Code Highlighting in a WebView

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Use Highlight.js to convert your code blocks into beautiful highlighted code in a WebView

SwiftUI Advanced Handbook

Firebase Auth

8:18

Read from Firestore

8:01

Write to Firestore

5:35

Join an Array of Strings

3:33

Data from JSON

5:08

HTTP Request

6:31

WKWebView

5:25

Code Highlighting in a WebView

5:11

Test for Production in the Simulator

1:43

Debug Performance in a WebView

1:57

Debug a Crash Log

2:22

Simulate a Bad Network

2:11

Archive a Build in Xcode

1:28

Apollo GraphQL Part I

6:21

Apollo GraphQL Part 2

6:43

Apollo GraphQL Part 3

5:08

Configuration Files in Xcode

4:35

App Review

5:43

ImagePicker

5:06

Compress a UIImage

3:32

Firebase Storage

11:11

Search Feature

9:13

Push Notifications Part 1

5:59

Push Notifications Part 2

6:30

Push Notifications Part 3

6:13

Network Connection

6:49

Download Files Locally Part 1

6:05

Download Files Locally Part 2

6:02

Offline Data with Realm

10:20

HTTP Request with Async Await

6:11

Xcode Cloud

9:23

SceneStorage and TabView

3:52

Network Connection Observer

4:37

Apollo GraphQL Caching

9:42

Create a model from an API response

5:37

Multiple type variables in Swift

4:23

Parsing Data with SwiftyJSON

9:36

ShazamKit

12:38

Firebase Remote Config

9:05

What is Highlight.js?

Highlight.js is a Javascript package that supports code highlighting for many languages, including Javascript, CSS, Typescript and Swift. It also comes in with over 95 styles for you to choose from.

Make sure to have a WebView in your application. Read the section about WKWebView in this handbook to learn how to integrate an HTML page into your SwiftUI application.

Then, your markdown text should include a code block, like this one:

var markdown = """
# Code highlighting in a WebView
When you build a site, it is important to respect the correct structure for your texts, images and buttons. That's because search engines will read your content and index it based on your structure. Some basic rules are:

- Every page needs an **h1** for title.
- Every page needs meta tags specifically for search engines: **title**, **description**, **keywords**, etc.
- Every image needs an **alt** properties to explain what the image is about. This is also great for accessibility.

  ```jsx
  <img src="/images/logos/logo.svg" alt="logo" />
  <h1>Design and code React apps</h1>
  <p>
    Don’t skip design. Learn design and code by building real apps with
    React and Swift. Complete courses about the best tools.
  </p>

"""

In your **parse** function, wrap your HTML content with a head and a body.

```swift
func parse() -> String {
		let parser = MarkdownParser()
		let html = parser.html(from: markdown)

		let htmlStart = "<HTML><HEAD></HEAD><BODY>"
		let htmlEnd = "</BODY></HTML>"

		return htmlStart + html + htmlEnd
}

Link to the style sheet

Between the HEAD tags, we will add the following link, which will link our webView to Highlight.js's stylesheet, hosted on a Content Delivery Network (or CDN), and will enable the style for the code highlighting.

<link rel=\"stylesheet\" href=\"https://cdnjs.cloudflare.com/ajax/libs/highlight.js/10.7.2/styles/default.min.css\">

It's easy to change to another theme, by simply changing the default into the style you want:

<link rel=\"stylesheet\" href=\"https://cdnjs.cloudflare.com/ajax/libs/highlight.js/10.7.2/styles/atom-one-dark.min.css\">

You can browse the available themes on Highlight.js's demo page.

Add the script

Add the following lines of script just before the BODY closing tag. This will connect to the Highlight.js script hosted on a CDN, as well as initialize the function.

<script src=\"https://cdnjs.cloudflare.com/ajax/libs/highlight.js/10.7.2/highlight.min.js\"></script>
<script>hljs.highlightAll();</script>

