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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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NSMutableAttributedString Class Reference (HTML) (PDF)
Describes a mutable character string with attributes.
Text & Fonts 2006-06-28
NSMutableParagraphStyle Class Reference (HTML) (PDF)
Describes a mutable paragraph style.
Text & Fonts 2008-10-15
NSParagraphStyle Class Reference (HTML) (PDF)
Describes an immutable paragraph style.
Text & Fonts 2006-05-23
NSRulerMarker Class Objective-C Reference (HTML) (PDF)
Describes a marker on a ruler, such as a tab setting.
Text & Fonts 2006-05-23
NSRulerView Class Reference (HTML) (PDF)
Describes a ruler, with markers, that adjoins a scroll view's document view.
Text & Fonts 2006-05-23
NSSecureTextField Class Reference (HTML) (PDF)
Describes a text field that hides its text.
Text & Fonts 2006-05-23
NSSecureTextFieldCell Class Reference (HTML) (PDF)
Describes the user interface of a secure text field.
Text & Fonts 2007-10-31
NSSimpleHorizontalTypesetter Class Reference (HTML) (PDF)
Deprecated - Describes the deprecated technology replaced by NSATSTypesetter.
Text & Fonts 2006-05-23
NSSpeechSynthesizer Class Reference (HTML) (PDF)
Describes the Cocoa parser that converts text to speech.
Text & Fonts 2009-01-06
NSSpellChecker Class Reference (HTML) (PDF)
Describes the interface to the Cocoa spell-checking service.
Text & Fonts 2007-04-27
NSSpellServer Class Reference (HTML) (PDF)
Describes an application-defined spell-checking service.
Text & Fonts 2007-04-27
NSString Application Kit Additions Reference (HTML) (PDF)
Describes additions for drawing strings.
Text & Fonts 2009-02-04
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
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
NSTextInput Protocol Reference (HTML) (PDF)
Descibes the formal protocol that text views implement to receive input from the user's keyboard and mouse.
Text & Fonts 2006-05-23
NSTextInputClient Protocol Reference (HTML) (PDF)
Describes the interface for receiving keyboard input as properly formed text.
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
NSTypesetter Class Reference (HTML) (PDF)
Describes the interface for typesetter objects that perform text line layout.
Text & Fonts 2007-03-26
Search Kit Reference (HTML) (PDF)
Describes the interface for supporting user searches of textual content.
Text & Fonts 2009-05-06
AppleScript Studio Terminology Reference (HTML) (PDF)
Describes the scripting terminology for AppleScript Studio, through version 1.4.
Tools 2007-10-31
IBDocument Class Reference (HTML) (PDF)
Describes an Interface Builder document, which visually represents a nib file.
Tools 2009-01-06
IBInspector Class Reference (HTML) (PDF)
Describes the interface for managing inspector views in Interface Builder.
Tools 2007-07-11
IBPlugin Class Reference (HTML) (PDF)
Describes the interface for managing plug-ins in Interface Builder.
Tools 2007-04-02
Interface Builder Kit Constants Reference (HTML) (PDF)
Describes the constants declared in the Interface Builder Kit framework.
Tools 2007-04-02
Interface Builder Kit Data Types Reference (HTML) (PDF)
Describes the data types declared in the Interface Builder Kit framework.
Tools 2007-04-02
Interface Builder Kit Framework Reference (HTML) (PDF)
Describes the interface for implementing Interface Builder plug-ins.
Tools 2007-04-18
NSObject Interface Builder Kit Additions Reference (HTML) (PDF)
Describes additions, used by Interface Builder plug-ins, for inspecting objects.
Tools 2007-05-10
NSView Interface Builder Kit Additions Reference (HTML) (PDF)
Describes additions, used by Interface Builder plug-ins, for manipulating views.
Tools 2007-05-10
Application Kit Framework Reference (HTML) (PDF)
Describes the interface for all things related to an application's user interface.
User Experience 2008-11-19
Cocoa Bindings Reference (HTML) (PDF)
Describes the exposed bindings of Cocoa classes.
User Experience 2007-10-31
Disc Recording UI Framework Reference (HTML)
Describes the Objective-C and C API for presenting a user interface when burning audio and data CDs and DVDs.
User Experience 2008-04-08
DOMDocument Additions Reference (HTML) (PDF)
Describes the API added to the DOMDocument class to facilitate communication between WebKit and the DOM API.
