<!--
{
  "availability" : [
    "iOS: -",
    "iPadOS: -",
    "macCatalyst: -",
    "macOS: -",
    "tvOS: -",
    "visionOS: -"
  ],
  "documentType" : "symbol",
  "framework" : "SystemConfiguration",
  "identifier" : "/documentation/SystemConfiguration/SCPreferencesCallBack",
  "metadataVersion" : "0.1.0",
  "role" : "Type Alias",
  "symbol" : {
    "kind" : "Type Alias",
    "modules" : [
      "System Configuration"
    ],
    "preciseIdentifier" : "c:@T@SCPreferencesCallBack"
  },
  "title" : "SCPreferencesCallBack"
}
-->

# SCPreferencesCallBack

Type of the callback function used when the preferences have been updated or applied.

```
typealias SCPreferencesCallBack = (SCPreferences, SCPreferencesNotification, UnsafeMutableRawPointer?) -> Void
```

## Parameters

`prefs`

The preferences session.

`notificationType`

The type of notification, such as changes committed or changes applied. See [`SCPreferencesNotification`](/documentation/SystemConfiguration/SCPreferencesNotification) for information about possible values.

`info`

A C pointer to a user-specified block of data.

## Topics

### Fields

[prefs](/documentation/SystemConfiguration/1808420-prefs)

The preferences session.

[notificationType](/documentation/SystemConfiguration/1808421-notificationtype)

The type of notification, such as changes committed or changes applied. See [`SCPreferencesNotification`](/documentation/SystemConfiguration/SCPreferencesNotification) for information about possible values.


---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)