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Introduction to iOS Development

🗓 May 31, 2026 • ⏱ 3 min read

What is iOS?

iOS is Apple’s operating system that powers the iPhone (iPadOS is its close cousin for iPad). Unlike Android, which runs on hardware from many companies, iOS runs only on Apple’s own devices. This tight control over hardware and software is why iOS apps feel so consistent and smooth — and it shapes how you develop for the platform.

When you build an iOS app, you are writing software that sits on top of Apple’s frameworks (large libraries of ready-made functionality) and runs inside a tightly managed, secure environment called a “sandbox”. Your app can only touch its own data and must ask permission for anything sensitive (camera, location, contacts).

Why you need a Mac

This is the first thing beginners must know: iOS development requires a Mac computer. Apple’s development tool, Xcode, runs only on macOS, and only Xcode can build, sign and submit iOS apps. You cannot officially develop iOS apps on Windows or Linux. If you don’t own a Mac, options include a Mac mini, a cloud Mac service, or cross-platform tools like Flutter or React Native (covered in other courses).

The language: Swift

Modern iOS apps are written in Swift, a fast, safe, modern language Apple introduced in 2014 to replace the older Objective-C. Swift is designed to prevent common bugs (like using a value that doesn’t exist) at compile time, and it reads almost like English.

let name = "Anand"
print("Hello, \(name)!")   // string interpolation with \()

Two ways to build the UI

Apple gives you two UI frameworks, and it’s important to understand the difference:

  • UIKit — the older, battle-tested framework (since 2008). You build screens with view controllers and Auto Layout. Most existing apps use it, so it’s valuable to know.
  • SwiftUI — the modern, declarative framework (since 2019). You describe the UI and it updates itself. It needs far less code and is the future. (It has its own dedicated course.)

In this iOS course we focus on the foundations — Swift and UIKit — because they teach you how the platform really works underneath.

What you need to start

  • A Mac running a recent macOS.
  • Xcode, free from the Mac App Store (it’s a large download).
  • An Apple ID — free to test on your own devices and the Simulator. A paid Apple Developer Program membership (about $99/year) is needed only to publish to the App Store.

How an iOS app runs

When the user taps your app icon, iOS launches your app, creates a window, and hands control to your code. Your app responds to events (taps, scrolls, notifications) and draws screens. When the user leaves, iOS may suspend or terminate the app to save battery and memory — an important idea you’ll see again in the app lifecycle lesson.

Common beginner questions

  • “Can I use Windows?” — not for native iOS; use a Mac or a cross-platform framework.
  • “Swift or Objective-C?” — Swift for everything new.
  • “UIKit or SwiftUI?” — learn SwiftUI for new apps, but UIKit knowledge helps you work on real, existing codebases.
Summary: iOS runs only on Apple devices and is developed on a Mac with Xcode, using Swift. UIKit is the established UI framework; SwiftUI is the modern one. Apps run in a secure sandbox and respond to system events.