User Experience 2008-10-15
DOMElement Additions Reference (HTML)
Describes the API added to the DOMElement class to facilitate communication between WebKit and the DOM API.
User Experience 2008-10-15
DOMHTMLDocument Additions Reference (HTML) (PDF)
Describes the API added to the DOMHTMLDocument class to facilitate communication between WebKit and the DOM API.
User Experience 2009-01-26
DOMHTMLFrameElement Additions Reference (HTML) (PDF)
Describes the API added to the DOMHTMLFrameElement class to facilitate communication between WebKit and the DOM API.
User Experience 2006-05-23
DOMHTMLIFrameElement Additions Reference (HTML) (PDF)
Describes the API added to the DOMHTMLIFrameElement class to facilitate communication between WebKit and the DOM API.
User Experience 2006-05-23
DOMHTMLObjectElement Additions Reference (HTML) (PDF)
Describes the API added to the DOMHTMLObjectElement class to facilitate communication between WebKit and the DOM API.
User Experience 2006-05-23
DOMNode Additions Reference (HTML) (PDF)
Describes the API added to the DOMNode class to facilitate communication between WebKit and the DOM API.
User Experience 2009-02-04
DOMRange Additions Reference (HTML) (PDF)
Describes the API added to the DOMRange class to facilitate communication between WebKit and the DOM API.
User Experience 2008-10-15
Find By Content Reference (HTML) (PDF)
Deprecated - Describes the legacy C API for performing relevance-ranked searches. Replaced by Search Kit.
User Experience 2006-07-13
NSActionCell Class Reference (HTML) (PDF)
Describes the interface for the active area in a control.
User Experience 2007-02-28
NSAlert Class Reference (HTML) (PDF)
Describes a window that displays a message and obtains the user's response to it.
User Experience 2007-04-25
NSAnimation Class Reference (HTML) (PDF)
Describes the behavior of an animation.
User Experience 2007-10-31
NSBox Class Reference (HTML) (PDF)
Describes a view that can display its border and a title.
User Experience 2008-10-15
NSBrowser Class Reference (HTML) (PDF)
Describes a control for manipulating one- or two-dimensional data sets.
User Experience 2007-04-05
NSBrowserCell Class Reference (HTML) (PDF)
Describes a cell that displays data in a browser.
User Experience 2007-04-01
NSButton Class Reference (HTML) (PDF)
Describes a control that responds to clicks.
User Experience 2007-04-01
NSButtonCell Class Reference (HTML) (PDF)
Describes a cell that responds to mouse clicks.
User Experience 2009-04-08
NSCell Class Reference (HTML) (PDF)
Describes the interface for cell objects.
User Experience 2009-02-04
NSCollectionView Class Reference (HTML) (PDF)
Describes a collection of views that displays content in a grid.
User Experience 2007-12-11
NSCollectionViewItem Class Reference (HTML) (PDF)
Describes a controller that mediates between a prototype view and a model object.
User Experience 2006-12-28
NSColorPicker Class Reference (HTML) (PDF)
Describes the interface for custom views in a color panel used for color selection.
User Experience 2007-02-28
NSColorPickingCustom Protocol Reference (HTML) (PDF)
Describes the interface for receiving custom color-picker user-interface requests.
User Experience 2007-04-01
NSColorPickingDefault Protocol Reference (HTML) (PDF)
Describes the interface for receiving basic color-picker user-interface requests.
User Experience 2007-04-27
NSColorWell Class Reference (HTML) (PDF)
Describes a control for displaying and selecting colors.
User Experience 2007-02-28
NSComboBox Class Reference (HTML) (PDF)
Describes a control for entering text or selecting from a pop-up list of items.
User Experience 2006-05-23
NSComboBoxCell Class Reference (HTML) (PDF)
Describes the text field that provides the user interface for NSComboBox objects.
User Experience 2006-05-23
NSComboBoxCellDataSource Protocol Reference (HTML) (PDF)
Describes the interface for receiving data requests from an NSComboBoxCell object.
User Experience 2006-05-23
NSComboBoxDataSource Protocol Reference (HTML) (PDF)
Describes the interface for receiving data requests from an NSComboBox object.
User Experience 2006-05-23
NSControl Class Reference (HTML) (PDF)
Describes the interface for views that respond to user actions by sending action messages.
