Tell Xcode where you want to save the new project and make sure to put the project under version control by checking the checkbox labeled Create Git repository on My Mac. Leave the checkboxes at the bottom unchecked. Set Language to Swift and set Devices to iPhone. Name the project FirstSteps and enter an organization name and identifier. The Single View Application template contains the basic building blocks of an iOS application, which makes it a good place to start our journey. From the list of project templates, choose the Single View Application template. In the iOS section on the left, select the Application category. Launch Xcode and create a new project by selecting New > Project. from the File menu. By taking this approach, it will quickly become clear in what context a class is used, how each class fits into the broader scheme of an iOS application, and what role it plays. Instead of exploring the key classes of UIKit, like we did for the Foundation framework, we're going to create and journey through a new iOS project, exploring the classes we encounter. Read this tutorial by Aaron Crabtree if you want to learn more about Objective-C categories. Objective-C categories are a convenient way to add extra methods to existing classes without the need for subclassing. It also adds additional functionality to various Foundation classes, such as NSObject, NSString, and NSValue through the use of Objective-C categories. Like Foundation, UIKit defines classes, protocols, functions, data types, and constants. It's the equivalent of the Application Kit or AppKit framework for OS X development. While the Foundation framework defines classes, protocols, and functions for both iOS and OS X development, the UIKit framework is exclusively geared towards iOS development. In this article, not only will we start our exploration of the UIKit framework, we will also explore the internals of an iOS project and the basic building blocks of iOS applications. It defines the core components of an iOS application, from labels and buttons to table views and navigation controllers. UIKit is the framework that you'll user most often when developing iOS applications.

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