This subclass of NSMutableAttributedString is the data model for Cocoa's text-handling system. NSTextStorage manages one or more NSLayoutManagers, which are responsible for determining how the text should be displayed. Two additional classes have an equally important role in the text-handling system, as does NSTextStorage: NSTextContainer and NSTextView. In terms of the Model-View-Controller pattern, NSTextStorage is the model, NSTextView is the view, and NSLayoutManager and NSTextContainer serve as controllers between the data layer and the view layer.

@interface NSTextStorage : NSMutableAttributedString
// Accessor Methods
- (void)setParagraphs:(NSArray *)paragraphs;
- (NSArray *)paragraphs;
- (void)setForegroundColor:(NSColor *)color;
- (NSColor *)foregroundColor;
- (void)setCharacters:(NSArray *)characters;
- (NSArray *)characters;
- (void)setAttributeRuns:(NSArray *)attributeRuns;
- (NSArray *)attributeRuns;
- (void)setDelegate:(id)delegate;
- (id)delegate;
- (void)setWords:(NSArray *)words;
- (NSArray *)words;
- (void)setFont:(NSFont *)font;
- (NSFont *)font;
// Instance Methods
- (void)addLayoutManager:(NSLayoutManager *)obj;
- (int)changeInLength;
- (void)edited:(unsigned)editedMask range:(NSRange)range changeInLength:(int)delta;
- (unsigned)editedMask;
- (NSRange)editedRange;
- (void)ensureAttributesAreFixedInRange:(NSRange)range;
- (BOOL)fixesAttributesLazily;
- (void)invalidateAttributesInRange:(NSRange)range;
- (NSArray *)layoutManagers;
- (void)processEditing;
- (void)removeLayoutManager:(NSLayoutManager *)obj;
// Methods Implemented by the Delegate
- (void)textStorageDidProcessEditing:(NSNotification *)notification;
- (void)textStorageWillProcessEditing:(NSNotification *)notification;
// Notifications
NSTextStorageDidProcessEditingNotification;
NSTextStorageWillProcessEditingNotification;