Swift Documentation

This guide introduces Swift programming fundamentals, focusing on concepts and best practices for developers using the Codeunia Learn platform.

Overview

Swift is Apple's modern, safe, and fast language for iOS, macOS, watchOS, tvOS development. It combines performance with ease of use, replacing Objective-C.

Swift Fundamentals

Variables and Constants

var for mutable, let for immutable. Type inference.

Data Types

Int, Double, String, Bool, Array, Dictionary, Set.

Optionals

Handle absence of value safely with ? and !.

Control Flow

if, switch, for-in, while, repeat-while.

Functions

Define with func, parameters, return types. Closures for anonymous functions.

Classes and Structures

Classes for reference, structs for value types. Inheritance, protocols.

Protocols

Define interfaces. Extensions add functionality.

Error Handling

try, catch, throw with Error protocol.

Generics

Reusable code with type parameters.

Memory Management

Automatic Reference Counting (ARC).

Best Practices

Use structs over classes, handle errors, write readable code.

Testing

XCTest framework for unit and UI tests.

Performance Optimization

Profile with Instruments, optimize algorithms.

Deployment

Xcode for building, App Store for distribution.

Resources and References

• Swift Documentation
• Apple Developer
• Swift Playgrounds

Troubleshooting

Common issues include nil crashes, retain cycles. Use LLDB debugger.

Development Setup

Install Xcode, create projects, use SwiftUI for UI.