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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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NSOutlineView Class Reference (HTML) (PDF)
Describes a row-and-column format view for displaying hierarchical data.
User Experience 2009-02-04
NSOutlineViewDataSource Protocol Reference (HTML) (PDF)
Describes the interface used by an outline view to retrieve data and, optionally, to update data values.
User Experience 2007-02-19
NSPanel Class Reference (HTML) (PDF)
Describes a window for performing auxiliary functions in an application.
User Experience 2009-01-06
NSPasteboard Class Reference (HTML) (PDF)
Describes a pasteboard.
User Experience 2008-10-15
NSPathCell Class Reference (HTML) (PDF)
Describes the user interface of a path control object.
User Experience 2007-04-11
NSPathCellDelegate Protocol Reference (HTML) (PDF)
Describes the interface used to customize a pop-up-style control that represents a path.
User Experience 2007-04-11
NSPathComponentCell Class Reference (HTML) (PDF)
Describes a component of a path control.
User Experience 2007-04-11
NSPathControl Class Reference (HTML) (PDF)
Describes a control representing a file path or virtual path.
User Experience 2007-04-11
NSPathControlDelegate Protocol Reference (HTML) (PDF)
Describes the interface used to support dragging and pop-up menu customization in path controls.
User Experience 2007-04-11
NSPopUpButton Class Reference (HTML) (PDF)
Describes a control for displaying pull-down or pop-up lists of items.
User Experience 2008-10-15
NSPopUpButtonCell Class Reference (HTML) (PDF)
Describes a cell used in the display of pull-down or pop-up menus.
User Experience 2008-10-15
NSPredicateEditor Class Reference (HTML) (PDF)
Describes a graphical predicate editor.
User Experience 2008-10-15
NSPredicateEditorRowTemplate Class Reference (HTML) (PDF)
Describes a row in a graphical predicate editor.
User Experience 2007-01-12
NSPreferencePane Class Reference (HTML) (PDF)
Defines the interface for subclasses to provide preference panes to System Preferences or other applications.
User Experience 2006-05-23
NSPrintPanelAccessorizing Protocol Reference (HTML) (PDF)
Describes the interface for configuring accessory panes for the print panel.
User Experience 2007-03-09
NSProgressIndicator Class Reference (HTML) (PDF)
Describes a control that shows that a lengthy task is under way.
User Experience 2008-03-11
NSRuleEditor Class Reference (HTML) (PDF)
Describes a graphical rule editor.
User Experience 2008-02-08
NSSavePanel Class Reference (HTML) (PDF)
Describes the panel that a user employs to set a file-system location and save a file.
User Experience 2009-02-04
NSScroller Class Reference (HTML) (PDF)
Describes a control for scrolling a document view within a scroll view.
User Experience 2009-04-08
NSScrollView Class Reference (HTML) (PDF)
Describes a view for displaying content larger than its bounds.
User Experience 2006-05-23
NSSearchField Class Reference (HTML) (PDF)
Describes a text field optimized for entering a search query.
User Experience 2006-05-23
NSSearchFieldCell Class Reference (HTML) (PDF)
Describes a search field cell.
User Experience 2008-03-11
NSSecureTextField Class Reference (HTML) (PDF)
Describes a text field that hides its text.
User Experience 2006-05-23
NSSecureTextFieldCell Class Reference (HTML) (PDF)
Describes the user interface of a secure text field.
User Experience 2007-10-31
NSSegmentedCell Class Reference (HTML) (PDF)
Describes an action cell that provides appearance and behavior for an NSSegmentedControl object.
User Experience 2009-05-06
NSSegmentedControl Class Reference (HTML) (PDF)
Describes a horizontal button divided into multiple segments
User Experience 2009-05-06
NSSlider Class Reference (HTML) (PDF)
Describes a control for selecting a value from a continuous range of values.
User Experience 2006-05-23
NSSliderCell Class Reference (HTML) (PDF)
Describes an action cell that provides appearance and behavior for an NSSlider object.
User Experience 2006-05-23
NSSpeechRecognizer Class Reference (HTML) (PDF)
Describes the Cocoa command-and-control voice recognition system.
User Experience 2007-04-03
NSSpeechSynthesizer Class Reference (HTML) (PDF)
Describes the Cocoa parser that converts text to speech.
User Experience 2009-01-06
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
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
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
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
NSUserDefaults Class Reference (HTML) (PDF)
Describes an object for managing preference information.
User Experience 2009-04-08
NSUserInterfaceValidations Protocol Reference (HTML) (PDF)
Describes the interface for participating in automatic enabling and disabling of controls.
User Experience 2006-05-23
NSViewAnimation Class Reference (HTML) (PDF)
Describes an animation in a view or window.
User Experience 2006-05-23
NSViewController Class Reference (HTML) (PDF)
Describes the manager of a view, usually a view stored in a nib file.
User Experience 2007-05-02
NSWindow Class Reference (HTML) (PDF)
Describes a window.
User Experience 2009-03-04
NSWindowScripting Protocol Reference (HTML) (PDF)
Describes the category on NSWindow for scripting basic properties and commands of windows in scriptable applications.
User Experience 2006-05-23
Preference Panes Framework Reference (HTML) (PDF)
Describes the Objective-C API for supporting and working with preference panes.
User Experience 2006-05-23
QLPreviewRequest Reference (HTML) (PDF)
Describes an opaque type for handling requests for Quick Look document previews.
User Experience 2007-04-20
QLThumbnailRequest Reference (HTML) (PDF)
Describes an opaque type for handling requests for Quick Look thumbnail images.
User Experience 2007-10-31
Quick Look Framework Reference (HTML) (PDF)
Describes the interface for creating plug-ins that generate Quick Look previews and thumbnails.
