This SwiftUI 3 Reference Guide is featuring all major updates and improvements of Apples native user interface framework. It covers not only the basics but more advanced topics as well such as asynchronous task, pull to refresh, search bar, custom swipe action buttons, remote image from an URL, visual effect blur, dismissing the keyboard, markdown text, new alerts & action sheets API, etc.

REQUIREMENTS:

Xcode 13 (free from Apple's developers page)
https://developer.apple.com/xcode/

SwiftUI provides views, controls, and layout structures for declaring your apps user interface. The framework provides event handlers for delivering taps, gestures, and other types of input to your app, and tools to manage the flow of data from your apps models down to the views and controls that users will see and interact with.

Define your app structure using the App protocol, and populate it with scenes that contain the views that make up your apps user interface. Create your own custom views that conform to the View protocol, and compose them with SwiftUI views for displaying text, images, and custom shapes using stacks, lists, and more. Apply powerful modifiers to built-in views and your own views to customize their rendering and interactivity. Share code between apps on multiple platforms with views and controls that adapt to their context and presentation.

Declarative syntax

SwiftUI uses a declarative syntax, so you can simply state what your user interface should do. For example, you can write that you want a list of items consisting of text fields, then describe alignment, font, and color for each field. Your code is simpler and easier to read than ever before, saving you time and maintenance.

This declarative style even applies to complex concepts like animation. Easily add animation to almost any control and choose a collection of ready-to-use effects with only a few lines of code. At runtime, the system handles all of the steps needed to create a smooth movement, and even deals with interruption to keep your app stable. With animation this easy, youll be looking for new ways to make your app come alive.

Design tools

Xcode includes intuitive design tools that make building interfaces with SwiftUI as easy as dragging and dropping. As you work in the design canvas, everything you edit is completely in sync with the code in the adjoining editor. Code is instantly visible as a preview as you type, and any change you make to that preview immediately appears in your code. Xcode recompiles your changes instantly and inserts them into a running version of your app visible, and editable at all times.

Xcode 13

Xcode 13 adds powerful new team development features, perfect for working with Xcode Cloud as well as with GitHub, Bitbucket, and GitLab collaboration features. Initiate, review, comment, and merge pull requests directly within Xcode. See your teammates comments right inside your code. And quickly compare any two versions of your code files.

Easy setup

Take advantage of a complete workflow to manage pull requests directly within Xcode. Create new requests, see a queue of pull requests ready for your review, and quickly view, build, and test results generated locally or by Xcode Cloud.

Teams Comments Online

Comments that your teammates make on code during review display inline within the code editor, along with the name and avatar of the reviewer.

Quick compare

Jump into a comparison view of any two versions of your source code, in any editor, while retaining your current editing context.

Cloud signing

Apps are code-signed using an Apple-hosted service that manages all of your certificates, making App Store submission easier and more reliable. Just sign in to Xcode using your Apple ID, and your Mac is configured for development and deployment based on your membership roles and permissions.

Bottom bar

The always-visible bottom bar shows useful information, such as line and column, and offers direct access to quickly compare different versions of code.

Vim mode

Many common key combinations and editing modes familiar to Vim users are supported directly within the code editor, using the new bottom bar to show mode indicators.

CarPlay simulator

This new simulator for Mac offers complete control over screen size, resolution, and variable input methods, so you can test your CarPlay experience across many different car platforms.

Instant crash reports and feedback

Crash reports from your TestFlight users appear in Xcode Organizer within just a few minutes, complete with user feedback so your testers can tell you exactly what was happening when they experienced the crash. The crash log displays inline and you can jump to the related code with just a click.

Custom documentation

Auto-generate your documentation comments written in Markdown into a documentation set, usable from within the Xcode documentation window. Write your documentation comments inside source files or in documentation extension Markdown files, and choose to share the resulting documentation output bundle with others.

iOS 15

Focus, connect, and explore.

iOS is the worlds most advanced mobile operating system. With iOS 15, you can build apps that connect people in new ways with SharePlay, help them focus on the moment with new notification APIs, and provide new tools for exploring with augmented reality, Safari extensions, and nearby interactions. You can even improve the discovery of your app on the App Store, provide better in-app purchase experiences, and more with the latest capabilities for apps on the App Store.

Resource from the Apple Developer website.