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The Reference Library is a comprehensive collection of Apple technical resources, including Articles, Guides, Reference, Release Notes, Sample Code, Technical Notes, and Technical Q&As. Each of the links below leads to the resources for a specific topic.

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NSSecureTextField Class Reference (HTML) (PDF)
Describes a text field that hides its text.
Cocoa Reference 2006-05-23
NSSecureTextFieldCell Class Reference (HTML) (PDF)
Describes the user interface of a secure text field.
Cocoa Reference 2007-10-31
NSSegmentedCell Class Reference (HTML) (PDF)
Describes an action cell that provides appearance and behavior for an NSSegmentedControl object.
Cocoa Reference 2009-05-06
NSSegmentedControl Class Reference (HTML) (PDF)
Describes a horizontal button divided into multiple segments
Cocoa Reference 2009-05-06
NSSerializer Class Reference (HTML) (PDF)
Describes a deprecated technology replaced by the NSPropertyListSerialization class.
Cocoa Reference 2006-05-23
NSServicesRequests Protocol Reference (HTML) (PDF)
Describes the interface for transferring data to the pasteboard during service requests.
Cocoa Reference 2007-01-30
NSSet Class Reference (HTML) (PDF)
Describes an immutable unordered collection of distinct elements.
Cocoa Reference 2008-10-15
NSSetCommand Class Reference (HTML) (PDF)
Describes the class used to set values in a scriptable object.
Cocoa Reference 2006-05-23
NSShadow Class Reference (HTML) (PDF)
Describes a drop shadow for a drawing operation.
Cocoa Reference 2009-02-04
NSSimpleHorizontalTypesetter Class Reference (HTML) (PDF)
Deprecated - Describes the deprecated technology replaced by NSATSTypesetter.
Cocoa Reference 2006-05-23
NSSlider Class Reference (HTML) (PDF)
Describes a control for selecting a value from a continuous range of values.
Cocoa Reference 2006-05-23
NSSliderCell Class Reference (HTML) (PDF)
Describes an action cell that provides appearance and behavior for an NSSlider object.
Cocoa Reference 2006-05-23
NSSocketPort Class Reference (HTML) (PDF)
Describes a BSD socket for distributed object connections or raw messaging.
Cocoa Reference 2008-10-15
NSSocketPortNameServer Class Reference (HTML) (PDF)
Describes a registrar of named TCP/IP sockets.
Cocoa Reference 2007-02-26
NSSortDescriptor Class Reference (HTML) (PDF)
Describes the rules for a sorting operation.
Cocoa Reference 2007-10-31
NSSound Class Reference (HTML) (PDF)
Describes an object that loads and plays audio files.
Cocoa Reference 2008-10-15
NSSpecifierTest Class Reference (HTML) (PDF)
Describes the class used to apply a test to compare a specified object to another object.
Cocoa Reference 2006-06-28
NSSpeechRecognizer Class Reference (HTML) (PDF)
Describes the Cocoa command-and-control voice recognition system.
Cocoa Reference 2007-04-03
NSSpeechSynthesizer Class Reference (HTML) (PDF)
Describes the Cocoa parser that converts text to speech.
Cocoa Reference 2009-01-06
NSSpellChecker Class Reference (HTML) (PDF)
Describes the interface to the Cocoa spell-checking service.
Cocoa Reference 2007-04-27
NSSpellServer Class Reference (HTML) (PDF)
Describes an application-defined spell-checking service.
Cocoa Reference 2007-04-27
NSSplitView Class Reference (HTML) (PDF)
Describes a container for subviews with a user-controlled portion of each visible.
Cocoa Reference 2009-04-08
NSStatusBar Class Reference (HTML) (PDF)
Describes the collection of status items in the menu bar.
Cocoa Reference 2007-03-05
NSStatusItem Class Reference (HTML) (PDF)
Describes a status item in the menu bar.
Cocoa Reference 2007-03-05
NSStepper Class Reference (HTML) (PDF)
Describes a control that can increment and decrement a value.
Cocoa Reference 2006-05-23
NSStepperCell Class Reference (HTML) (PDF)
Describes an action cell that provides appearance and behavior for an NSStepper object.
Cocoa Reference 2006-05-23
NSStream Class Reference (HTML) (PDF)
Describes an interface for reading and writing data.
Cocoa Reference 2008-10-15
NSString Application Kit Additions Reference (HTML) (PDF)
Describes additions for drawing strings.
Cocoa Reference 2009-02-04
NSString Class Reference (HTML) (PDF)
Describes an immutable character string.
Cocoa Reference 2009-02-04
NSTableColumn Class Reference (HTML) (PDF)
Describes the display characteristics and attribute identifiers for a column in a table view.
Cocoa Reference 2007-10-31
NSTableDataSource Protocol Reference (HTML) (PDF)
Describes the interface for receiving table view data requests.
Cocoa Reference 2007-04-10
NSTableHeaderCell Class Reference (HTML) (PDF)
Describes the user interface of a column header of a table view.
