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Leopard Reference
Cocoa is an object-oriented application environment designed for developing Mac OS X native applications. The Cocoa frameworks support rapid development and high productivity. Cocoa provides developers starting new Mac OS X projects the fastest way to full-featured implementations. Applications from other platforms can also be brought to Mac OS X quickly using Cocoa.

A guided introduction and learning path for developers new to Cocoa.   Essential information for developers using Objective-C.   Objective-C API references organized by framework.
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NSSplitView Class Reference (HTML) (PDF)
Describes a container for subviews with a user-controlled portion of each visible.
User Experience 2009-04-08
NSStatusBar Class Reference (HTML) (PDF)
Describes the collection of status items in the menu bar.
User Experience 2007-03-05
NSStatusItem Class Reference (HTML) (PDF)
Describes a status item in the menu bar.
User Experience 2007-03-05
NSStepper Class Reference (HTML) (PDF)
Describes a control that can increment and decrement a value.
User Experience 2006-05-23
NSStepperCell Class Reference (HTML) (PDF)
Describes an action cell that provides appearance and behavior for an NSStepper object.
User Experience 2006-05-23
NSStream Class Reference (HTML) (PDF)
Describes an interface for reading and writing data.
Data Management, File Management, Networking 2008-10-15
NSString Application Kit Additions Reference (HTML) (PDF)
Describes additions for drawing strings.
Data Management, Text & Fonts 2009-02-04
NSString Class Reference (HTML) (PDF)
Describes an immutable character string.
Data Management 2009-02-04
NSTableColumn Class Reference (HTML) (PDF)
Describes the display characteristics and attribute identifiers for a column in a table view.
User Experience 2007-10-31
NSTableDataSource Protocol Reference (HTML) (PDF)
Describes the interface for receiving table view data requests.
User Experience 2007-04-10
NSTableHeaderCell Class Reference (HTML) (PDF)
Describes the user interface of a column header of a table view.
User Experience 2006-05-23
NSTableHeaderView Class Reference (HTML) (PDF)
Describes a column header of a table view.
User Experience 2006-05-23
NSTableView Class Reference (HTML) (PDF)
Describes a view that displays and manages tabular data.
User Experience
NSTabView Class Reference (HTML) (PDF)
Describes a view that supports switching between subviews.
User Experience 2006-05-23
NSTabViewItem Class Reference (HTML) (PDF)
Describes a single view in a tab view.
User Experience 2006-05-23
NSTask Class Reference (HTML) (PDF)
Describes a task that runs as a subprocess.
Process Management 2007-01-31
NSText Class Reference (HTML) (PDF)
Describes a basic interface for text-bearing objects.
Text & Fonts 2008-05-06
NSTextAttachment Class Reference (HTML) (PDF)
Describes a text attachment for an attributed string.
Text & Fonts 2006-05-23
NSTextAttachmentCell Class Reference (HTML) (PDF)
Describes the user interface for a text attachment.
Text & Fonts 2006-05-23
NSTextAttachmentCell Protocol Reference (HTML) (PDF)
Describes the interface for drawing text attachments.
Objective-C Language 2006-05-23
NSTextBlock Class Reference (HTML) (PDF)
Describes a block of text laid out in a subregion of a text container.
Text & Fonts 2006-05-23
NSTextContainer Class Reference (HTML) (PDF)
Describes an area where text is laid out.
Text & Fonts 2006-05-23
NSTextField Class Reference (HTML) (PDF)
Describes a control that displays editable text.
User Experience 2009-01-06
NSTextFieldCell Class Reference (HTML) (PDF)
Describes the user interface of a text field.
User Experience 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.
Events & Other Input, Text & Fonts 2006-05-23
NSTextInputClient Protocol Reference (HTML) (PDF)
Describes the interface for receiving keyboard input as properly formed text.
Events & Other Input, Text & Fonts 2008-10-15
NSTextList Class Reference (HTML) (PDF)
Describes a section of text that forms a single list.
Text & Fonts 2006-05-23
NSTextStorage Class Reference (HTML) (PDF)
Describes the text storage system.
Text & Fonts 2006-05-23
NSTextTab Class Reference (HTML) (PDF)
Describes a tab in a paragraph style.
Text & Fonts 2006-05-23
NSTextTable Class Reference (HTML) (PDF)
Describes a block of text that represents a table.
Text & Fonts 2007-04-11
NSTextTableBlock Class Reference (HTML) (PDF)
Describes a block of text that appears as a cell within a table.
Text & Fonts 2006-05-23
NSTextView Class Reference (HTML) (PDF)
Describes a view that displays editable text.
Text & Fonts 2007-04-27
NSThread Class Reference (HTML) (PDF)
Describes a thread of execution.
Process Management 2007-12-11
NSTimer Class Reference (HTML) (PDF)
Describes a timer.
Events & Other Input 2008-11-19
NSTimeZone Class Reference (HTML) (PDF)
Describes a time zone.
Data Management, Internationalization 2008-02-08
NSTokenField Class Reference (HTML) (PDF)
Describes a text field that provides tokenized editing.
