The type used for the name of a notification.
SDKs
Framework
struct Name
In Objective-C, NSNotification names are type aliased to the NSString class. In Swift, Notification names use the nested NSNotification type.
static let AVAudioA notification posted when the audio engine configuration changes.
class let interruptionPosted when an audio interruption occurs.
class let mediaPosted when the media server is terminated.
class let mediaPosted when the media server restarts.
class let routePosted when the system’s audio route changes.
class let silencePosted when the primary audio from other applications starts and stops.
static let AVAudioThe component tags changed.
static let CKAccountNotification posted when the status of the signed-in iCloud account may have changed.
static let CLKComplicationPosted when the set of active complications changes.
static let CNContactPosted when changes occur to the contact store.
static let EKEventA notification posted when changes are made to the Calendar database.
static let HKUserNotifies observers whenever the user changes his or her preferred units.
let HMCharacteristicThe characteristic supports event notifications.
static let NSBundlePosted after the system detects that the amount of available disk space is getting low. The notification is posted to the default notification center.
static let NSCalendarA notification that is posted whenever the calendar day of the system changes, as determined by the system calendar, locale, and time zone.
static let NSDidNot implemented.
static let NSExtensionPosted when the extension’s host app moves from the inactive to the active state.
static let NSExtensionPosted when the extension’s host app begins running in the background.
static let NSExtensionPosted when the extension’s host app begins running in the foreground.
static let NSExtensionPosted when the extension’s host app moves from the active to the inactive state.
static let NSFileThis notification is posted when an NSFile object establishes a socket connection between two processes, creates an NSFile object for one end of the connection, and makes this object available to observers by putting it in the user dictionary.
static let NSFileThis notification is posted when the file handle determines that data is currently available for reading in a file or at a communications channel.
static let NSFileThis notification is posted when the file handle reads all data in the file or, if a communications channel, until the other process signals the end of data.
static let NSHTTPCookieA notification posted when the acceptance policy of the cookie storage has changed.
static let NSHTTPCookieA notification posted when the cookies stored in the cookie storage have changed.
static let NSManagedA notification that the context completed a save.
static let NSManagedA notification of changes made to managed objects associated with this context.
static let NSManagedA notification that the context is about to save.
static let NSMetadataPosted when the receiver has finished with the initial result-gathering phase of the query.
static let NSMetadataPosted when the receiver begins with the initial result-gathering phase of the query.
static let NSMetadataPosted when the receiver’s results have changed during the live-update phase of the query.
static let NSMetadataPosted as the receiver is collecting results during the initial result-gathering phase of the query.
static let NSPersistentPosted whenever persistent stores are added to or removed from a persistent store coordinator, or when store UUIDs change.
static let NSPersistentPosted before the list of open persistent stores changes.
static let NSPersistentPosted whenever a persistent store is removed from a persistent store coordinator.
static let NSProcessPosted when the power state (Low Power Mode is enabled or disabled) of an iOS device changes.
static let NSSystemA notification posted whenever the system clock is changed.
static let NSSystemA notification posted when the time zone changes.
static let NSThreadAn NSThread object posts this notification when it receives the exit() message, before the thread exits. Observer methods invoked to receive this notification execute in the exiting thread, before it exits.
static let NSURLCredentialA notification posted when the set of stored credentials changes.
static let NSUbiquitySent after the iCloud (“ubiquity”) identity has changed.
static let NSUndoPosted whenever an NSUndo object opens or closes an undo group (except when it opens a top-level group) and when checking the redo stack in can.
static let NSUndoPosted after an NSUndo object closes an undo group, which occurs in the implementation of the end method.
static let NSUndoPosted whenever an NSUndo object opens an undo group, which occurs in the implementation of the begin method.
static let NSUndoPosted just after an NSUndo object performs a redo operation (redo()).
static let NSUndoPosted just after an NSUndo object performs an undo operation.
static let NSUndoPosted before an NSUndo object closes an undo group, which occurs in the implementation of the end method.