Cocoa Reference 2006-05-23
NSTableHeaderView Class Reference (HTML) (PDF)
Describes a column header of a table view.
Cocoa Reference 2006-05-23
NSTableView Class Reference (HTML) (PDF)
Describes a view that displays and manages tabular data.
Cocoa Reference
NSTabView Class Reference (HTML) (PDF)
Describes a view that supports switching between subviews.
Cocoa Reference 2006-05-23
NSTabViewItem Class Reference (HTML) (PDF)
Describes a single view in a tab view.
Cocoa Reference 2006-05-23
NSTask Class Reference (HTML) (PDF)
Describes a task that runs as a subprocess.
Cocoa Reference 2007-01-31
NSText Class Reference (HTML) (PDF)
Describes a basic interface for text-bearing objects.
Cocoa Reference 2008-05-06
NSTextAttachment Class Reference (HTML) (PDF)
Describes a text attachment for an attributed string.
Cocoa Reference 2006-05-23
NSTextAttachmentCell Class Reference (HTML) (PDF)
Describes the user interface for a text attachment.
Cocoa Reference 2006-05-23
NSTextAttachmentCell Protocol Reference (HTML) (PDF)
Describes the interface for drawing text attachments.
Cocoa Reference 2006-05-23
NSTextBlock Class Reference (HTML) (PDF)
Describes a block of text laid out in a subregion of a text container.
Cocoa Reference 2006-05-23
NSTextContainer Class Reference (HTML) (PDF)
Describes an area where text is laid out.
Cocoa Reference 2006-05-23
NSTextField Class Reference (HTML) (PDF)
Describes a control that displays editable text.
Cocoa Reference 2009-01-06
NSTextFieldCell Class Reference (HTML) (PDF)
Describes the user interface of a text field.
Cocoa Reference 2009-01-06
NSTextInput Protocol Reference (HTML) (PDF)
Descibes the formal protocol that text views implement to receive input from the user's keyboard and mouse.
Cocoa Reference 2006-05-23
NSTextInputClient Protocol Reference (HTML) (PDF)
Describes the interface for receiving keyboard input as properly formed text.
Cocoa Reference 2008-10-15
NSTextList Class Reference (HTML) (PDF)
Describes a section of text that forms a single list.
Cocoa Reference 2006-05-23
NSTextStorage Class Reference (HTML) (PDF)
Describes the text storage system.
Cocoa Reference 2006-05-23
NSTextTab Class Reference (HTML) (PDF)
Describes a tab in a paragraph style.
Cocoa Reference 2006-05-23
NSTextTable Class Reference (HTML) (PDF)
Describes a block of text that represents a table.
Cocoa Reference 2007-04-11
NSTextTableBlock Class Reference (HTML) (PDF)
Describes a block of text that appears as a cell within a table.
Cocoa Reference 2006-05-23
NSTextView Class Reference (HTML) (PDF)
Describes a view that displays editable text.
Cocoa Reference 2007-04-27
NSThread Class Reference (HTML) (PDF)
Describes a thread of execution.
Cocoa Reference 2007-12-11
NSTimer Class Reference (HTML) (PDF)
Describes a timer.
Cocoa Reference 2008-11-19
NSTimeZone Class Reference (HTML) (PDF)
Describes a time zone.
Cocoa Reference 2008-02-08
NSTokenField Class Reference (HTML) (PDF)
Describes a text field that provides tokenized editing.
Cocoa Reference 2008-10-15
NSTokenFieldCell Class Reference (HTML) (PDF)
Describes a cell used in the conversion of entered text into tokens representing objects.
Cocoa Reference 2007-03-05
NSToolbar Class Reference (HTML) (PDF)
Describes a toolbar in a window's title bar.
Cocoa Reference 2008-10-15
NSToolbarItem Class Reference (HTML) (PDF)
Describes a single item in a window's toolbar.
Cocoa Reference 2006-06-28
NSToolbarItemGroup Class Reference (HTML) (PDF)
Describes a group of items in a window's toolbar.
Cocoa Reference 2007-04-11
NSToolbarItemValidation Protocol Reference (HTML) (PDF)
Describes the interface for providing customized enabling and disabling of a toolbar item.
Cocoa Reference 2006-05-23
NSToolTipOwner Protocol Reference (HTML) (PDF)
Describes the interface for receiving requests for tooltip text.
Cocoa Reference 2006-05-23
NSTrackingArea Class Reference (HTML) (PDF)
Describes a view region used for mouse tracking and cursor updating.
Cocoa Reference 2007-03-09
NSTreeController Class Reference (HTML) (PDF)
Describes the class that is used with Cocoa bindings to manage a tree of objects.
Cocoa Reference 2007-04-10
NSTreeNode Class Reference (HTML) (PDF)
Describes a tree node in an object model.
Cocoa Reference 2006-07-13
NSTypesetter Class Reference (HTML) (PDF)
Describes the interface for typesetter objects that perform text line layout.
Cocoa Reference 2007-03-26
NSUnarchiver Class Reference (HTML) (PDF)
Describes an object that extracts the contents of an archive created by NSArchiver.