User Experience 2008-10-15
NSTokenFieldCell Class Reference (HTML) (PDF)
Describes a cell used in the conversion of entered text into tokens representing objects.
User Experience 2007-03-05
NSToolbar Class Reference (HTML) (PDF)
Describes a toolbar in a window's title bar.
User Experience 2008-10-15
NSToolbarItem Class Reference (HTML) (PDF)
Describes a single item in a window's toolbar.
User Experience 2006-06-28
NSToolbarItemGroup Class Reference (HTML) (PDF)
Describes a group of items in a window's toolbar.
User Experience 2007-04-11
NSToolbarItemValidation Protocol Reference (HTML) (PDF)
Describes the interface for providing customized enabling and disabling of a toolbar item.
User Experience 2006-05-23
NSToolTipOwner Protocol Reference (HTML) (PDF)
Describes the interface for receiving requests for tooltip text.
User Experience 2006-05-23
NSTrackingArea Class Reference (HTML) (PDF)
Describes a view region used for mouse tracking and cursor updating.
Events & Other Input 2007-03-09
NSTreeController Class Reference (HTML) (PDF)
Describes the class that is used with Cocoa bindings to manage a tree of objects.
Data Management, Design Guidelines 2007-04-10
NSTreeNode Class Reference (HTML) (PDF)
Describes a tree node in an object model.
Data Management 2006-07-13
NSTypesetter Class Reference (HTML) (PDF)
Describes the interface for typesetter objects that perform text line layout.
Text & Fonts 2007-03-26
NSUnarchiver Class Reference (HTML) (PDF)
Describes an object that extracts the contents of an archive created by NSArchiver.
Data Management 2006-05-23
NSUndoManager Class Reference (HTML) (PDF)
Describes a general-purpose recorder of undo and redo operations.
Data Management 2007-01-18
NSUniqueIDSpecifier Class Reference (HTML) (PDF)
Describes the class used to specify an object in a container by unique ID.
Scripting & Automation 2006-05-23
NSURL Additions Reference (HTML) (PDF)
Describes additions to support pasteboards.
Internet & Web, Networking 2006-05-23
NSURL Class Reference (HTML) (PDF)
Describes a string that uniquely identifies a resource.
Internet & Web, Networking 2009-02-04
NSURLAuthenticationChallenge Class Reference (HTML) (PDF)
Describes a challenge from a server requiring authentication from the client.
Internet & Web, Networking 2006-05-23
NSURLAuthenticationChallengeSender Protocol Reference (HTML) (PDF)
Describes the interface for receiving authentication challenges.
Internet & Web, Networking 2006-05-23
NSURLCache Class Reference (HTML) (PDF)
Describes a collection of cached responses and data.
Internet & Web, Networking 2008-03-11
NSURLClient Protocol Reference (HTML) (PDF)
Deprecated - Describes the deprecated class replaced by the classes NSURLConnection and NSURLDownload.
Internet & Web, Networking 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.
Internet & Web, Networking 2007-04-01
NSURLCredential Class Reference (HTML) (PDF)
Describes a credential used to authenticate a URL load request.
Internet & Web, Networking 2006-06-28
NSURLCredentialStorage Class Reference (HTML) (PDF)
Describes a mapping of credentials to their corresponding protection spaces.
Internet & Web, Networking 2006-05-23
NSURLDownload Class Reference (HTML) (PDF)
Describes a connection used to download data to a file.
Internet & Web, Networking 2006-05-23
NSURLHandle Class Reference (HTML) (PDF)
Describes a deprecated technology replaced by the NSURLDownload class.
Internet & Web, Networking 2009-02-04
NSURLHandleClient Protocol Reference (HTML) (PDF)
Describes a deprecated technology replaced by the NSURLDownload class.
Internet & Web, Networking 2006-05-23
NSURLProtectionSpace Class Reference (HTML) (PDF)
Describes an area on a server that requires authentication of URL load requests.
Internet & Web, Networking 2006-05-23
NSURLProtocol Class Reference (HTML) (PDF)
Describes the interface for protocol-specific loading of URL data.
Internet & Web, Networking 2007-04-01
NSURLProtocolClient Protocol Reference (HTML) (PDF)
Describes the interface used by protocol objects to communicate with the URL loading system.
Internet & Web, Networking 2006-05-23
NSURLRequest Class Reference (HTML) (PDF)
Describes a request for a resource identified by a URL.
Internet & Web, Networking 2007-04-01
NSURLResponse Class Reference (HTML) (PDF)
Describes the metadata returned by a server for a load request.
Internet & Web, Networking, Objective-C Language 2007-12-11
NSUserDefaults Class Reference (HTML) (PDF)
Describes an object for managing preference information.
Data Management, User Experience 2009-04-08
NSUserDefaultsController Class Reference (HTML) (PDF)
Describes a Cocoa bindings-compatible manager for user preferences.
Data Management 2006-05-23
NSUserInterfaceValidations Protocol Reference (HTML) (PDF)
Describes the interface for participating in automatic enabling and disabling of controls.
