The type used for the name of a notification.
SDKs
Framework
typedef NSString *NSNotificationName;
In Objective-C, NSNotification names are type aliased to the NSString class. In Swift, Notification names use the nested NSNotification type.
AVAudioA notification posted when the audio engine configuration changes.
AVAudioA notification that’s posted when an audio interruption occurs.
AVAudioA notification that’s posted when the system terminates the media server.
AVAudioA notification that’s posted when the media server restarts.
AVAudioA notification that’s posted when the system’s audio route changes.
AVAudioA notification that’s posted when the primary audio from other applications starts and stops.
AVAudioThe component tags changed.
CKAccountNotification posted when the status of the signed-in iCloud account may have changed.
CLKComplicationPosted when the set of active complications changes.
CNContactPosted when changes occur to the contact store.
EKEventA notification posted when changes are made to the Calendar database.
HKUserNotifies observers whenever the user changes his or her preferred units.
HMCharacteristicThe characteristic supports event notifications.
NSBundlePosted after the system detects that the amount of available disk space is getting low. The notification is posted to the default notification center.
NSCalendarA notification that is posted whenever the calendar day of the system changes, as determined by the system calendar, locale, and time zone.
NSDidNot implemented.
NSExtensionPosted when the extension’s host app moves from the inactive to the active state.
NSExtensionPosted when the extension’s host app begins running in the background.
NSExtensionPosted when the extension’s host app begins running in the foreground.
NSExtensionPosted when the extension’s host app moves from the active to the inactive state.
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.
NSFileThis notification is posted when the file handle determines that data is currently available for reading in a file or at a communications channel.
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.
NSHTTPCookieA notification posted when the acceptance policy of the cookie storage has changed.
NSHTTPCookieA notification posted when the cookies stored in the cookie storage have changed.
NSManagedA notification that the context completed a save.
NSManagedA notification of changes made to managed objects associated with this context.
NSManagedA notification that the context is about to save.
NSMetadataPosted when the receiver has finished with the initial result-gathering phase of the query.
NSMetadataPosted when the receiver begins with the initial result-gathering phase of the query.
NSMetadataPosted when the receiver’s results have changed during the live-update phase of the query.
NSMetadataPosted as the receiver is collecting results during the initial result-gathering phase of the query.
NSPersistentPosted whenever persistent stores are added to or removed from a persistent store coordinator, or when store UUIDs change.
NSPersistentPosted before the list of open persistent stores changes.
NSPersistentPosted whenever a persistent store is removed from a persistent store coordinator.
NSProcessPosted when the power state (Low Power Mode is enabled or disabled) of an iOS device changes.
NSSystemA notification posted whenever the system clock is changed.
NSSystemA notification posted when the time zone changes.
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.
NSURLCredentialA notification posted when the set of stored credentials changes.
NSUbiquitySent after the iCloud (“ubiquity”) identity has changed.
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.
NSUndoPosted after an NSUndo object closes an undo group, which occurs in the implementation of the end method.
NSUndoPosted whenever an NSUndo object opens an undo group, which occurs in the implementation of the begin method.
NSUndoPosted just after an NSUndo object performs a redo operation (redo).
NSUndoPosted just after an NSUndo object performs an undo operation.
NSUndoPosted before an NSUndo object closes an undo group, which occurs in the implementation of the end method.
NSUndoPosted just before an NSUndo object performs a redo operation (redo).
NSUndoPosted just before an NSUndo object performs an undo operation.
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.
PKPassPosted after the pass library has been changed.
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).
UIAccessibilityPosted by UIKit when the system has finished reading an announcement.
UIAccessibilityPosted by UIKit when an assistive technology focuses on an element.
WKAudioA notification that the item has played successfully to its end.
WKAudioA notification that the item failed to play to its end.
WKAudioA notification that the item’s current time has changed discontinuously.
ABPeoplePosted when the displayed property in the record list is changed.
ABPeoplePosted when the selection in the group list is changed.
ABPeoplePosted when the selection in the name list is changed.
ABPeoplePosted when the selection in a multivalue property is changed.
ACAccountPosted when the accounts managed by this account store changed in the database.
AVCapturePosted when a new device becomes available.
AVCapturePosted when an existing device becomes unavailable.
AVCapturePosted if the value of the capture input port’sformat property changes.
