WKWebView
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Integrate an HTML page into your SwiftUI application using WKWebView and by converting Markdown into HTML
SwiftUI Advanced Handbook
1
Firebase Auth
8:18
2
Read from Firestore
8:01
3
Write to Firestore
5:35
4
Join an Array of Strings
3:33
5
Data from JSON
5:08
6
HTTP Request
6:31
7
WKWebView
5:25
8
Code Highlighting in a WebView
5:11
9
Test for Production in the Simulator
1:43
10
Debug Performance in a WebView
1:57
11
Debug a Crash Log
2:22
12
Simulate a Bad Network
2:11
13
Archive a Build in Xcode
1:28
14
Apollo GraphQL Part I
6:21
15
Apollo GraphQL Part 2
6:43
16
Apollo GraphQL Part 3
5:08
17
Configuration Files in Xcode
4:35
18
App Review
5:43
19
ImagePicker
5:06
20
Compress a UIImage
3:32
21
Firebase Storage
11:11
22
Search Feature
9:13
23
Push Notifications Part 1
5:59
24
Push Notifications Part 2
6:30
25
Push Notifications Part 3
6:13
26
Network Connection
6:49
27
Download Files Locally Part 1
6:05
28
Download Files Locally Part 2
6:02
29
Offline Data with Realm
10:20
30
HTTP Request with Async Await
6:11
31
Xcode Cloud
9:23
32
SceneStorage and TabView
3:52
33
Network Connection Observer
4:37
34
Apollo GraphQL Caching
9:42
35
Create a model from an API response
5:37
36
Multiple type variables in Swift
4:23
37
Parsing Data with SwiftyJSON
9:36
38
ShazamKit
12:38
39
Firebase Remote Config
9:05
Markdown code
Markdown is a lightweight format to style any text and is really easy to use. For example, all the READMEs on Github are written in Markdown. You can learn more about Markdown's syntax here.
To start off, we'll need to get our Markdown text. We will use the following sample Markdown text from Github Guides and we will convert it into HTML code.
# An exhibit of Markdown
This note demonstrates some of what [Markdown][1] is capable of doing.
*Note: Feel free to play with this page. Unlike regular notes, this doesn't automatically save itself.*
## Basic formatting
Paragraphs can be written like so. A paragraph is the basic block of Markdown. A paragraph is what text will turn into when there is no reason it should become anything else.
Paragraphs must be separated by a blank line. Basic formatting of *italics* and **bold** is supported. This *can be **nested** like* so.
## Lists
### Ordered list
1. Item 1
2. A second item
3. Number 3
4. Ⅳ
*Note: the fourth item uses the Unicode character for [Roman numeral four][2].*
### Unordered list
* An item
* Another item
* Yet another item
* And there's more...
## Paragraph modifiers
### Code block
`Code blocks are very useful for developers and other people who look at code or other things that are written in plain text. As you can see, it uses a fixed-width font.`
You can also make `inline code` to add code into other things.
### Quote
> Here is a quote. What this is should be self explanatory. Quotes are automatically indented when they are used.Convert Markdown into HTML
To convert the Markdown text into HTML, we will need to use a package called Ink, which is a package written in Swift that does just that. Let's add the package using Swift Package Manager and the Github repository link (https://github.com/JohnSundell/Ink).
Next, let's create a new file called ParseContent.swift. Let's import Ink at the top of our file first.
// ParseContent.swift
import InkCreate a ParseContent class.
// ParseContent.swift
class ParseContent {
}In that class, let's save our Markdown text into a multiline String.
// ParseContent.swift
var markdown = """
# An exhibit of Markdown
This note demonstrates some of what [Markdown][1] is capable of doing.
*Note: Feel free to play with this page. Unlike regular notes, this doesn't automatically save itself.*
## Basic formatting
Paragraphs can be written like so. A paragraph is the basic block of Markdown. A paragraph is what text will turn into when there is no reason it should become anything else.
Paragraphs must be separated by a blank line. Basic formatting of *italics* and **bold** is supported. This *can be **nested** like* so.
## Lists
### Ordered list
1. Item 1
2. A second item
3. Number 3
4. Ⅳ
*Note: the fourth item uses the Unicode character for [Roman numeral four][2].*
### Unordered list
* An item
* Another item
* Yet another item
* And there's more...
## Paragraph modifiers
### Code block
`Code blocks are very useful for developers and other people who look at code or other things that are written in plain text. As you can see, it uses a fixed-width font.`
You can also make `inline code` to add code into other things.
### Quote
> Here is a quote. What this is should be self explanatory. Quotes are automatically indented when they are used.
"""Then, let's use the Ink package to convert the Markdown into HTML.
// ParseContent.swift
let parser = MarkdownParser()
let html = parser.html(from: markdown)Create your WebView
Create a new file called WebView.swift that will take the following WebView struct:
import SwiftUI
import WebKit
struct WebView : UIViewRepresentable {
var html: String
func makeUIView(context: Context) -> WKWebView {
return WKWebView()
}
func updateUIView(_ webView: WKWebView, context: Context) {
webView.loadHTMLString(html, baseURL: nil)
}
}Afterwards, you'll just need to call the WebView struct and pass in your html String as an argument, and you'll get your HTML page.