static let NSUndoPosted just before an NSUndo object performs a redo operation (redo()).
static let NSUndoPosted just before an NSUndo object performs an undo operation.
static let NSWillPosted when the first thread is detached from the current thread. The NSThread class posts this notification at most once—the first time a thread is detached using detach or the start() method. Subsequent invocations of those methods do not post this notification. Observers of this notification have their notification method invoked in the main thread, not the new thread. The observer notification methods always execute before the new thread begins executing.
static let PKPassPosted after the pass library has been changed.
static let PKPassPosted when an Apple Pay card is added to or removed from a device that is paired with the current iOS device (for example, Apple Watch).
static let announcementPosted by UIKit when the system has finished reading an announcement.
static let elementPosted by UIKit when an assistive technology focuses on an element.
static let WKAudioPosted when the item has played successfully to its end time.
static let WKAudioPosted when the item failed to play to its end time.
static let WKAudioPosted when the item’s current time has changed discontinuously.
static let ABPeoplePosted when the displayed property in the record list is changed.
static let ABPeoplePosted when the selection in the group list is changed.
static let ABPeoplePosted when the selection in the name list is changed.
static let ABPeoplePosted when the selection in a multivalue property is changed.
static let ACAccountPosted when the accounts managed by this account store changed in the database.
static let AVCapturePosted when a new device becomes available.
static let AVCapturePosted when an existing device becomes unavailable.
static let AVCapturePosted if the value of the capture input port’sformat property changes.
static let AVCapturePosted when a capture session starts.
static let AVCapturePosted when a capture session stops.
static let AVCapturePosted if an error occurred during a capture session.
static let AVPlayerA notification that's posted when the item has played to its end time.
static let AVPlayerA notification that's posted when the item failed to play to its end time.
static let AVPlayerA notification that's posted when posted when a new access log entry has been added.
static let AVPlayerA notification that's posted when posted when a new error log entry has been added.
static let AVPlayerA notification that’s posted when some media doesn’t arrive in time to continue playback.
static let AVPlayerA notification that's posted when the item’s current time has changed discontinuously.
static let AVSamplePosted when a buffer display layer failed to decode.
static let GCControllerPosted immediately after a new controller is connected to the device.
static let GCControllerPosted immediately after a controller is disconnected from the device.
static let IKFilterPosted when the user double-clicks a filter in the filter browser.
static let IKFilterPosted when the user clicks a filter name in the filter browser.
static let IKFilterPosted before showing a filter preview, allowing an application to set the parameters of a filter.
static let MKAnnotationNotifies observers that the title or subtitle information of an annotation object changed.
static let NEFilterPosted after the filter configuration stored in the Network Extension preferences changes.
static let NEVPNConfigurationPosted after the VPN configuration stored in the Network Extension preferences changes.
static let NEVPNStatusPosted when the status of the VPN connection changes.
static let announcementThis notification is posted whenever an accessibility element needs to make an announcement to the user. This notification requires a user dictionary with the key announcement and a localized string containing the announcement. To help an assistive app determine the importance of the announcement, add the appropriate priority to the user dictionary.
static let applicationThis notification is posted after the app has been activated. Post this notification using the post(element: function instead of an NSNotification instance.
static let applicationThis notification is posted after the app has been deactivated. Post this notification using the post(element: function instead of an NSNotification instance.
static let applicationThis notification is posted after the app is hidden. Post this notification using the post(element: function instead of an NSNotification instance.
static let applicationThis notification is posted after the app is shown. Post this notification using the post(element: function instead of an NSNotification instance.
static let created: NSAccessibilityThis notification is posted after an accessibility element is created. Post this notification using the post(element: function instead of an NSNotification instance.
static let drawerThis notification is posted after a drawer appears. Post this notification using the post(element: function instead of an NSNotification instance.
static let focusedThis notification is posted after an accessibility element gains focus. Post this notification using the post(element: function instead of an NSNotification instance.
static let focusedThis notification is posted after the key window changes. Post this notification using the post(element: function instead of an NSNotification instance.
