iOS applications use Cocoa classes, and these classes use the Objective-C programming language so one must know Objective-C if he/she does wish to develop iOS apps. We all know shifting from a loss, non-strict programming language might find iOS’s syntax seem strange and difficult. Don’t worry, this strangeness and difficulties will give way to an elegant experience programming in iOS and I am sure that everyone will appreciate the meticulous language to become an MVC methodologist.
Class @interface and @implementation
iOS separates a class into an @interface and @implementation. An interface declares instance variables, properties and methods. It is a standard C header file and doesn’t provide any method definitions. The implementation, however, contains the method definitions for the class and this is the place where you synthesize the properties. It is the file in a .m extension.
Creating a project with Objective-C Class file
We will create an example project using an Objective-C class and IBAction. First, create a View-Based Application project and name it ClassAndIBAction. After creating the project, single-click the ClassAndIBAction folder and create a new Objective-C Class file. Go to File > New > New File or create the file by pressing Command + N (⌘ + N) buttons …