AVCapturePosted when a capture session starts.
AVCapturePosted when a capture session stops.
AVCapturePosted if an error occurred during a capture session.
AVPlayerA notification that's posted when the item has played to its end time.
AVPlayerA notification that's posted when the item failed to play to its end time.
AVPlayerA notification that's posted when posted when a new access log entry has been added.
AVPlayerA notification that's posted when posted when a new error log entry has been added.
AVPlayerA notification that’s posted when some media doesn’t arrive in time to continue playback.
AVPlayerA notification that's posted when the item’s current time has changed discontinuously.
AVSamplePosted when a buffer display layer failed to decode.
CWBSSIDDidDeprecatedCWCountryDeprecatedCWLinkDeprecatedCWLinkDeprecatedCWModeDeprecatedCWPowerDeprecatedCWSSIDDidDeprecatedCWScanDeprecatedGCControllerPosted immediately after a new controller is connected to the device.
GCControllerPosted immediately after a controller is disconnected from the device.
IKFilterPosted when the user double-clicks a filter in the filter browser.
IKFilterPosted when the user clicks a filter name in the filter browser.
IKFilterPosted before showing a filter preview, allowing an application to set the parameters of a filter.
MKAnnotationNotifies observers that the title or subtitle information of an annotation object changed.
NEFilterPosted after the filter configuration stored in the Network Extension preferences changes.
NEVPNConfigurationPosted after the VPN configuration stored in the Network Extension preferences changes.
NEVPNStatusPosted when the status of the VPN connection changes.
NSAccessibilityThis notification is posted whenever an accessibility element needs to make an announcement to the user. This notification requires a user dictionary with the key NSAccessibility and a localized string containing the announcement. To help an assistive app determine the importance of the announcement, add the appropriate NSAccessibility to the user dictionary.
NSAccessibilityThis notification is posted after the app has been activated. Post this notification using the NSAccessibility function instead of an NSNotification instance.
NSAccessibilityThis notification is posted after the app has been deactivated. Post this notification using the NSAccessibility function instead of an NSNotification instance.
NSAccessibilityThis notification is posted after the app is hidden. Post this notification using the NSAccessibility function instead of an NSNotification instance.
NSAccessibilityThis notification is posted after the app is shown. Post this notification using the NSAccessibility function instead of an NSNotification instance.
NSAccessibilityThis notification is posted after an accessibility element is created. Post this notification using the NSAccessibility function instead of an NSNotification instance.
NSAccessibilityThis notification is posted after a drawer appears. Post this notification using the NSAccessibility function instead of an NSNotification instance.
NSAccessibilityThis notification is posted after an accessibility element gains focus. Post this notification using the NSAccessibility function instead of an NSNotification instance.
NSAccessibilityThis notification is posted after the key window changes. Post this notification using the NSAccessibility function instead of an NSNotification instance.
NSAccessibilityThis notification is posted after a help tag appears. Post this notification using the NSAccessibility function instead of an NSNotification instance.
NSAccessibilityThis 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 NSAccessibility and an array containing the UI elements that have been added or changed. Post this notification using the NSAccessibility function instead of an NSNotification instance.
NSAccessibilityThis notification is posted after the main window changes. Post this notification using the NSAccessibility function instead of an NSNotification instance.
NSAccessibilityThis notification is posted after an accessibility element moves. Post this notification using the NSAccessibility function instead of an NSNotification instance.
NSAccessibilityThis notification is posted after an accessibility element’s size changes. Post this notification using the NSAccessibility function instead of an NSNotification instance.
NSAccessibilityThis notification is posted after a row collapses. Post this notification using the NSAccessibility function instead of an NSNotification instance.
NSAccessibilityThis notification is posted after a row is added or deleted. Post this notification using the NSAccessibility function instead of an NSNotification instance.
NSAccessibilityThis notification is posted after a row expands. Post this notification using the NSAccessibility function instead of an NSNotification instance.
NSAccessibilityThis notification is posted after one or more cells in a cell-based table are selected or deselected. Post this notification using the NSAccessibility function instead of an NSNotification instance.
NSAccessibilityThis notification is posted after one or more child elements are selected or deselected. Post this notification using the NSAccessibility function instead of an NSNotification instance.