static let helpThis notification is posted after a help tag appears. Post this notification using the post(element: function instead of an NSNotification instance.
static let layoutThis notification is posted after the UI changes in a way that requires the attention of an accessibility client. This notification should be accompanied by a user dictionary with the key ui and an array containing the UI elements that have been added or changed. Post this notification using the post(element: function instead of an NSNotification instance.
static let mainThis notification is posted after the main window changes. Post this notification using the post(element: function instead of an NSNotification instance.
static let moved: NSAccessibilityThis notification is posted after an accessibility element moves. Post this notification using the post(element: function instead of an NSNotification instance.
static let resized: NSAccessibilityThis notification is posted after an accessibility element’s size changes. Post this notification using the post(element: function instead of an NSNotification instance.
static let rowThis notification is posted after a row collapses. Post this notification using the post(element: function instead of an NSNotification instance.
static let rowThis notification is posted after a row is added or deleted. Post this notification using the post(element: function instead of an NSNotification instance.
static let rowThis notification is posted after a row expands. Post this notification using the post(element: function instead of an NSNotification instance.
static let selectedThis notification is posted after one or more cells in a cell-based table are selected or deselected. Post this notification using the post(element: function instead of an NSNotification instance.
static let selectedThis notification is posted after one or more child elements are selected or deselected. Post this notification using the post(element: function instead of an NSNotification instance.
static let selectedThis notification is posted after the selected items in a layout area move. Post this notification using the post(element: function instead of an NSNotification instance.
static let selectedThis notification is posted after one or more columns are selected or deselected. Post this notification using the post(element: function instead of an NSNotification instance.
static let selectedThis notification is posted after one or more rows are selected or deselected. Post this notification using the post(element: function instead of an NSNotification instance.
static let selectedThis notification is posted after text is selected or deselected. Post this notification using the post(element: function instead of an NSNotification instance.
static let sheetThis notification is posted after a sheet appears. Post this notification using the post(element: function instead of an NSNotification instance.
static let titleThis notification is posted after an accessibility element’s title changes. Post this notification using the post(element: function instead of an NSNotification instance.
static let uiThis notification is posted after an accessibility element is destroyed. Post this notification using the post(element: function instead of an NSNotification instance.
static let unitsThis notification is posted after the units in a layout area change. Post this notification using the post(element: function instead of an NSNotification instance.
static let valueThis notification is posted after an accessibility element’s value changes. Post this notification using the post(element: function instead of an NSNotification instance.
static let windowThis notification is posted after a new window appears. Post this notification using the post(element: function instead of an NSNotification instance.
static let windowThis notification is posted after a window is restored to full size from the Dock. Post this notification using the post(element: function instead of an NSNotification instance.
static let windowThis notification is posted after a window is put in the Dock. Post this notification using the post(element: function instead of an NSNotification instance.
static let windowThis notification is posted after a window moves. Post this notification using the post(element: function instead of an NSNotification instance.
static let windowThis notification is posted after a window’s size changes. Post this notification using the post(element: function instead of an NSNotification instance.
class let progressPosted when the current progress of a running animation reaches one of its progress marks.
class let antialiasPosted after the threshold for antialiasing changes.
static let NSApplePosted by NSApple before it first dispatches an Apple event. Your application can use this notification to avoid registering any Apple event handlers until the first time at which they may be needed.
class let didPosted immediately after the app becomes active.
class let didPosted when the app’s occlusion state changes.
class let didPosted when the configuration of the displays attached to the computer is changed.
class let didPosted at the end of the finish method to indicate that the app has completed launching and is ready to run.
class let didPosted when the app has finished restoring windows.
class let didPosted at the end of the hide(_:) method to indicate that the app is now hidden.
class let didPosted immediately after the app gives up its active status to another app.
class let didPosted at the end of the unhide method to indicate that the app is now visible.
class let didPosted at the end of the update method to indicate that the app has finished updating its windows.
class let willPosted immediately before the app becomes active.