User Experience 2008-10-15
NSCursor Class Reference (HTML) (PDF)
Describes the appearance of the user interface cursor.
User Experience 2009-01-06
NSDateFormatter Class Reference (HTML) (PDF)
Describes a date formatter.
User Experience 2008-11-19
NSDatePicker Class Reference (HTML) (PDF)
Describes a control for displaying and editing a date.
User Experience 2008-06-09
NSDatePickerCell Class Reference (HTML) (PDF)
Describes a cell for displaying and editing a date.
User Experience 2008-06-09
NSDockTile Class Reference (HTML) (PDF)
Describes the interface for customizing an application's dock tiles
User Experience 2009-03-04
NSDrawer Class Reference (HTML) (PDF)
Describes a retractable user interface element that displays view objects.
User Experience 2006-05-23
NSErrorRecoveryAttempting Protocol Reference (HTML) (PDF)
Describes the interface for attempting recovery from runtime errors.
User Experience 2007-02-23
NSFontPanel Class Reference (HTML) (PDF)
Describes the panel for font selection.
User Experience 2007-04-06
NSFontPanelValidation Protocol Reference (HTML) (PDF)
Describes the interface for validating fonts.
User Experience 2007-04-06
NSForm Class Reference (HTML) (PDF)
Describes a vertical matrix of NSFormCell objects.
User Experience 2006-05-23
NSFormatter Class Reference (HTML) (PDF)
Describes the interface for formatter objects.
User Experience 2007-07-09
NSFormCell Class Reference (HTML) (PDF)
Describes a title and text entry field in an NSForm object.
User Experience 2006-05-23
NSHelpManager Class Reference (HTML) (PDF)
Describes an application-level help system.
User Experience 2009-02-04
NSImageCell Class Reference (HTML) (PDF)
Describes an object that displays an image in a frame, usually in a control.
User Experience 2009-01-06
NSImageView Class Reference (HTML) (PDF)
Describes a view that displays an image.
User Experience 2007-01-22
NSInputManager Class Reference (HTML) (PDF)
Describes the class used by text views to communicate with the text input management system.
User Experience 2007-04-01
NSInputServer Class Reference (HTML) (PDF)
Describes the class that interprets text view events and communicates them to the text input management system.
User Experience 2007-04-01
NSInputServerMouseTracker Protocol Reference (HTML) (PDF)
Describes the protocol implemented by text input servers to handle mouse events.
User Experience 2007-04-02
NSInputServiceProvider Protocol Reference (HTML) (PDF)
Describes the protocol implemented by text input servers to handle application and text field events.
User Experience 2007-04-02
NSLevelIndicator Class Reference (HTML) (PDF)
Describes a control for displaying a rank or amount along a linear scale.
User Experience 2007-03-01
NSLevelIndicatorCell Class Reference (HTML) (PDF)
Describes a cell used for displaying a rank or amount along a linear scale.
User Experience 2007-03-01
NSLocale Class Reference (HTML) (PDF)
Describes a locale.
User Experience 2008-02-08
NSMatrix Class Reference (HTML) (PDF)
Describes a group of cell objects that work together in various ways.
User Experience 2008-10-15
NSMenu Class Reference (HTML) (PDF)
Describes an application menu.
User Experience 2008-02-08
NSMenuItem Class Reference (HTML) (PDF)
Describes a menu item.
User Experience 2008-02-08
NSMenuItem Protocol Reference (HTML) (PDF)
Deprecated - Describes a deprecated protocol replaced by the NSMenuItem class.
User Experience 2007-02-08
NSMenuItemCell Class Reference (HTML) (PDF)
Describes a deprecated class replaced by the NSMenuItem class.
User Experience 2007-03-07
NSMenuValidation Protocol Reference (HTML) (PDF)
Describes the interface for enabling and disabling menu items.
User Experience 2007-03-02
NSMenuView Class Reference (HTML) (PDF)
Describes a deprecated class replaced by the NSMenu class.
User Experience 2009-02-04
NSNumberFormatter Class Reference (HTML) (PDF)
Describes a number formatter.
User Experience 2008-11-19
NSOpenGLView Class Reference (HTML) (PDF)
Describes a view for OpenGL drawing.
User Experience 2007-01-26
NSOpenPanel Class Reference (HTML) (PDF)
Describes the panel that a user employs to locate and open a file.
User Experience 2009-02-04