User Experience 2006-05-23
NSValidatedUserInterfaceItem Protocol Reference (HTML) (PDF)
Describes the interface for a control to respond to requests regarding automatic enabling and disabling.
Objective-C Language 2006-08-29
NSValue Class Reference (HTML) (PDF)
Describes a container for a single C or Objective-C data item.
Data Management 2007-10-31
NSValue Core Animation Additions (HTML) (PDF)
Describes extensions to Foundation's NSValue class that support the Core Animation LKTransform structure.
Graphics & Imaging 2007-07-24
NSValueTransformer Class Reference (HTML) (PDF)
Describes a Cocoa-bindings compatible interface for transforming value representations.
Data Management, Design Guidelines 2007-07-24
NSView Class Reference (HTML) (PDF)
Describes the interface for drawing, event handling, and printing in views.
Events & Other Input, Graphics & Imaging, Printing 2009-02-04
NSView Interface Builder Kit Additions Reference (HTML) (PDF)
Describes additions, used by Interface Builder plug-ins, for manipulating views.
Tools 2007-05-10
NSViewAnimation Class Reference (HTML) (PDF)
Describes an animation in a view or window.
Graphics & Imaging, User Experience 2006-05-23
NSViewController Class Reference (HTML) (PDF)
Describes the manager of a view, usually a view stored in a nib file.
Graphics & Imaging, User Experience 2007-05-02
NSWhoseSpecifier Class Reference (HTML) (PDF)
Describes the class used to specify every object in a container that matches a defined condition.
Scripting & Automation 2006-06-28
NSWindow Class Reference (HTML) (PDF)
Describes a window.
Events & Other Input, Graphics & Imaging, User Experience 2009-03-04
NSWindowController Class Reference (HTML) (PDF)
Describes an object for controlling a window that is usually stored in a nib file.
Design Guidelines 2006-05-23
NSWindowScripting Protocol Reference (HTML) (PDF)
Describes the category on NSWindow for scripting basic properties and commands of windows in scriptable applications.
Scripting & Automation, User Experience 2006-05-23
NSWorkspace Class Reference (HTML) (PDF)
Describes an object that provides Finder services to an application.
Interapplication Communication 2007-04-27
NSXMLDocument Class Reference (HTML) (PDF)
Describes the class for representing XML documents as a logical tree structure.
Data Management 2007-02-27
NSXMLDTD Class Reference (HTML) (PDF)
Describes a representation of a Document Type Definition as a tree structure.
Data Management 2007-02-27
NSXMLDTDNode Class Reference (HTML) (PDF)
Describes a declaration node for a Document Type Definition.
Data Management 2007-02-27
NSXMLElement Class Reference (HTML) (PDF)
Describes an element node in an XML tree structure.
Data Management 2007-02-27
NSXMLNode Class Reference (HTML) (PDF)
Describes a logical node in an XML tree structure.
Data Management 2007-02-27
NSXMLParser Class Reference (HTML) (PDF)
Describes an object for finding and extracting data in XML documents.
Data Management 2007-02-02
Objective-C 1 Runtime Reference (HTML) (PDF)
Deprecated - Describes the data structures and functions of the Objective-C 1.0 runtime support library.
Objective-C Language 2009-01-06
Objective-C 2.0 Runtime Reference (HTML) (PDF)
Describes the data structures and functions of the Objective-C runtime support library.
Objective-C Language 2008-11-19
PDEPanel Protocol Reference (HTML) (PDF)
Describes the informal protocol used to implement custom panes in a printing dialog.
Printing 2007-12-11
PDEPlugIn Protocol Reference (HTML) (PDF)
Describes the informal protocol used to add custom panes to a printing dialog.
Printing 2007-12-11
PDEPlugInCallbackProtocol Reference (HTML) (PDF)
Describes the informal protocol used to access information about the current print job.
Printing 2007-12-11
PDF Kit Reference Collection (HTML) (PDF)
Describes the Objective-C API for viewing, navigating, and editing PDF content.
Graphics & Imaging 2007-12-11
PDFAction Class Reference (HTML) (PDF)
Describes the class for representing an action in a PDF document.
Graphics & Imaging 2007-12-11
PDFActionGoTo Class Reference (HTML) (PDF)
Describes the class for manipulating the destination of a go-to action in a PDF document.
Graphics & Imaging 2007-12-11
PDFActionNamed Class Reference (HTML) (PDF)
Describes the class for working with actions that have defined names, such as "Go back."
Graphics & Imaging 2007-12-11
PDFActionRemoteGoTo Class Reference (HTML) (PDF)
Describes the class for manipulating the destination of a go-to action that targets another PDF document.
Graphics & Imaging 2007-12-11
PDFActionResetForm Class Reference (HTML) (PDF)
Describes the class for getting and clearing fields in a PDF form.
Graphics & Imaging 2007-12-11
PDFActionURL Class Reference (HTML) (PDF)
Describes the class for managing the URL associated with a URL action.
Graphics & Imaging 2007-12-11