iOS Swift – A Beginner to Advanced Guide with Examples

Swift is Apple’s official programming language for building apps on iOS, macOS, watchOS, and tvOS. Since its introduction in 2014, Swift has quickly become the preferred language for developers due to its speed, safety, and modern syntax. If you’re planning to build iOS apps, mastering Swift is essential.

💡 What is Swift?

Swift is a type-safe, fast, and expressive programming language created by Apple. It’s designed to work with Apple’s frameworks like Cocoa Touch and SwiftUI. Swift is also open-source, meaning you can use it outside the Apple ecosystem too.

🔹 Why Choose Swift for iOS Development?

• Beginner-Friendly – Simple syntax that’s easy to read and write.
• Performance – Compiled to machine code for fast execution.
• Safety – Eliminates common coding errors with strong type-checking.
• Interoperability – Works seamlessly with Objective-C.
• Cross-Platform Potential – Can be used with Swift on server-side projects too.

🛠 Basic Swift Syntax Example

Let’s start with a Hello World program in Swift:

import UIKit

print("Hello, Swift!")        

📌 Explanation:

• import UIKit – Imports Apple’s UI framework.
• print() – Displays text in the console.

📌 Example 1: Variables & Constants in Swift

let name = "JustAcademy"   // Constant
var age = 5               // Variable

print("Welcome to \(name), we are \(age) years old!")        

Output:

Welcome to JustAcademy, we are 5 years old!        

📌 Example 2: Functions in Swift

func greet(user: String) -> String {
    return "Hello, \(user)! Welcome to Swift."
}

print(greet(user: "Roshan"))        

Output:

Hello, Roshan! Welcome to Swift.        

📌 Example 3: iOS Swift – Button Action in a Simple App

import UIKit

class ViewController: UIViewController {
    
    @IBOutlet weak var label: UILabel!
    
    @IBAction func buttonTapped(_ sender: UIButton) {
        label.text = "Button Pressed!"
    }
}        

📌 Explanation:

• @IBOutlet connects UI elements from Storyboard to Swift code.
• @IBAction handles button click events.

📚 Learn iOS Swift with JustAcademy

If you want to master Swift for iOS development, JustAcademy offers a complete iOS training course where you’ll:

• Learn Swift syntax from basics to advanced
• Build real-world iOS apps
• Use Xcode & SwiftUI for UI design
• Prepare for job interviews with hands-on practice

📌 View iOS Training Course Details

📥 Download Free Course Brochure

🎯 Register for a Free Demo Session

🔮 Final Thoughts

Swift is the future of iOS development — fast, safe, and developer-friendly. If you learn Swift, you unlock the potential to create iPhone, iPad, Mac, Apple Watch, and Apple TV apps with one skill set.