// ContentView.swift
@State var htmlContent: String = ""
var body: some View {
WebView(html: htmlContent)
.onAppear() {
htmlContent = ParseContent().parse()
}
}
Add some styling to your WebView
By default, the HTML rendered in the WebView will be in Times New Roman. In order to style it, let's go back to our ParseContent.swift file. There, we will use inline CSS in order to add some styling to our WebView.
In the parse() function, we will wrap the HTML in a styled div.
func parse() -> String {
let parser = MarkdownParser()
let html = parser.html(from: markdown)
let htmlStart = "<div style=\"padding: 40px; font-family: -apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica Neue,sans-serif\">"
let htmlEnd = "</div>"
return htmlStart + html + htmlEnd
}In the above code, we are adding a padding on the div and changing the font-family to the default Apple system font, which is SF Pro.
You can style your HTML as much as you want and also style a specific tag, like the h1, by using regex expressions and replacing all the occurrences, like so:
let titleRegex: String = "<h1.*?"
let titleContent = html.replacingOccurrences(of: titleRegex, with: "$0" + " style=\"color: blue; font-size: 40px", options: .regularExpression, range: nil)Learn with videos and source files. Available to Pro subscribers only.
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1
Firebase Auth
How to install Firebase authentification to your Xcode project
8:18
2
Read from Firestore
Install Cloud Firestore in your application to fetch and read data from a collection
8:01
3
Write to Firestore
Save the data users input in your application in a Firestore collection
5:35
4
Join an Array of Strings
Turn your array into a serialized String
3:33
5
Data from JSON
Load data from a JSON file into your SwiftUI application
5:08
6
HTTP Request
Create an HTTP Get Request to fetch data from an API
6:31
7
WKWebView
Integrate an HTML page into your SwiftUI application using WKWebView and by converting Markdown into HTML
5:25
8
Code Highlighting in a WebView
Use Highlight.js to convert your code blocks into beautiful highlighted code in a WebView
5:11
9
Test for Production in the Simulator
Build your app on Release scheme to test for production
1:43
10
Debug Performance in a WebView
Enable Safari's WebInspector to debug the performance of a WebView in your application
1:57
11
Debug a Crash Log
Learn how to debug a crash log from App Store Connect in Xcode
2:22
12
Simulate a Bad Network
Test your SwiftUI application by simulating a bad network connection with Network Link Conditionner
2:11
13
Archive a Build in Xcode
Archive a build for beta testing or to release in the App Store
1:28
14
Apollo GraphQL Part I
Install Apollo GraphQL in your project to fetch data from an API
6:21
15
Apollo GraphQL Part 2
Make a network call to fetch your data and process it into your own data type
6:43
16
Apollo GraphQL Part 3
Display the data fetched with Apollo GraphQL in your View
5:08
17
Configuration Files in Xcode
Create configuration files and add variables depending on the environment - development or production
4:35
18
App Review
Request an app review from your user for the AppStore
5:43
19
ImagePicker
Create an ImagePicker to choose a photo from the library or take a photo from the camera
5:06
20
Compress a UIImage
Compress a UIImage by converting it to JPEG, reducing its size and quality
3:32
21
Firebase Storage
Upload, delete and list files in Firebase Storage
11:11
22
Search Feature
Implement a search feature to filter through your content in your SwiftUI application
9:13
23
Push Notifications Part 1
Set up Firebase Cloud Messaging as a provider server to send push notifications to your users
5:59
24
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
25
Push Notifications Part 3
Tie everything together and test your push notifications feature in production
6:13
26
Network Connection
Verify the network connection of your user to perform tasks depending on their network's reachability
6:49
27
Download Files Locally Part 1
Download videos and files locally so users can watch them offline
6:05
28
Download Files Locally Part 2
Learn how to use the DownloadManager class in your views for offline video viewing
6:02
29
Offline Data with Realm
Save your SwiftUI data into a Realm so users can access them offline
10:20
30
HTTP Request with Async Await
Create an HTTP get request function using async await
6:11
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Xcode Cloud
Automate workflows with Xcode Cloud
9:23
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SceneStorage and TabView
Use @SceneStorage with TabView for better user experience on iPad
3:52
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Network Connection Observer
Observe the network connection state using NWPathMonitor
4:37
34
Apollo GraphQL Caching
Cache data for offline availability with Apollo GraphQL
9:42
35
Create a model from an API response
Learn how to create a SwiftUI model out of the response body of an API
5:37
36
Multiple type variables in Swift
Make your models conform to the same protocol to create multiple type variables
4:23
37
Parsing Data with SwiftyJSON
Make API calls and easily parse data with this JSON package
9:36
38
ShazamKit
Build a simple Shazam clone and perform music recognition
12:38
39
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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