Swift 2025: Where to Start Learning the Language for iOS/macOS

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Introduction to Swift: Where to Start in 2025

Swift is a powerful and intuitive programming language created by Apple for developing applications for iOS, macOS, watchOS, and tvOS. In 2025, Swift continues to actively evolve: version 6.0 has been released, bringing an improved memory ownership system and new capabilities for concurrent programming. If you want to start a career as an iOS developer or simply learn a new language, Swift is an excellent choice due to its performance, safety, and modern syntax.

In this article, we will break down where to start learning Swift in 2025: installing the necessary tools, first steps in Xcode, writing simple programs, and useful resources for learning.

1. Installing Xcode and Setting Up the Environment

For Swift development, you will need macOS and the free Xcode development environment. As of 2025, the current version is Xcode 16, which comes with Swift 6.0 and SDKs for iOS 19 and macOS 15 Sequoia.

How to Install Xcode

Open the App Store on your Mac.
Search for "Xcode" and click "Install" (size is about 8 GB).
After installation, open Xcode and accept the license agreement.
Make sure you have the latest iOS simulators installed (via Settings → Platforms menu).

You can also install Swift separately via swift.org for use in console projects on Linux or Windows, but Xcode is mandatory for full-fledged iOS development.

First Encounter: Playground

Playground is an interactive environment for experimenting with code without creating a full project. Open Xcode and select "Get started with a playground" → "Blank". Here is a very simple example:

import SwiftUI

var greeting = "Hello, Swift!"print(greeting)

let pi = 3.14159let radius = 5.0let area = pi * radius * radiusprint("Circle area: \\(area)")

You will see the result in the right side panel — this is instant feedback, perfect for beginners.

2. Basics of Swift 6.0 Syntax

Swift combines the best practices from C and Objective-C, but with a safer and more expressive syntax. Let's look at the key concepts.

Variables and Constants

var is used to declare variables, let for constants. The data type is inferred automatically:

var name = "Anna"      // Stringlet age = 25           // Int (immutable)var height: Double = 1.75  // explicit type annotation

Basic Data Types

Int, Double, Float — numbers
String — strings
Bool — boolean values (true/false)
Array, Dictionary, Set — collections

Control Flow

let score = 85

if score >= 90 {    print("Excellent!")} else if score >= 70 {    print("Good")} else {    print("Needs improvement")}

// Loop over an arraylet fruits = ["Apple", "Pear", "Banana"]for fruit in fruits {    print(fruit)}

Functions

Functions in Swift are first-class objects. They can have external and internal parameter names:

func greet(person: String, from city: String) -> String {    return "Hello, \\(person)! Are you from \\(city)?"}

let message = greet(person: "Ivan", from: "Moscow")print(message)