Book Image

An iOS Developer's Guide to SwiftUI

By : Michele Fadda
Book Image

An iOS Developer's Guide to SwiftUI

By: Michele Fadda

Overview of this book

– SwiftUI transforms Apple Platform app development with intuitive Swift code for seamless UI design. – Explore SwiftUI's declarative programming: define what the app should look like and do, while the OS handles the heavy lifting. – Hands-on approach covers SwiftUI fundamentals and often-omitted parts in introductory guides. – Progress from creating views and modifiers to intricate, responsive UIs and advanced techniques for complex apps. – Focus on new features in asynchronous programming and architecture patterns for efficient, modern app design. – Learn UIKit and SwiftUI integration, plus how to run tests for SwiftUI applications. – Gain confidence to harness SwiftUI's full potential for building professional-grade apps across Apple devices.
Table of Contents (25 chapters)
Free Chapter
1
Part 1: Simple Views
5
Part 2: Scrollable Views
8
Part 3: SwiftUI Navigation
11
Part 4: Graphics and Animation
14
Part 5: App Architecture
17
Part 6: Beyond Basics

Using URLSession

URLSession is the class that provides an API for performing HTTP requests and managing network data transfer tasks in iOS and macOS.

In order to get data from a URL with URLSession, you need to perform the steps illustrated in the following sequence diagram:

Figure 15.2 – Conceptual flow for performing a GET with URLSession

Figure 15.2 – Conceptual flow for performing a GET with URLSession

Implementing HTTP methods

HTTP methods (GET, POST, PUT, DELETE, etc.) are specified by setting the HTTP method of a URLRequest.

As an example, let’s create a POST request.

A POST request submits data to a specified resource (it creates the resource on the server, e.g., a new user):

let url = URL(string: "https://example.com/post")!
var request = URLRequest(url: url)
request.httpMethod = "POST"
request.setValue("application/json", forHTTPHeaderField: "Content-Type")
let postData = ["key": "value"]
let jsonData = try! JSONSerialization...