class let willPosted at the start of the finish method to indicate that the app has completed its initialization process and is about to finish launching.
class let willPosted at the start of the hide(_:) method to indicate that the app is about to be hidden.
class let willPosted immediately before the app gives up its active status to another app.
class let willPosted by the terminate(_:) method to indicate that the app will terminate.
class let willPosted at the start of the unhide method to indicate that the app is about to become visible.
class let willPosted at the start of the update method to indicate that the app is about to update its windows.
class let columnNotifies the delegate when the width of a browser column has changed.
static let NSClassPosted by init(for:) when a class description cannot be found for a class.
class let colorPosted when the color of the NSColor is set, as when NSColor is invoked.
class let selectionPosted after the pop-up list selection of the NSCombo changes.
class let selectionPosted whenever the pop-up list selection of the NSCombo is changing.
class let willPosted whenever the pop-up list of the NSCombo is about to be dismissed.
class let willPosted whenever the pop-up list of the NSCombo is going to be displayed.
class let contextPosted when the application enters context-sensitive help mode. This typically happens when the user holds down the Help key.
class let contextPosted when the application exits context-sensitive help mode. This happens when the user clicks the mouse button while the cursor is anywhere on the screen after displaying a context-sensitive help topic.
class let textSent when a control with editable cells begins an edit session.
class let textSent when the text in the receiving control changes.
class let textSent when a control with editable cells ends an editing session.
class let currentSent after the user changes control tint preference.
class let willPosted whenever the drawer is about to close.
class let willPosted whenever the drawer is about to open.
class let didPosted whenever a font collection is changed.
class let fontPosted after the currently-set font changes.
class let registryPosted whenever the NSImage class registry changes.
class let didPosted after a menu item is added to the menu.
class let didPosted when menu tracking begins.
class let didPosted after a menu item in the menu changes appearance.
class let didPosted when menu tracking ends, even if no action is sent.
class let didPosted after a menu item is removed from the menu.
class let didPosted just after the application dispatches a menu item’s action method to the menu item’s target.
class let willPosted just before the application dispatches a menu item’s action method to the menu item’s target.
class let columnPosted whenever a column is moved by user action in an NSOutline object.
class let columnPosted whenever a column is resized in an NSOutline object.
class let itemPosted whenever an item is collapsed in an NSOutline object.
class let itemPosted whenever an item is expanded in an NSOutline object.
class let itemPosted before an item is collapsed (after the user clicks the arrow but before the item is collapsed).
class let itemPosted before an item is expanded (after the user clicks the arrow but before the item is collapsed).
class let selectionPosted after the outline view's selection changes.
class let selectionPosted as the outline view’s selection changes (while the mouse button is still down).
static let NSPersistentPosted after records are imported from the ubiquitous content store.
class let willThis notification is posted just before a pop-up menu is attached to its window frame.
class let willPosted when an NSPop object receives a mouse-down event—that is, when the user is about to select an item from the menu.
class let didSent after the popover has finished animating offscreen.
class let didSent after the popover has finished animating onscreen.
class let willSent before the popover is closed.
class let willSent before the popover is shown.
static let NSPreferenceNotifies observers that the preference pane should not be deselected.
static let NSPreferenceNotifies observers that the preference pane may be deselected.
static let NSPreferenceNotifies observers that the user selected a new preference pane.
static let NSPreferenceNotifies observers that your help menu content changed.
static let NSPreferenceNotifies observers that the system preferences app is available to display your preferences.
class let preferredPosted if the preferred scroller style changes.
class let rowsThis notification is posted to the default notification center whenever the view's rows change.
class let colorPosted when the color space of the screen has changed.
class let didPosted at the end of a magnify gesture.
class let didPosted on the main thread at the end of live scroll tracking.
class let didPosted on the main thread after changing the clipview bounds origin due to a user-initiated event.
class let willPosted at the beginning of a magnify gesture.
class let willPosted on the main thread at the beginning of user-initiated live scroll tracking (gesture scroll or scroller tracking, for example, thumb dragging).
