Instance Method

application(_:willChangeStatusBarOrientation:duration:)

Tells the delegate when the interface orientation of the status bar is about to change.

Declaration

optional func application(_ application: UIApplication, willChangeStatusBarOrientation newStatusBarOrientation: UIInterfaceOrientation, duration: TimeInterval)

Parameters

application

Your singleton app object.

newStatusBarOrientation

A constant that indicates the new orientation of the app’s user interface; see Responding to App State Changes and System Events for details.

duration

The duration of the animation to the new orientation, in seconds.

Discussion

The delegate typically implements this method to prepare its windows and views for the new orientation. The delegate can get the current device orientation from the shared UIDevice object.

After calling this method, the app also posts a willChangeStatusBarOrientationNotification notification to give interested objects a chance to respond to the change.

See Also

Managing Interface Geometry

func application(UIApplication, supportedInterfaceOrientationsFor: UIWindow?) -> UIInterfaceOrientationMask

Asks the delegate for the interface orientations to use for the view controllers in the specified window.

func application(UIApplication, didChangeStatusBarOrientation: UIInterfaceOrientation)

Tells the delegate when the interface orientation of the status bar has changed.

func application(UIApplication, willChangeStatusBarFrame: CGRect)

Tells the delegate when the frame of the status bar is about to change.

func application(UIApplication, didChangeStatusBarFrame: CGRect)

Tells the delegate when the frame of the status bar has changed.

enum UIInterfaceOrientation

The orientation of the app's user interface.

struct UIInterfaceOrientationMask

These constants are mask bits for specifying a view controller’s supported interface orientations.

class let invalidInterfaceOrientationException: NSExceptionName

This exception is thrown if a view controller or the app returns 0 instead of a valid set of supported interface orientation values. It is also thrown if the orientation returned by a view controller’s preferredInterfaceOrientationForPresentation method does not match one of the view controller’s supported orientations.