Final code with styling

You can style your code block by finding all occurrences of the code tag in your HTML, then adding some style with the style attribute. Here is an example in my parse function:

func parse() -> String {
    let parser = MarkdownParser()
    let html = parser.html(from: markdown)

    let htmlStart = "<HTML><HEAD><link rel=\"stylesheet\" href=\"https://cdnjs.cloudflare.com/ajax/libs/highlight.js/10.7.2/styles/atom-one-dark.min.css\"></HEAD><BODY style=\"padding: 40px; font-size: 20px; font-family: -apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica Neue,sans-serif\">"

    let codeRegex = "<code.*?"
    let contentWithCodeStyling = html.replacingOccurrences(of: codeRegex, with: "$0" + " style=\" margin-bottom: 20px; overflow: scroll; border-radius: 10px; padding: 20px; padding-right: 0; font-family: SF Mono,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica Neue,sans-serif; font-size: 15px; font-weight: 500; line-height: 20px;", options: .regularExpression, range: nil)

    let htmlEnd = "<script src=\"https://cdnjs.cloudflare.com/ajax/libs/highlight.js/10.7.2/highlight.min.js\"></script><script>hljs.highlightAll();</script></BODY></HTML>"

    return htmlStart + contentWithCodeStyling + htmlEnd
}

The final result will look like this:

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Firebase Auth

How to install Firebase authentification to your Xcode project

8:18

Read from Firestore

Install Cloud Firestore in your application to fetch and read data from a collection

8:01

Write to Firestore

Save the data users input in your application in a Firestore collection

5:35

Join an Array of Strings

Turn your array into a serialized String

3:33

Data from JSON

Load data from a JSON file into your SwiftUI application

5:08

HTTP Request

Create an HTTP Get Request to fetch data from an API

6:31

WKWebView

Integrate an HTML page into your SwiftUI application using WKWebView and by converting Markdown into HTML

5:25

Code Highlighting in a WebView

Use Highlight.js to convert your code blocks into beautiful highlighted code in a WebView

5:11

Test for Production in the Simulator

Build your app on Release scheme to test for production

1:43

Debug Performance in a WebView

Enable Safari's WebInspector to debug the performance of a WebView in your application

1:57

Debug a Crash Log

Learn how to debug a crash log from App Store Connect in Xcode

2:22

Simulate a Bad Network

Test your SwiftUI application by simulating a bad network connection with Network Link Conditionner

2:11

Archive a Build in Xcode

Archive a build for beta testing or to release in the App Store

1:28

Apollo GraphQL Part I

Install Apollo GraphQL in your project to fetch data from an API

6:21

Apollo GraphQL Part 2

Make a network call to fetch your data and process it into your own data type

6:43

Apollo GraphQL Part 3

Display the data fetched with Apollo GraphQL in your View

5:08

Configuration Files in Xcode

Create configuration files and add variables depending on the environment - development or production

4:35

App Review

Request an app review from your user for the AppStore

5:43

ImagePicker

Create an ImagePicker to choose a photo from the library or take a photo from the camera

5:06

Compress a UIImage

Compress a UIImage by converting it to JPEG, reducing its size and quality

3:32

Firebase Storage

Upload, delete and list files in Firebase Storage

11:11

Search Feature

Implement a search feature to filter through your content in your SwiftUI application

9:13

Push Notifications Part 1

Set up Firebase Cloud Messaging as a provider server to send push notifications to your users

5:59

Push Notifications Part 2

Create an AppDelegate to ask permission to send push notifications using Apple Push Notifications service and Firebase Cloud Messaging

6:30

Push Notifications Part 3

Tie everything together and test your push notifications feature in production

6:13

Network Connection

Verify the network connection of your user to perform tasks depending on their network's reachability

6:49

Download Files Locally Part 1

Download videos and files locally so users can watch them offline

6:05

Download Files Locally Part 2

Learn how to use the DownloadManager class in your views for offline video viewing

6:02

Offline Data with Realm

Save your SwiftUI data into a Realm so users can access them offline

10:20

HTTP Request with Async Await

Create an HTTP get request function using async await

6:11

Xcode Cloud

Automate workflows with Xcode Cloud

9:23

SceneStorage and TabView

Use @SceneStorage with TabView for better user experience on iPad

3:52

Network Connection Observer

Observe the network connection state using NWPathMonitor

4:37

Apollo GraphQL Caching

Cache data for offline availability with Apollo GraphQL

9:42

Create a model from an API response

Learn how to create a SwiftUI model out of the response body of an API

5:37

Multiple type variables in Swift

Make your models conform to the same protocol to create multiple type variables

4:23

Parsing Data with SwiftyJSON

Make API calls and easily parse data with this JSON package

9:36

ShazamKit

Build a simple Shazam clone and perform music recognition

12:38

Firebase Remote Config

Deliver changes to your app on the fly remotely

9:05

Meet the instructor

We all try to be consistent with our way of teaching step-by-step, providing source files and prioritizing design in our courses.

Stephanie Diep

iOS and Web developer

Developing web and mobile applications while learning new techniques everyday

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