class let didThis notification is posted when the spell checker did change text using automatic spell checking correction. The are posted to the application’s default notification center.
class let didPosted when the spell checker changed text using automatic text replacement. This notification is posted to the app’s default notification center.
class let didPosted after an NSSplitView changes the sizes of some or all of its subviews.
class let willPosted before an NSSplitView changes the sizes of some or all of its subviews.
class let systemSent when the system colors have changed, such as through a system control panel interface.
class let columnPosted whenever a column is moved by user action in an NSTable object.
class let columnPosted whenever a column is resized in an NSTable object.
class let selectionPosted after an NSTable object's selection changes.
class let selectionPosted as an NSTable object's selection changes (while the mouse button is still down).
class let selectedPosted when the user selects an alternate string.
class let didPosted when an NSText object begins any operation that changes characters or formatting attributes.
class let didPosted after an NSText object performs any operation that changes characters or formatting attributes.
class let didPosted when focus leaves an NSText object, whether or not any operation has changed characters or formatting attributes.
class let keyboardPosted after the selected text input source changes.
class let didPosted after a text storage finishes processing edits in process.
class let willPosted before a text storage finishes processing edits in process.
class let didPosted when the selected range of characters changes.
class let didPosted when there is a change in the typing attributes within a text view.
class let willPosted when a new text view is established as the text view that sends notifications.
class let didPosted after an item is removed from a toolbar.
class let willPosted before a new item is added to the toolbar.
class let boundsPosted whenever the NSView’s bounds rectangle changes to a new value independently of the frame rectangle, but only when the view’s posts property is true.
class let didPosted whenever an NSView object recalculates its tracking areas.
class let framePosted whenever the view’s frame rectangle changes to a new value, but only when the view’s posts property is true.
class let globalPosted whenever an NSView object that has attached surfaces (that is, NSOpen objects) moves to a different screen, or other cases where the NSOpen object needs to be updated.
class let didPosted whenever an NSWindow object becomes the key window.
class let didPosted whenever an NSWindow object becomes the main window.
class let didPosted when the window backing properties change.
class let didPosted when the window’s occlusion state changes.
class let didPosted whenever a portion of an NSWindow object’s frame moves onto or off of a screen.
class let didPosted whenever the display profile for the screen containing the window changes.
class let didPosted whenever an NSWindow object is deminimized.
class let didPosted after the user resizes a window.
class let didPosted whenever an NSWindow object closes an attached sheet.
class let didPosted when the window entered full screen mode.
class let didPosted when the window will enter version browser mode.
class let didPosted when the window did exit full screen mode.
class let didPosted when the window did exit version browser mode.
class let didPosted whenever a portion of a nonretained NSWindow object is exposed, whether by being ordered in front of other windows or by other windows being removed from in front of it.
class let didPosted whenever an NSWindow object is minimized.
class let didPosted whenever an NSWindow object is moved.
class let didPosted whenever an NSWindow object resigns its status as key window.
class let didPosted whenever an NSWindow object resigns its status as main window.
class let didPosted whenever an NSWindow object’s size changes.
class let didPosted whenever an NSWindow object receives an update() message.
class let willPosted whenever an NSWindow object is about to open a sheet.
class let willPosted whenever an NSWindow object is about to close.
class let willPosted when the window will enter full screen mode.
class let willPosted when the window will enter version browser mode.
class let willPosted when the window will exit full screen mode.
class let willPosted when the window will exit version browser mode.
class let willPosted whenever an NSWindow object is about to be minimized.
class let willPosted whenever an NSWindow object is about to move.
class let willPosted before the user resizes a window.
class let accessibilityPosted when any of the accessibility display options change.
class let activePosted when a Spaces change has occurred.
class let didPosted when the Finder is about to activate an app.
class let didPosted when the Finder file labels or colors change.
class let didPosted when the Finder deactivated an app.
class let didPosted when the Finder hid an app.
class let didPosted when a new app has started up.
class let didPosted when a new device has been mounted.
