When the compiler sees the #include directive, it makes a dumb copy-and-paste of the contents of the file to include. #import is faster and more efficient as compared to #include used in c. The Foundation framework contains fundamental classes that are used in all iOS apps and OS X applications. A framework is a set of related classes, functions, constants, and types. When Xcode creates the project, it imports the Foundation framework. This statement is written above the main function. Main is the name of the function that is called when a program first starts. In a few moments, you’ll see Xcode’s main interface like this: As its visible in the above image the extension used for Objective-C programs is. Repository won’t be needed for this project so uncheck the box labeled Create git repository. Choose the language as Objective-C as shown below and click next : In the next window, choose the folder in which you want your project directory to be created. Enter your respective organisation details and the Project Name. Xcode resides in the Applications folder and the following dialogs pop up when its launched : Choose Create a new XCode Project and follow the setup wizard given below : In these tutorials we’ll focus on the basic programming aspects and stay away from user interfaces to avoid complications, hence select Command Line Tools and click Next. XCode is Apple’s Integrated Development Environment and is only available on Mac. The main application that will be needed to write iOS and Mac Applications is Xcode.

All Objective-C programming is done with the Foundation framework. The Objective-C programming language is based on C, but it adds support for object-oriented programming. Objective-C is the programming language that is used to write applications for Apple’s iOS and OS X operating systems. Since it has been conventional to begin a programming course with a program that writes the words “Hello world!” to the computer screen we’ll begin this tutorial by getting started with the Developer Tools and then dive into the Hello World code.

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