NSAccessibilityThis notification is posted after the selected items in a layout area move. Post this notification using the NSAccessibility function instead of an NSNotification instance.
NSAccessibilityThis notification is posted after one or more columns are selected or deselected. Post this notification using the NSAccessibility function instead of an NSNotification instance.
NSAccessibilityThis notification is posted after one or more rows are selected or deselected. Post this notification using the NSAccessibility function instead of an NSNotification instance.
NSAccessibilityThis notification is posted after text is selected or deselected. Post this notification using the NSAccessibility function instead of an NSNotification instance.
NSAccessibilityThis notification is posted after a sheet appears. Post this notification using the NSAccessibility function instead of an NSNotification instance.
NSAccessibilityThis notification is posted after an accessibility element’s title changes. Post this notification using the NSAccessibility function instead of an NSNotification instance.
NSAccessibilityThis notification is posted after an accessibility element is destroyed. Post this notification using the NSAccessibility function instead of an NSNotification instance.
NSAccessibilityThis notification is posted after the units in a layout area change. Post this notification using the NSAccessibility function instead of an NSNotification instance.
NSAccessibilityThis notification is posted after an accessibility element’s value changes. Post this notification using the NSAccessibility function instead of an NSNotification instance.
NSAccessibilityThis notification is posted after a new window appears. Post this notification using the NSAccessibility function instead of an NSNotification instance.
NSAccessibilityThis notification is posted after a window is restored to full size from the Dock. Post this notification using the NSAccessibility function instead of an NSNotification instance.
NSAccessibilityThis notification is posted after a window is put in the Dock. Post this notification using the NSAccessibility function instead of an NSNotification instance.
NSAccessibilityThis notification is posted after a window moves. Post this notification using the NSAccessibility function instead of an NSNotification instance.
NSAccessibilityThis notification is posted after a window’s size changes. Post this notification using the NSAccessibility function instead of an NSNotification instance.
NSAnimationPosted when the current progress of a running animation reaches one of its progress marks.
NSAntialiasPosted after the threshold for antialiasing changes.
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.
NSApplicationPosted immediately after the app becomes active.
NSApplicationPosted when the app’s occlusion state changes.
NSApplicationPosted when the configuration of the displays attached to the computer is changed.
NSApplicationPosted at the end of the finish method to indicate that the app has completed launching and is ready to run.
NSApplicationPosted when the app has finished restoring windows.
NSApplicationPosted at the end of the hide: method to indicate that the app is now hidden.
NSApplicationPosted immediately after the app gives up its active status to another app.
NSApplicationPosted at the end of the unhide method to indicate that the app is now visible.
NSApplicationPosted at the end of the update method to indicate that the app has finished updating its windows.
NSApplicationPosted immediately before the app becomes active.
NSApplicationPosted at the start of the finish method to indicate that the app has completed its initialization process and is about to finish launching.
NSApplicationPosted at the start of the hide: method to indicate that the app is about to be hidden.
NSApplicationPosted immediately before the app gives up its active status to another app.
NSApplicationPosted by the terminate: method to indicate that the app will terminate.
NSApplicationPosted at the start of the unhide method to indicate that the app is about to become visible.
NSApplicationPosted at the start of the update method to indicate that the app is about to update its windows.
NSBrowserNotifies the delegate when the width of a browser column has changed.
NSClassPosted by class when a class description cannot be found for a class.
NSColorPosted when the color of the NSColor is set, as when NSColor is invoked.
NSComboPosted after the pop-up list selection of the NSCombo changes.
NSComboPosted whenever the pop-up list selection of the NSCombo is changing.
NSComboPosted whenever the pop-up list of the NSCombo is about to be dismissed.
NSComboPosted whenever the pop-up list of the NSCombo is going to be displayed.
NSContextPosted when the application enters context-sensitive help mode. This typically happens when the user holds down the Help key.
NSContextPosted 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.
NSControlSent when a control with editable cells begins an edit session.
NSControlSent when the text in the receiving control changes.
NSControlSent when a control with editable cells ends an editing session.
NSFontPosted whenever a font collection is changed.
NSFontPosted after the currently-set font changes.
NSImagePosted whenever the NSImage class registry changes.
NSMenuPosted after a menu item is added to the menu.
NSMenuPosted when menu tracking begins.