class let didPosted when a file operation has been performed in the receiving app.
class let didPosted when a volume changes its name and/or mount path. These typically change simultaneously, in which case only one notification is posted.
class let didPosted when an app finishes executing.
class let didPosted when the Finder unhid an app.
class let didPosted when the Finder did unmount a device.
class let didPosted when the machine wakes from sleep.
class let screensPosted when the machine’s screen goes to sleep.
class let screensPosted when the machine’s screens wake.
class let sessionPosted after a user session is switched in.
class let sessionPosted before a user session is switched out.
class let willPosted when the Finder is about to launch an app.
class let willPosted when the user has requested a logout or that the machine be powered off.
class let willPosted before the machine goes to sleep.
class let willPosted when the Finder is about to unmount a device.
static let PDFDocumentA notification that the begin or find method begins finding.
static let PDFDocumentA notification that a find operation begins working on a new page of a document.
static let PDFDocumentA notification that a write operation begins working on a page in a document.
static let PDFDocumentA notification that a write operation begins working on a document.
static let PDFDocumentA notification that the begin or find method returns.
static let PDFDocumentA notification that a find operation finishes working on a page in a document.
static let PDFDocumentA notification that a write operation finishes working on a page in a document.
static let PDFDocumentA notification that a write operation finishes working on a document.
static let PDFDocumentA notification that a string match is found in a document.
static let PDFDocumentA notification that a document unlocks after a unlock(with message.
static let PDFViewA notification posted when the user clicks on an annotation.
static let PDFViewA notification posted before the user clicks an annotation.
static let PDFViewA notification posted when the page history changes.
static let PDFViewA notification posted when the user attempts to copy to the pasteboard without the appropriate permissions.
static let PDFViewA notification posted when the display box has changed.
static let PDFViewA notification posted when the display mode has changed.
static let PDFViewA notification posted when a new document is associated with the view.
static let PDFViewA notification posted when a new page becomes the current page.
static let PDFViewA notification posted when the user attempts to print without the appropriate permissions.
static let PDFViewA notification posted when the scale factor changes.
static let PDFViewA notification posted when the current selection has changed.
static let PDFViewA notification posted when the visible pages have changed.
static let QCCompositionPosted when the user chooses a composition.
static let QCCompositionPosted when the user selects a composition in the picker view.
static let QCCompositionPosted whenever the list of compositions in the composition repository is updated.
static let QCViewPosted when the view starts rendering.
static let QCViewPosted when the view stops rendering.
static let WebPosted when all history items have been removed from the web history.
static let WebPosted by a WebHistoryItem object when the value of the history item’s title, alternate title, URL strings, or last visited interval changes.
static let WebPosted when history items have been added to a web history.
static let WebPosted when items have been removed from the web history.
static let WebPosted when web history items have been loaded from a URL.
static let WebPosted when web history items have been saved to a URL.
static let WebPosted when the web preference settings are changed.
static let WebPosted when a web view begins any operation that changes its contents in response to user editing.
static let WebPosted when a web view performs any operation that changes its contents in response to user editing.
static let WebPosted when a web view changes its typing selection.
static let WebPosted when a web view changes its typing style.
static let WebPosted when a web view ends any operation that changes its contents in response to user editing.
static let WebPosted by a WebView object when the estimated progress value of a load changes.
static let WebPosted by a WebView object when the load has finished.
static let WebPosted by a WebView object when a load begins, including a load that is initiated in a subframe.
static let abPosted when this process has changed the Address Book database.
static let abPosted when a process other than the current one has changed the Address Book database.
static let EAAccessoryA notification that is posted when an accessory becomes connected and available for your application to use.
static let EAAccessoryA notification that is posted when an accessory is disconnected and no longer available for your application to use.
static let MPMoviePosted when the duration of a movie has been determined. There is no user dictionary.
static let MPMoviePosted when the available media types in a movie are determined. There is no user dictionary.
static let MPMoviePosted when the natural frame size of a movie is first determined or subsequently changes. There is no user dictionary.
