A CFUserNotification object presents a simple dialog on the screen and optionally receives feedback from the user. The contents of the dialog can include a header, a message, an icon, text fields, a pop-up button, radio buttons or checkboxes, and up to three ordinary buttons. Use CFUserNotification in processes that do not otherwise have user interfaces, but may need occasional interaction with the user.

You create a user notification with the CFUserNotificationCreate(_:_:_:_:_:) function. You pass in a dictionary whose keys describe the items to place into the dialog. (See Dialog Description Keys for the list of keys.) A set of flags passed to the function determines, among other things, whether secure text fields are used (such as for password fields), whether radio buttons or checkboxes are used, and which of these buttons are checked by default. You can also specify a timeout for the dialog, in which case the dialog cancels itself if the user does not respond in the allotted time period.

A user notification displays its dialog as soon as it is created. If any reply is required, it may be awaited in one of two ways: either synchronously, using CFUserNotificationReceiveResponse(_:_:_:), or asynchronously, using a run loop source created with CFUserNotificationCreateRunLoopSource(_:_:_:_:). CFUserNotificationReceiveResponse(_:_:_:) has a timeout parameter that determines how long it will block (zero meaning indefinitely) and it may be called as many times as necessary until a response arrives. If a user notification has not yet received a response, it may be updated with new information or it may be cancelled. User notifications may not be reused.

CFUserNotification provides two convenience functions, CFUserNotificationDisplayNotice(_:_:_:_:_:_:_:_:) and CFUserNotificationDisplayAlert(_:_:_:_:_:_:_:_:_:_:_:), to display very basic dialogs that either require no response from the user or require only a single button to be pressed, respectively.


CFUserNotification Miscellaneous Functions

func CFUserNotificationCancel(CFUserNotification!)

Cancels a user notification dialog.

func CFUserNotificationCheckBoxChecked(CFIndex)

Returns a flag used to set or test a checkbox’s state.

func CFUserNotificationCreate(CFAllocator!, CFTimeInterval, CFOptionFlags, UnsafeMutablePointer<Int32>!, CFDictionary!)

Creates a CFUserNotification object and displays its notification dialog on screen.

func CFUserNotificationGetResponseDictionary(CFUserNotification!)

Returns the dictionary containing all the text field values from a dismissed notification dialog.

func CFUserNotificationGetResponseValue(CFUserNotification!, CFString!, CFIndex)

Extracts the values of the text fields from a dismissed notification dialog.

func CFUserNotificationGetTypeID()

Returns the type identifier for the CFUserNotification opaque type.

func CFUserNotificationPopUpSelection(CFIndex)

Returns a flag used to set the selected element of a pop-up menu.

func CFUserNotificationReceiveResponse(CFUserNotification!, CFTimeInterval, UnsafeMutablePointer<CFOptionFlags>!)

Waits for the user to respond to a notification or for the notification to time out.

func CFUserNotificationSecureTextField(CFIndex)

Returns a flag used to set the secure state of a text field.

func CFUserNotificationUpdate(CFUserNotification!, CFTimeInterval, CFOptionFlags, CFDictionary!)

Updates a displayed user notification dialog with new user interface information.


typealias CFUserNotificationCallBack

Callback invoked when an asynchronous user notification dialog is dismissed.

Data Types

class CFUserNotification

A reference to a user notification object.


Alert Levels

Flags identifying the seriousness of a user notification.

Response Codes

Response codes identifying the button that was pressed to dismiss a notification dialog.

Button Flags

Flags that alter the display of buttons in a user notification dialog.

Dialog Description Keys

Keys used in a user notification’s description dictionary, which describes the contents of the notification dialog to display.

See Also

Opaque Types


The CFFileDescriptor provides an opaque type to monitor file descriptors for read and write activity via CFRunLoop.


CFStringTokenizer allows you to tokenize strings into words, sentences or paragraphs in a language-neutral way. It supports languages such as Japanese and Chinese that do not delimit words by spaces, as well as de-compounding German compounds. You can obtain Latin transcription for tokens. It also provides language identification API.