NSMenuPosted after a menu item in the menu changes appearance.
NSMenuPosted when menu tracking ends, even if no action is sent.
NSMenuPosted after a menu item is removed from the menu.
NSMenuPosted just after the application dispatches a menu item’s action method to the menu item’s target.
NSMenuPosted just before the application dispatches a menu item’s action method to the menu item’s target.
NSOutlinePosted whenever a column is moved by user action in an NSOutline object.
NSOutlinePosted whenever a column is resized in an NSOutline object.
NSOutlinePosted whenever an item is collapsed in an NSOutline object.
NSOutlinePosted whenever an item is expanded in an NSOutline object.
NSOutlinePosted before an item is collapsed (after the user clicks the arrow but before the item is collapsed).
NSOutlinePosted before an item is expanded (after the user clicks the arrow but before the item is collapsed).
NSOutlinePosted after the outline view's selection changes.
NSOutlinePosted as the outline view’s selection changes (while the mouse button is still down).
NSPersistentPosted after records are imported from the ubiquitous content store.
NSPopThis notification is posted just before a pop-up menu is attached to its window frame.
NSPopPosted when an NSPop object receives a mouse-down event—that is, when the user is about to select an item from the menu.
NSPopoverSent after the popover has finished animating offscreen.
NSPopoverSent after the popover has finished animating onscreen.
NSPopoverSent before the popover is closed.
NSPopoverSent before the popover is shown.
NSPreferenceNotifies observers that the preference pane should not be deselected.
NSPreferenceNotifies observers that the preference pane may be deselected.
NSPreferenceNotifies observers that the user selected a new preference pane.
NSPreferenceNotifies observers that your help menu content changed.
NSPreferenceNotifies observers that the system preferences app is available to display your preferences.
NSPreferredPosted if the preferred scroller style changes.
NSRuleThis notification is posted to the default notification center whenever the view's rows change.
NSScreenPosted when the color space of the screen has changed.
NSScrollPosted at the end of a magnify gesture.
NSScrollPosted on the main thread at the end of live scroll tracking.
NSScrollPosted on the main thread after changing the clipview bounds origin due to a user-initiated event.
NSScrollPosted at the beginning of a magnify gesture.
NSScrollPosted on the main thread at the beginning of user-initiated live scroll tracking (gesture scroll or scroller tracking, for example, thumb dragging).
NSSpellThis 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.
NSSpellPosted when the spell checker changed text using automatic text replacement. This notification is posted to the app’s default notification center.
NSSplitPosted after an NSSplitView changes the sizes of some or all of its subviews.
NSSplitPosted before an NSSplitView changes the sizes of some or all of its subviews.
NSSystemSent when the system colors have changed, such as through a system control panel interface.
NSTablePosted whenever a column is moved by user action in an NSTable object.
NSTablePosted whenever a column is resized in an NSTable object.
NSTablePosted after an NSTable object's selection changes.
NSTablePosted as an NSTable object's selection changes (while the mouse button is still down).
NSTextPosted when the user selects an alternate string.
NSTextPosted when an NSText object begins any operation that changes characters or formatting attributes.
NSTextPosted after an NSText object performs any operation that changes characters or formatting attributes.
NSTextPosted when focus leaves an NSText object, whether or not any operation has changed characters or formatting attributes.
NSTextPosted after the selected text input source changes.
NSTextPosted after a text storage finishes processing edits in process.
NSTextPosted before a text storage finishes processing edits in process.
NSTextPosted when the selected range of characters changes.
NSTextPosted when there is a change in the typing attributes within a text view.
NSTextPosted when a new text view is established as the text view that sends notifications.
NSToolbarPosted after an item is removed from a toolbar.
NSToolbarPosted before a new item is added to the toolbar.
NSViewPosted 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 YES.
NSViewPosted whenever an NSView object recalculates its tracking areas.
NSViewDeprecated in macOS 10.4 and later. Posted for an NSView object and each of its descendants (recursively) whenever the frame or bounds geometry of the view changed.
NSViewPosted whenever the view’s frame rectangle changes to a new value, but only when the view’s posts property is YES.
NSViewPosted 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.
NSWindowPosted whenever an NSWindow object becomes the key window.
NSWindowPosted whenever an NSWindow object becomes the main window.
NSWindowPosted when the window backing properties change.