User Experience 2007-04-13
Screen Saver Framework Reference (HTML) (PDF)
Describes the Objective-C API for supporting and working with screen effects.
User Experience 2006-05-23
Screen Saver Functions Reference (HTML) (PDF)
Describes functions and function-like macros available in the Screen Saver framework.
User Experience 2006-05-23
ScreenSaverDefaults Class Reference (HTML) (PDF)
Describes the class that defines a set of methods for saving and restoring user defaults for screen savers.
User Experience 2006-05-23
ScreenSaverView Class Reference (HTML) (PDF)
Describes the class that defines the interface for subclassers to interact with the screen saver infrastructure.
User Experience 2006-05-23
Search Kit Reference (HTML) (PDF)
Describes the interface for supporting user searches of textual content.
User Experience 2009-05-06
WebArchive Class Reference (HTML) (PDF)
Describes the class for archiving a web page and all of its related resources.
User Experience 2009-04-08
WebBackForwardList Class Reference (HTML) (PDF)
Describes the class for tracking a list of visited pages with relation to the most recent page.
User Experience 2009-02-04
WebDataSource Class Reference (HTML) (PDF)
Describes the class for encapsulating web content for display in a web frame view.
User Experience 2008-10-15
WebDocumentRepresentation Protocol Reference (HTML) (PDF)
Describes the protocol adopted by document representation classes that handle specific MIME types.
User Experience 2006-05-23
WebDocumentSearching Protocol Reference (HTML) (PDF)
Describes the protocol adopted by document view objects to support searching.
User Experience 2006-05-23
WebDocumentText Protocol Reference (HTML) (PDF)
Describes the protocol adopted by document view objects to support working with text.
User Experience 2009-03-04
WebDocumentView Protocol Reference (HTML) (PDF)
Describes the protocol adopted by document view objects to display data of different MIME types.
User Experience 2008-10-15
WebDownload Class Reference (HTML) (PDF)
Describes the class for providing an authentication sheet before a download begins.
User Experience 2008-10-15
WebEditingDelegate Protocol Reference (HTML) (PDF)
Describes the protocol adopted by WebView objects to change the view's default editing behavior.
User Experience 2009-04-08
WebFrame Class Reference (HTML) (PDF)
Describes the class for encapsulating the data displayed within a WebFrameView object.
User Experience 2009-04-08
WebFrameLoadDelegate Protocol Reference (HTML) (PDF)
Describes the protocol adopted by WebView frame load delegates to be notified while frame loads are in progress.
User Experience 2009-04-08
WebFrameView Class Reference (HTML) (PDF)
Describes the class for displaying the actual web content contained in a frame.
User Experience 2009-03-04
WebHistory Class Reference (HTML) (PDF)
Describes the class for maintaining a set of pages visited by users.
User Experience 2009-03-04
WebHistoryItem Class Reference (HTML) (PDF)
Describes the class for encapsulating information about a visited page.
User Experience 2008-10-15
WebJavaPlugIn Protocol Reference (HTML) (PDF)
Describes the protocol for running Java applets from within a WebView.
User Experience 2009-04-08
WebKit Constants Reference (HTML) (PDF)
Describes the types and constants found in the WebKit framework.
User Experience 2008-10-15
WebKit Objective-C Framework Reference (HTML) (PDF)
Describes the Objective-C API used to display web content in windows.
User Experience 2008-10-15
WebOpenPanelResultListener Protocol Reference (HTML) (PDF)
Describes the protocol adopted by WebView delegates to communicate with an Open dialog.
User Experience 2009-04-08
WebPlugIn Protocol Reference (HTML) (PDF)
Describes the protocol adopted by an application using the Web Kit and any Web Kit-based plug-ins.
User Experience 2009-04-08
WebPlugInContainer Protocol Reference (HTML) (PDF)
Describes the protocol that enables a plug-in to send messages to an application.
User Experience 2009-04-08
WebPlugInViewFactory Protocol Reference (HTML) (PDF)
Describes the protocol used to create an NSView object for a plug-in.
User Experience 2009-04-08
WebPolicyDecisionListener Protocol Reference (HTML) (PDF)
Describes the protocol for handling download decisions asynchronously.
User Experience 2009-03-04
WebPolicyDelegate Protocol Reference (HTML) (PDF)
Describes the protocol used to modify the policy decisions that are made when handling URLs or the data they represent.
User Experience 2009-04-08
WebPreferences Class Reference (HTML) (PDF)
Describes the class for the preferences you can change per WebView object, such as font, text encoding, and image settings.
User Experience 2008-10-15
WebResource Class Reference (HTML) (PDF)
Describes the class for downloaded data and its related properties, such as its URL and MIME type.
User Experience 2009-04-08
WebResourceLoadDelegate Protocol Reference (HTML) (PDF)
Describes the protocol used to be notified on the progress of loading individual resources.
User Experience 2008-06-19
WebScripting Protocol Reference (HTML) (PDF)
Describes the protocol that defines methods that classes can implement to expose their interfaces to a WebScript environment.
User Experience 2009-04-08
WebScriptObject Class Reference (HTML) (PDF)
Describes the class for bridging a web view's scripting environment and the Objective-C runtime.
User Experience 2009-04-08
WebUIDelegate Protocol Reference (HTML) (PDF)
Describes the protocol used to control user interface-related aspects, such as opening windows and augmenting default menus.
User Experience 2009-03-04
WebUndefined Class Reference (HTML) (PDF)
Describes the class used to represent the JavaScript "undefined" value.
User Experience 2006-05-23
WebView Class Reference (HTML) (PDF)
Describes the class for embedding web content in a window.
User Experience 2009-04-08