Cocoa Reference 2006-05-23
NSUndoManager Class Reference (HTML) (PDF)
Describes a general-purpose recorder of undo and redo operations.
Cocoa Reference 2007-01-18
NSUniqueIDSpecifier Class Reference (HTML) (PDF)
Describes the class used to specify an object in a container by unique ID.
Cocoa Reference 2006-05-23
NSURL Additions Reference (HTML) (PDF)
Describes additions to support pasteboards.
Cocoa Reference 2006-05-23
NSURL Class Reference (HTML) (PDF)
Describes a string that uniquely identifies a resource.
Cocoa Reference 2009-02-04
NSURLAuthenticationChallenge Class Reference (HTML) (PDF)
Describes a challenge from a server requiring authentication from the client.
Cocoa Reference 2006-05-23
NSURLAuthenticationChallengeSender Protocol Reference (HTML) (PDF)
Describes the interface for receiving authentication challenges.
Cocoa Reference 2006-05-23
NSURLCache Class Reference (HTML) (PDF)
Describes a collection of cached responses and data.
Cocoa Reference 2008-03-11
NSURLClient Protocol Reference (HTML) (PDF)
Deprecated - Describes the deprecated class replaced by the classes NSURLConnection and NSURLDownload.
Cocoa Reference 2006-08-01
NSURLConnection Class Reference (HTML) (PDF)
Describes the class that provides support for retrieving data from a server in response to a URL load request.
Cocoa Reference 2007-04-01
NSURLCredential Class Reference (HTML) (PDF)
Describes a credential used to authenticate a URL load request.
Cocoa Reference 2006-06-28
NSURLCredentialStorage Class Reference (HTML) (PDF)
Describes a mapping of credentials to their corresponding protection spaces.
Cocoa Reference 2006-05-23
NSURLDownload Class Reference (HTML) (PDF)
Describes a connection used to download data to a file.
Cocoa Reference 2006-05-23
NSURLHandle Class Reference (HTML) (PDF)
Describes a deprecated technology replaced by the NSURLDownload class.
Cocoa Reference 2009-02-04
NSURLHandleClient Protocol Reference (HTML) (PDF)
Describes a deprecated technology replaced by the NSURLDownload class.
Cocoa Reference 2006-05-23
NSURLProtectionSpace Class Reference (HTML) (PDF)
Describes an area on a server that requires authentication of URL load requests.
Cocoa Reference 2006-05-23
NSURLProtocol Class Reference (HTML) (PDF)
Describes the interface for protocol-specific loading of URL data.
Cocoa Reference 2007-04-01
NSURLProtocolClient Protocol Reference (HTML) (PDF)
Describes the interface used by protocol objects to communicate with the URL loading system.
Cocoa Reference 2006-05-23
NSURLRequest Class Reference (HTML) (PDF)
Describes a request for a resource identified by a URL.
Cocoa Reference 2007-04-01
NSURLResponse Class Reference (HTML) (PDF)
Describes the metadata returned by a server for a load request.
Cocoa Reference 2007-12-11
NSUserDefaults Class Reference (HTML) (PDF)
Describes an object for managing preference information.
Cocoa Reference 2009-04-08
NSUserDefaultsController Class Reference (HTML) (PDF)
Describes a Cocoa bindings-compatible manager for user preferences.
Cocoa Reference 2006-05-23
NSUserInterfaceValidations Protocol Reference (HTML) (PDF)
Describes the interface for participating in automatic enabling and disabling of controls.
Cocoa Reference 2006-05-23
NSValidatedUserInterfaceItem Protocol Reference (HTML) (PDF)
Describes the interface for a control to respond to requests regarding automatic enabling and disabling.
Cocoa Reference 2006-08-29
NSValue Class Reference (HTML) (PDF)
Describes a container for a single C or Objective-C data item.
Cocoa Reference 2007-10-31
NSValue Core Animation Additions (HTML) (PDF)
Describes extensions to Foundation's NSValue class that support the Core Animation LKTransform structure.
Cocoa Reference 2007-07-24
NSValueTransformer Class Reference (HTML) (PDF)
Describes a Cocoa-bindings compatible interface for transforming value representations.
Cocoa Reference 2007-07-24
NSView Class Reference (HTML) (PDF)
Describes the interface for drawing, event handling, and printing in views.
Cocoa Reference 2009-02-04
NSView Interface Builder Kit Additions Reference (HTML) (PDF)
Describes additions, used by Interface Builder plug-ins, for manipulating views.
Cocoa Reference 2007-05-10
NSViewAnimation Class Reference (HTML) (PDF)
Describes an animation in a view or window.
Cocoa Reference 2006-05-23
NSViewController Class Reference (HTML) (PDF)
Describes the manager of a view, usually a view stored in a nib file.
Cocoa Reference 2007-05-02
NSWhoseSpecifier Class Reference (HTML) (PDF)
Describes the class used to specify every object in a container that matches a defined condition.
Cocoa Reference 2006-06-28
NSWindow Class Reference (HTML) (PDF)
Describes a window.
Cocoa Reference 2009-03-04