By Shirley Wodtke
Study Cocoa™ software improvement no longer in simple terms by means of studying, yet by means of doing. studying Cocoa starts off with crucial object-oriented programming strategies for people with no earlier event. It then introduces the Cocoa surroundings, improvement, instruments, and a few basic tutorials that can assist you comprehend the weather of Cocoa programming. For the remainder of the ebook you create a chain of more and more complicated instance functions, with the code correct within the textual content, so that you easily style it in. each one educational lays the root for the extra complicated suggestions and ideas within the subsequent one. you do not need an intensive programming historical past to paintings with this booklet, even though a few adventure with C is beneficial. in case you already be aware of an object-oriented programming language like Java or Smalltalk, you are going to quick think at domestic with Objective-C, the language of this booklet. Written by means of Apple machine insiders with entry to engineers deeply thinking about growing Mac OS® X, the ebook brings you details you cannot get anyplace else--and a possible leg up within the Mac OS X program improvement industry.
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Extra resources for Learning Cocoa
Allows you to turn on a Quartz debugging mode that flashes yellow over areas of the screen as they are updated by the window server. Sampler Analyzes performance characteristics of your application by sampling the call stack of your program over a user-specified period of time. Book: Learning Cocoa Section: Chapter 4. 4 Useful Command-Line Tools Apple has created or modified several command-line tools for compilation, debugging, performance analysis, and so on. 2 lists some of the more useful tools.
Classes in unrelated branches of the inheritance hierarchy might be typed alike because they conform to the same protocol. Protocols can play a significant role in object-oriented design, especially when a project is divided among many implementors or incorporates objects developed in other projects. Cocoa software uses them heavily to support interprocess communication through Objective-C messages. However, an Objective-C program doesn't need to use protocols. Unlike class definitions and message expressions, they're optional.
A class is more than just an object "factory," however; it can be assigned methods and (in some object-oriented languages) contain variables, just as an object can. Unlike an instance variable, a class variable is not created each time a new instance of the class is created. There is only one copy of the variable for the entire class, no matter how many instances exist. Class methods are typically used to allow a variety of options for creating instances. 4 Methods and Messages Methods are procedures implemented by a class for its objects (or, in the case of class methods, to provide functionality not tied to a particular instance).