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# NSUserDefaultsController

A controller that accesses user preference information for your app from the user’s defaults database.

```
class NSUserDefaultsController
```

## Overview

[`NSUserDefaultsController`](/documentation/AppKit/NSUserDefaultsController) is a Cocoa bindings–compatible controller class. Properties of the shared instance of this class can be bound to user interface elements to access and modify values stored in <doc://com.apple.documentation/documentation/Foundation/UserDefaults>.

## Topics

### Obtaining the shared instance

[`shared`](/documentation/AppKit/NSUserDefaultsController/shared)

Returns the shared instance of NSUserDefaultsController, creating it if necessary.

### Initializing a user defaults controller

[`init(defaults:initialValues:)`](/documentation/AppKit/NSUserDefaultsController/init(defaults:initialValues:))

Returns an initialized NSUserDefaultsController object using the NSUserDefaults instance specified in `defaults` and the initial default values contained in the `initialValues` dictionary.

[`init(coder:)`](/documentation/AppKit/NSUserDefaultsController/init(coder:))

### Managing user defaults values

[`defaults`](/documentation/AppKit/NSUserDefaultsController/defaults)

Returns the instance of NSUserDefaults in use by the receiver.

[`initialValues`](/documentation/AppKit/NSUserDefaultsController/initialValues)

Returns a dictionary containing the receiver’s initial default values.

[`hasUnappliedChanges`](/documentation/AppKit/NSUserDefaultsController/hasUnappliedChanges)

Returns whether the receiver has user default values that have not been saved to NSUserDefaults.

[`appliesImmediately`](/documentation/AppKit/NSUserDefaultsController/appliesImmediately)

Returns whether any changes made to bound user default properties are saved immediately.

[`values`](/documentation/AppKit/NSUserDefaultsController/values)

Returns a key value coding compliant object that is used to access the user default properties.

[`revert(_:)`](/documentation/AppKit/NSUserDefaultsController/revert(_:))

Causes the receiver to discard any unsaved changes to bound user default properties, restoring their previous values.

[`revertToInitialValues(_:)`](/documentation/AppKit/NSUserDefaultsController/revertToInitialValues(_:))

Causes the receiver to discard all edits and replace the values of all the user default properties with any corresponding values in the [`initialValues`](/documentation/AppKit/NSUserDefaultsController/initialValues) dictionary.

[`save(_:)`](/documentation/AppKit/NSUserDefaultsController/save(_:))

Saves the values of the receiver’s user default properties.


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