STWebpageController, SWAttributionView, SWCollaborationView, SWRemoveParticipantAlertController, TWTweetComposeViewController, UIActionSheet, UIActivityIndicatorView, UIActivityViewController, UIAlertController, UIAlertView, UIButton, UICalendarView, UICloudSharingController, UICollectionReusableView, UICollectionView, UICollectionViewCell, UICollectionViewController, UICollectionViewListCell, UIColorPickerViewController, UIColorWell, UIContentUnavailableView, UIControl, UIDatePicker, UIDocumentBrowserViewController, UIDocumentMenuViewController, UIDocumentPickerExtensionViewController, UIDocumentPickerViewController, UIDocumentViewController, UIEventAttributionView, UIFontPickerViewController, UIImagePickerController, UIImageView, UIInputView, UIInputViewController, UILabel, UIListContentView, UINavigationBar, UINavigationController, UIPageControl, UIPageViewController, UIPasteControl, UIPickerView, UIPopoverBackgroundView, UIPopoverPresentationController, UIPresentationController, UIProgressView, UIReferenceLibraryViewController, UIRefreshControl, UIScreen, UIScrollView, UISearchBar, UISearchContainerViewController, UISearchController, UISearchTextField, UISegmentedControl, UISheetPresentationController, UISlider, UISplitViewController, UIStackView, UIStepper, UISwitch, UITabBar, UITabBarController, UITableView, UITableViewCell, UITableViewController, UITableViewHeaderFooterView, UITextField, UITextView, UIToolbar, UIVideoEditorController, UIView, UIViewController, UIVisualEffectView, UIWebView, UIWindow, UIWindowScene, VNDocumentCameraViewController, WKWebView
```
public interface UITraitEnvironment
```
Trait environments expose a trait collection that describes their environment.

Method Summary

All Methods Instance Methods Abstract Methods Deprecated Methods
Modifier and Type	Method	Description
`@NotNull UITraitCollection`	`traitCollection()`	API-Since: 8.0
`void`	`traitCollectionDidChange(@Nullable UITraitCollection previousTraitCollection)`	Deprecated.

- Method Detail
  - traitCollection
```
@NotNull
@NotNull UITraitCollection traitCollection()
```
    API-Since: 8.0
  - traitCollectionDidChange
```
@Deprecated
void traitCollectionDidChange(@Nullable
                              @Nullable UITraitCollection previousTraitCollection)
```
    Deprecated.
    
    To be overridden as needed to provide custom behavior when the environment's traits change. API-Since: 8.0 Deprecated-Since: 17.0 Deprecated-Message: Use the trait change registration APIs declared in the UITraitChangeObservable protocol

Interface UITraitEnvironment

Method Summary

Method Detail

traitCollection

traitCollectionDidChange