NSWindowPosted when the window’s occlusion state changes.
NSWindowPosted whenever a portion of an NSWindow object’s frame moves onto or off of a screen.
NSWindowPosted whenever the display profile for the screen containing the window changes.
NSWindowPosted whenever an NSWindow object is deminimized.
NSWindowPosted after the user resizes a window.
NSWindowPosted whenever an NSWindow object closes an attached sheet.
NSWindowPosted when the window entered full screen mode.
NSWindowPosted when the window will enter version browser mode.
NSWindowPosted when the window did exit full screen mode.
NSWindowPosted when the window did exit version browser mode.
NSWindowPosted 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.
NSWindowPosted whenever an NSWindow object is minimized.
NSWindowPosted whenever an NSWindow object is moved.
NSWindowPosted whenever an NSWindow object resigns its status as key window.
NSWindowPosted whenever an NSWindow object resigns its status as main window.
NSWindowPosted whenever an NSWindow object’s size changes.
NSWindowPosted whenever an NSWindow object receives an update message.
NSWindowPosted whenever an NSWindow object is about to open a sheet.
NSWindowPosted whenever an NSWindow object is about to close.
NSWindowPosted when the window will enter full screen mode.
NSWindowPosted when the window will enter version browser mode.
NSWindowPosted when the window will exit full screen mode.
NSWindowPosted when the window will exit version browser mode.
NSWindowPosted whenever an NSWindow object is about to be minimized.
NSWindowPosted whenever an NSWindow object is about to move.
NSWindowPosted before the user resizes a window.
NSWorkspaceA notification that the workspace posts when any of the accessibility display options change.
NSWorkspaceA notification that the workspace posts when a Spaces change occurs.
NSWorkspaceA notification that the workspace posts when the Finder is about to activate an app.
NSWorkspaceA notification that the workspace posts when the Finder file labels or colors change.
NSWorkspaceA notification that the workspace posts when the Finder deactivated an app.
NSWorkspaceA notification that the workspace posts when the Finder hid an app.
NSWorkspaceA notification that the workspace posts when a new app has started up.
NSWorkspaceA notification that the workspace posts when a new device has been mounted.
NSWorkspacePosted when a file operation has been performed in the receiving app.
NSWorkspaceA notification that the workspace posts when a volume changes its name or mount path.
NSWorkspaceA notification that the workspace posts when an app finishes executing.
NSWorkspaceA notification that the workspace posts when the Finder unhid an app.
NSWorkspaceA notification that the workspace posts when the Finder unmounts a device.
NSWorkspaceA notification that the workspace posts when the machine wakes from sleep.
NSWorkspaceA notification that the workspace posts when the machine’s screen goes to sleep.
NSWorkspaceA notification that the workspace posts when the machine’s screens wake.
NSWorkspaceA notification that the workspace posts after a user session is switched in.
NSWorkspaceA notification that the workspace posts before a user session is switched out.
NSWorkspaceA notification that the workspace posts when the Finder is about to launch an app.
NSWorkspaceA notification that the workspace posts when the user requests a logout or powers off the machine.
NSWorkspaceA notification that the workspace posts before the machine goes to sleep.
NSWorkspaceA notification that the workspace posts when the Finder is about to unmount a device.
PDFDocumentA notification that the begin or find method begins finding.
PDFDocumentA notification that a find operation begins working on a new page of a document.
PDFDocumentA notification that a write operation begins working on a page in a document.
PDFDocumentA notification that a write operation begins working on a document.
PDFDocumentA notification that the begin or find method returns.
PDFDocumentA notification that a find operation finishes working on a page in a document.
PDFDocumentA notification that a write operation finishes working on a page in a document.
PDFDocumentA notification that a write operation finishes working on a document.
PDFDocumentA notification that a string match is found in a document.
PDFDocumentA notification that a document unlocks after a unlock message.
PDFViewA notification posted when the user clicks on an annotation.
PDFViewA notification posted before the user clicks an annotation.
PDFViewA notification posted when the page history changes.
PDFViewA notification posted when the user attempts to copy to the pasteboard without the appropriate permissions.
PDFViewA notification posted when the display box has changed.
PDFViewA notification posted when the display mode has changed.
PDFViewA notification posted when a new document is associated with the view.
