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Leopard Technical Q&As: Cocoa
Objective-C is an ANSI C compatible language with dynamic object-oriented extensions. It is tailored for the efficient development and runtime performance of Cocoa programs. Because the language is an extension of ANSI C, developers can adapt existing C programs to use Objective-C frameworks without losing any original development work.
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Building Objective-C static libraries with categories (HTML)
QA1490: Describes how to properly build Objective-C static libraries that contain categories on existing classes.
 2006-10-03
Common mistakes with delegation in Cocoa (HTML)
QA1554: The two most common errors that lead to a delegate method not being received.
 2008-02-27
Core Animation properties and Reference Counting (HTML)
QA1565: Describes a discrepancy between the property declarations in Core Animation and the actual behavior.
 2008-11-24
Determining if an application uses Objective-C Garbage Collection (HTML)
QA1599: Shows how to determine if an application or executable is using Objective-C Garbage Collection.
 2008-09-08
How do I get the hexadecimal value of an NSColor object? (HTML)
QA1576: Describes how to convert an NSColor object to its Hexadecimal value.
 2007-12-19
Variable arguments in Objective-C methods (HTML)
QA1405: How to implement methods which take a variable number of arguments.
 2005-01-13