Learn SWIFTUI with Real Code Examples
Updated Nov 23, 2025
Explain
SwiftUI enables building native Apple apps using a declarative syntax.
It integrates seamlessly with Swift and Apple’s ecosystem, providing live previews in Xcode.
Ideal for developers focusing on iOS/macOS apps who want fast, maintainable, and modern UI development.
Core Features
Swift-based declarative UI components
State-driven rendering with @State, @Binding, @ObservedObject
Integration with Combine for reactive programming
Support for Dark Mode, localization, accessibility
Previews and canvas in Xcode for real-time feedback
Basic Concepts Overview
Views are Swift structs conforming to `View` protocol
Use @State, @Binding, @ObservedObject for reactive state
Modifiers change view properties (e.g., `.padding()`, `.background()`)
Combine used for asynchronous/reactive updates
Previews provide real-time feedback in Xcode canvas
Project Structure
App/ - main entry point and app lifecycle
Views/ - reusable SwiftUI view components
Models/ - data models
Assets/ - images, colors, fonts
Supporting files - Info.plist, AppDelegate, SceneDelegate
Building Workflow
Create SwiftUI project in Xcode
Define Views and layout using declarative syntax
Manage state with property wrappers
Test UI with Xcode previews and simulators
Run app on device and optimize performance
Difficulty Use Cases
Beginner: simple forms and static views
Intermediate: dynamic data-driven UI using @State and @ObservedObject
Advanced: integrating Combine and animations
Expert: bridging SwiftUI with UIKit/AppKit
Community: contributing SwiftUI packages and components
Comparisons
SwiftUI vs UIKit: declarative vs imperative UI building
SwiftUI vs React Native: native Apple-only vs cross-platform JS
SwiftUI offers seamless integration with Apple ecosystem
UIKit may still be needed for complex legacy components
SwiftUI emphasizes speed, maintainability, and live previews
Versioning Timeline
2019 – SwiftUI introduced at WWDC
2020 – SwiftUI 2.0 added improved controls, widgets, and Lazy stacks
2021 – SwiftUI 3.0 expanded macOS and iPadOS support
2022–2023 – SwiftUI performance and API enhancements
2024–2025 – Ongoing updates with latest iOS/macOS features
Glossary
View: a SwiftUI UI element conforming to View protocol
Modifier: methods that change view properties
@State/@Binding: property wrappers for state management
Combine: reactive framework for data streams
Preview: live rendering of SwiftUI view in Xcode