static let MPMoviePosted when a movie player has entered full-screen mode. There is no user dictionary.
static let MPMoviePosted when a movie player has exited full-screen mode. There is no user dictionary.
static let MPMoviePosted when a movie player has started or ended playing a movie via AirPlay. There is no user dictionary.
static let MPMoviePosted when a movie player’s network buffering state has changed. There is no user dictionary.
static let MPMoviePosted when the currently playing movie has changed. There is no user dictionary.
static let MPMoviePosted when a movie has finished playing. The user dictionary of this notification contains the MPMovie key, which indicates the reason that playback finished. This notification is also sent when playback fails because of an error.
static let MPMoviePosted when a movie player’s playback state has changed. There is no user dictionary.
static let MPMoviePosted when the ready for display state changes.
static let MPMoviePosted when the scaling mode of a movie player has changed. There is no user dictionary.
static let MPMoviePosted when a request to capture a thumbnail from a movie has finished whether the request succeeded or failed. Upon successful capture of a thumbnail, the user dictionary contains values for the following keys:
static let MPMoviePosted when new timed metadata arrives.
static let MPMoviePosted when a movie player is about to enter full-screen mode. The user dictionary contains keys whose values describe the transition animation used to enter full-screen mode. See Fullscreen Notification Keys.
static let MPMoviePosted when a movie player is about to exit full-screen mode. The user dictionary contains keys whose values describe the transition animation used to exit full-screen mode. See Fullscreen Notification Keys.
static let MPMoviePosted when the source type of a movie was previously unknown and is newly available. There is no user dictionary.
static let SKCloudA notification name for indicating a change in the capabilities associated with the music library on the device.
static let SKStorefrontA notification name for indicating a change in the storefront identifier associated with the device.
static let TVTopA notification to post when your app’s Top Shelf content has changed.
static let assistivePosted by UIKit when the enabled status of AssistiveTouch changes in system preferences.
static let boldPosted by UIKit when the system’s Bold Text setting has changed.
static let closedPosted by UIKit when the setting for closed captioning has changed.
static let darkerPosted by UIKit when the system’s Darken Colors setting has changed.
static let grayscalePosted by UIKit when the system’s Grayscale setting has changed.
static let guidedPosted by UIKit when a Guided Access session starts or ends.
static let hearingPosted by UIKit when there is a change to the currently paired hearing devices.
static let invertPosted by UIKit when the setting for inverted colors has changed.
static let monoPosted by UIKit when system audio changes from stereo to mono.
static let reducePosted by UIKit when the system’s Reduce Motion setting has changed.
static let reducePosted by UIKit when the system’s Reduce Transparency system setting has changed.
static let shakePosted by UIKit when the system's shake to undo feature is enabled or disabled.
static let speakPosted by UIKit when the system’s Speak Screen setting has changed.
static let speakPosted by UIKit when the system’s Speak Selection setting has changed.
static let switchPosted by UIKit when the system’s Switch Control setting has changed.
class let didPosted when the app becomes active.
class let didPosted when the app enters the background.
class let didPosted immediately after the app finishes launching.
class let didPosted when the app receives a warning from the operating system about low memory availability.
class let significantPosted 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.
class let userPosted when the user presses the Home and Lock buttons to take a screenshot.
class let willPosted shortly before an app leaves the background state on its way to becoming the active app.
class let willPosted when the app is no longer active and loses focus.
class let willPosted when the app is about to terminate.
static let didPosted when the user changes the preferred content size setting.
class let proximityPosted when the state of the proximity sensor changes.
class let brightnessThis notification is posted when the brightness of a screen changes.
class let didThis notification is posted when a new screen is connected to the device.
class let didThis notification is posted when a screen is disconnected from the device.
class let modeThis notification is posted when the current mode of a screen changes.
class let selectionPosted when the selected row in the posting table view changes.
class let textNotifies observers that an editing session began in a text field. The affected text field is stored in the object parameter of the notification. The user dictionary is not used.
class let textNotifies observers that the text in a text field changed. The affected text field is stored in the object parameter of the notification.