PDFViewA notification posted when a new page becomes the current page.
PDFViewA notification posted when the user attempts to print without the appropriate permissions.
PDFViewA notification posted when the scale factor changes.
PDFViewA notification posted when the current selection has changed.
PDFViewA notification posted when the visible pages have changed.
QCCompositionPosted when the user chooses a composition.
QCCompositionPosted when the user selects a composition in the picker view.
QCCompositionPosted whenever the list of compositions in the composition repository is updated.
WebPosted when all history items have been removed from the web history.
WebPosted by a WebHistoryItem object when the value of the history item’s title, alternate title, URL strings, or last visited interval changes.
WebPosted when history items have been added to a web history.
WebPosted when items have been removed from the web history.
WebPosted when a web view begins any operation that changes its contents in response to user editing.
WebPosted when a web view performs any operation that changes its contents in response to user editing.
WebPosted when a web view changes its typing selection.
WebPosted when a web view changes its typing style.
WebPosted when a web view ends any operation that changes its contents in response to user editing.
WebPosted by a WebView object when the estimated progress value of a load changes.
WebPosted by a WebView object when a load begins, including a load that is initiated in a subframe.
kPosted when this process has changed the Address Book database.
kPosted when a process other than the current one has changed the Address Book database.
EAAccessoryA notification that is posted when an accessory becomes connected and available for your application to use.
EAAccessoryA notification that is posted when an accessory is disconnected and no longer available for your application to use.
MPMoviePosted when the duration of a movie has been determined. There is no user dictionary.
MPMoviePosted when the available media types in a movie are determined. There is no user dictionary.
MPMoviePosted when the natural frame size of a movie is first determined or subsequently changes. There is no user dictionary.
MPMoviePosted when a movie player has entered full-screen mode. There is no user dictionary.
MPMoviePosted when a movie player has exited full-screen mode. There is no user dictionary.
MPMoviePosted when a movie player has started or ended playing a movie via AirPlay. There is no user dictionary.
MPMoviePosted when a movie player’s network buffering state has changed. There is no user dictionary.
MPMoviePosted when the currently playing movie has changed. There is no user dictionary.
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.
MPMoviePosted when a movie player’s playback state has changed. There is no user dictionary.
MPMoviePosted when the ready for display state changes.
MPMoviePosted when the scaling mode of a movie player has changed. There is no user dictionary.
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:
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.
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.
MPMoviePosted when the source type of a movie was previously unknown and is newly available. There is no user dictionary.
SKCloudA notification name for indicating a change in the capabilities associated with the music library on the device.
SKStorefrontA notification name for indicating a change in the storefront identifier associated with the device.
TVTopA notification to post when your app’s Top Shelf content has changed.
UIAccessibilityPosted by UIKit when the enabled status of AssistiveTouch changes in system preferences.
UIAccessibilityPosted by UIKit when the system’s Bold Text setting has changed.
UIAccessibilityPosted by UIKit when the setting for closed captioning has changed.
UIAccessibilityPosted by UIKit when the system’s Darken Colors setting has changed.
UIAccessibilityPosted by UIKit when the system’s Grayscale setting has changed.
UIAccessibilityPosted by UIKit when a Guided Access session starts or ends.
UIAccessibilityPosted by UIKit when there is a change to the currently paired hearing devices.
UIAccessibilityPosted by UIKit when the setting for inverted colors has changed.
UIAccessibilityPosted by UIKit when system audio changes from stereo to mono.
UIAccessibilityPosted by UIKit when the system’s Reduce Motion setting has changed.
UIAccessibilityPosted by UIKit when the system’s Reduce Transparency system setting has changed.
UIAccessibilityPosted by UIKit when the system's shake to undo feature is enabled or disabled.
UIAccessibilityPosted by UIKit when the system’s Speak Screen setting has changed.
UIAccessibilityPosted by UIKit when the system’s Speak Selection setting has changed.
UIAccessibilityPosted by UIKit when the system’s Switch Control setting has changed.
UIApplicationPosted when the app becomes active.
UIApplicationPosted when the app enters the background.
UIApplicationPosted immediately after the app finishes launching.
UIApplicationPosted when the app receives a warning from the operating system about low memory availability.
UIApplicationPosted 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.
UIApplicationPosted when the user presses the Home and Lock buttons to take a screenshot.
