The first definitive, comprehensive reference to the Objective-C language core and Foundation class libraries, Objective-C Essential Reference recognizes that your time is valuable and your attention is precious.

Whether you develop for iOS, OS X, or both, it has been organized and indexed to give you instant access to what you really need to solve your problem right now: concise, complete details about how the language and libraries actually work, supported by brief code snippets wherever they help illustrate implementation and usage. It presents fully up-to-date coverage of all these topics, and more
 

• Non-object data types, procedural flow control, language structure, basic and advanced program structure
• General Foundation class protocols, structures, macros, strings/string processing, characters, scalar object types, dates/times, sets, arrays, dictionaries/property lists, and weak collections
• Core Foundation, preferences, predicates, event-driven programming, concurrency, internationalization/localization, I/O, and networking
• Appendices covering compilers and tools, as well as a full glossary