class let textNotifies observers that the editing session ended for a text field. The affected text field is stored in the object parameter of the notification. The user dictionary is not used.
class let currentPosted when the current input mode changes.
class let textNotifies observers that an editing session began in a text view. The affected view is stored in the object parameter of the notification. The user dictionary is not used.
class let textNotifies observers that the text in a text view changed. The affected view is stored in the object parameter of the notification. The user dictionary is not used.
class let textNotifies observers that the editing session ended for a text view. The affected view is stored in the object parameter of the notification. The user dictionary is not used.
class let showPosted when a split view controller is expanded or collapsed.
class let didPosted when an UIWindow object becomes hidden.
class let didPosted whenever a UIWindow object becomes the key window.
class let didPosted when an UIWindow object becomes visible.
class let didPosted whenever a UIWindow object resigns its status as main window.
static let ALAssetsSent when the contents of the assets library have changed from under the app that is using the data.
static let AVCapturePosted when the instance of AVCapture has detected a substantial change to the video subject area.
static let AVCapturePosted if an interruption to a capture session finishes.
static let AVCapturePosted if a capture session is interrupted.
static let CTRadioThe name of the notification indicating that the radio access technology changed for one of the services.
static let MFMessagePosted when the value returned by the can class method has changed.
static let MPMediaIndicates the media library has changed.
static let MPMediaIndicates that the prepared to play status of the media player has changed.
static let MPMusicPosted when the currently playing media item has changed.
static let MPMusicPosted when the playback state changes programmatically or by user action.
static let MPMusicPosted when the audio playback volume for the music player has changed.
static let MPVolumeIndicates the active wireless route changed.
static let MPVolumeIndicates the available wireless routes changed.
static let NKIssuePosted when all assets of the issue have been downloaded.
class let backgroundPosted when the app’s status for downloading content in the background changes.
class let didPosted when the frame of the status bar changes.
class let didPosted when the orientation of the app’s user interface changes.
class let willPosted when the app is about to change the frame of the status bar.
class let willPosted when the app is about to change the orientation of its interface.
class let batteryPosted when the battery level changes.
class let batteryPosted when battery state changes.
class let orientationPosted when the orientation of the device changes.
class let statePosted by the document object when there is a change in the state of the document.
class let keyboardPosted immediately after a change in the keyboard’s frame.
class let keyboardPosted immediately after the dismissal of the keyboard.
class let keyboardPosted immediately after the display of the keyboard.
class let keyboardPosted immediately prior to a change in the keyboard’s frame.
class let keyboardPosted immediately prior to the dismissal of the keyboard.
class let keyboardPosted immediately prior to the display of the keyboard.
class let didPosted by the menu controller just after it hides the menu.
class let didPosted by the menu controller just after it shows the menu.
class let menuPosted when the frame of a visible menu changes.
class let willPosted by the menu controller just before it hides the menu.
class let willPosted by the menu controller just before it shows the menu.
class let changedPosted by a pasteboard object when its contents change.
class let removedPosted by a pasteboard object just before an app removes it.
class let protectedPosted when the protected files become available for your code to access.
class let protectedPosted shortly before protected files are locked down and become inaccessible.
static let MPMusicIndicates the music player's queue changed.
static let GKPlayerPosted after the is property of the shared local player object changes. The object property for this notification is a GKLocal object. Passing nil provides standard Notification Center behavior which is to receive the notification for any object.
static let GKPlayerPosted when a player object’s data changes.
static let NEDNSProxyA notification that is posted when the DNS proxy configuration changes.
static let SKStorefrontA notification name for indicating a change in the storefront country code associated with the device.
static let WKAccessibilityPosted by WatchKit when reduced motion is enabled or disabled. This notification does not include a parameter.
init?(coder: NSCoder)Initializes a notification with the data from an unarchiver.
init(name: NSNotificationReturns a new notification object with a specified name and object.
init(name: NSNotificationInitializes a notification with a specified name, object, and user information.