UIApplicationPosted shortly before an app leaves the background state on its way to becoming the active app.
UIApplicationPosted when the app is no longer active and loses focus.
UIApplicationPosted when the app is about to terminate.
UIContentPosted when the user changes the preferred content size setting.
UIDevicePosted when the state of the proximity sensor changes.
UIScreenThis notification is posted when the brightness of a screen changes.
UIScreenThis notification is posted when a new screen is connected to the device.
UIScreenThis notification is posted when a screen is disconnected from the device.
UIScreenThis notification is posted when the current mode of a screen changes.
UITablePosted when the selected row in the posting table view changes.
UITextNotifies 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.
UITextNotifies observers that the text in a text field changed. The affected text field is stored in the object parameter of the notification.
UITextNotifies 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.
UITextPosted when the current input mode changes.
UITextNotifies 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.
UITextNotifies 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.
UITextNotifies 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.
UIViewPosted when a split view controller is expanded or collapsed.
UIWindowPosted when an UIWindow object becomes hidden.
UIWindowPosted whenever a UIWindow object becomes the key window.
UIWindowPosted when an UIWindow object becomes visible.
UIWindowPosted whenever a UIWindow object resigns its status as main window.
ALAssetsSent when the contents of the assets library have changed from under the app that is using the data.
AVCapturePosted when the instance of AVCapture has detected a substantial change to the video subject area.
AVCapturePosted if an interruption to a capture session finishes.
AVCapturePosted if a capture session is interrupted.
CTRadioThe name of the notification indicating that the radio access technology changed for one of the services.
MFMessagePosted when the value returned by the can class method has changed.
MPMediaIndicates the media library has changed.
MPMediaIndicates that the prepared to play status of the media player has changed.
MPMusicPosted when the currently playing media item has changed.
MPMusicPosted when the playback state changes programmatically or by user action.
MPMusicPosted when the audio playback volume for the music player has changed.
MPVolumeIndicates the active wireless route changed.
MPVolumeIndicates the available wireless routes changed.
NKIssuePosted when all assets of the issue have been downloaded.
UIApplicationPosted when the app’s status for downloading content in the background changes.
UIApplicationPosted when the frame of the status bar changes.
UIApplicationPosted when the orientation of the app’s user interface changes.
UIApplicationPosted when the app is about to change the frame of the status bar.
UIApplicationPosted when the app is about to change the orientation of its interface.
UIDevicePosted when the battery level changes.
UIDevicePosted when battery state changes.
UIDevicePosted when the orientation of the device changes.
UIDocumentPosted by the document object when there is a change in the state of the document.
UIKeyboardPosted immediately after a change in the keyboard’s frame.
UIKeyboardPosted immediately after the dismissal of the keyboard.
UIKeyboardPosted immediately after the display of the keyboard.
UIKeyboardPosted immediately prior to a change in the keyboard’s frame.
UIKeyboardPosted immediately prior to the dismissal of the keyboard.
UIKeyboardPosted immediately prior to the display of the keyboard.
UIMenuPosted by the menu controller just after it hides the menu.
UIMenuPosted by the menu controller just after it shows the menu.
UIMenuPosted when the frame of a visible menu changes.
UIMenuPosted by the menu controller just before it hides the menu.
UIMenuPosted by the menu controller just before it shows the menu.
UIPasteboardPosted by a pasteboard object when its contents change.
UIPasteboardPosted by a pasteboard object just before an app removes it.
UIApplicationPosted when the protected files become available for your code to access.
UIApplicationPosted shortly before protected files are locked down and become inaccessible.
MPMusicIndicates the music player's queue changed.
AVRouteThe values of multiple changed.
GKPlayerPosted after the authenticated 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.
GKPlayerPosted when a player object’s data changes.
NEDNSProxyA notification that is posted when the DNS proxy configuration changes.
SKStorefrontA notification name for indicating a change in the storefront country code associated with the device.
WKAccessibilityPosted by WatchKit when reduced motion is enabled or disabled. This notification does not include a parameter.
- initInitializes an empty notification.
- initInitializes a notification with the data from an unarchiver.
+ notificationReturns a new notification object with a specified name and object.
+ notificationReturns a notification object with a specified name, object, and user information.
- initInitializes a notification with a specified name, object, and user information.