In this thesis I share personal experiences related to the development of iOS applications and fundamentals of development for iOS platform. In the first two chapters I bring up some historical and current facts about Apple Inc. (the company behind the iOS operating system and devices that use the operating system), about iPhone and iOS. After the initial portion I concentrate on Objective-C, the main programming language used when developing iOS applications. In this chapter, I explain the main features of the Objective-C language, for example how to define a class, use blocks, which conventions are being used, etc.. Developing iOS application is an interesting process so in the fourth section I present the methods I use when developing iOS applications and my approach to the entire development process. To test the application on his device and publish applications on the App Store, developer is required to pay an annual developer license. I cover that topic and other information related to the publication of applications on the App Store in fifth chapter. In the sixth chapter, I talk about the best course for learning iOS application development “CS139p” which is held at Stanford University. Recordings of these lectures are available to everyone for downloading and they are the best start for any person interested in developing iOS applications. In the last two chapters, I deal with applications and games that I have made and released on the App Store in the last four years. In the chapter about the games I also talk about Sprite Kit, framework for 2D game development for iOS and Mac OS X.