Type Property


Posted when the user changes the preferred content size setting.


static let UIContentSizeCategoryDidChange: NSNotification.Name


This notification is sent when the value in the preferredContentSizeCategory property changes. The userInfo dictionary of the notification contains the UIContentSizeCategoryNewValueKey key, which reflects the new setting.

See Also


static let UIApplicationBackgroundRefreshStatusDidChange: NSNotification.Name

Posted when the app’s status for downloading content in the background changes.

static let UIApplicationDidChangeStatusBarFrame: NSNotification.Name

Posted when the frame of the status bar changes.

static let UIApplicationDidChangeStatusBarOrientation: NSNotification.Name

Posted when the orientation of the app’s user interface changes.

static let UIApplicationDidEnterBackground: NSNotification.Name

Posted when the app enters the background.

static let UIApplicationDidFinishLaunching: NSNotification.Name

Posted immediately after the app finishes launching.

static let UIApplicationDidReceiveMemoryWarning: NSNotification.Name

Posted when the app receives a warning from the operating system about low memory availability.

static let UIApplicationProtectedDataDidBecomeAvailable: NSNotification.Name

Posted when the protected files become available for your code to access.

static let UIApplicationProtectedDataWillBecomeUnavailable: NSNotification.Name

Posted shortly before protected files are locked down and become inaccessible.

static let UIApplicationSignificantTimeChange: NSNotification.Name

Posted when there is a significant change in time, for example, change to a new day (midnight), carrier time update, and change to or from daylight savings time.

static let UIApplicationUserDidTakeScreenshot: NSNotification.Name

Posted when the user presses the Home and Lock buttons to take a screenshot.

static let UIApplicationWillChangeStatusBarOrientation: NSNotification.Name

Posted when the app is about to change the orientation of its interface.

static let UIApplicationWillChangeStatusBarFrame: NSNotification.Name

Posted when the app is about to change the frame of the status bar.

static let UIApplicationWillEnterForeground: NSNotification.Name

Posted shortly before an app leaves the background state on its way to becoming the active app.

static let UIApplicationWillResignActive: NSNotification.Name

Posted when the app is no longer active and loses focus.

static let UIApplicationWillTerminate: NSNotification.Name

Posted when the app is about to terminate.