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Last active October 20, 2022 20:06
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SwiftUI Webview with a Progress Bar
struct Webview: UIViewControllerRepresentable {
let url: URL
func makeUIViewController(context: Context) -> WebviewController {
let webviewController = WebviewController()
let request = URLRequest(url: self.url, cachePolicy: .returnCacheDataElseLoad)
return webviewController
func updateUIViewController(_ webviewController: WebviewController, context: Context) {
class WebviewController: UIViewController, WKNavigationDelegate {
lazy var webview: WKWebView = WKWebView()
lazy var progressbar: UIProgressView = UIProgressView()
deinit {
self.webview.removeObserver(self, forKeyPath: "estimatedProgress")
self.webview.scrollView.removeObserver(self, forKeyPath: "contentOffset")
override func viewDidLoad() {
self.webview.navigationDelegate = self
self.webview.frame = self.view.frame
self.webview.translatesAutoresizingMaskIntoConstraints = false
self.webview.topAnchor.constraint(equalTo: self.view.topAnchor),
self.webview.bottomAnchor.constraint(equalTo: self.view.bottomAnchor),
self.webview.leadingAnchor.constraint(equalTo: self.view.leadingAnchor),
self.webview.trailingAnchor.constraint(equalTo: self.view.trailingAnchor),
webview.scrollView.addObserver(self, forKeyPath: "contentOffset", options: .new, context: nil)
self.progressbar.progress = 0.1
webview.addObserver(self, forKeyPath: "estimatedProgress", options: .new, context: nil)
func setProgressBarPosition() {
self.progressbar.translatesAutoresizingMaskIntoConstraints = false
self.progressbar.topAnchor.constraint(equalTo: self.webview.topAnchor, constant: self.webview.scrollView.contentOffset.y * -1),
self.progressbar.leadingAnchor.constraint(equalTo: self.webview.leadingAnchor),
self.progressbar.trailingAnchor.constraint(equalTo: self.webview.trailingAnchor),
// MARK: - Web view progress
override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
switch keyPath {
case "estimatedProgress":
if self.webview.estimatedProgress >= 1.0 {
UIView.animate(withDuration: 0.3, animations: { () in
self.progressbar.alpha = 0.0
}, completion: { finished in
self.progressbar.setProgress(0.0, animated: false)
} else {
self.progressbar.isHidden = false
self.progressbar.alpha = 1.0
progressbar.setProgress(Float(self.webview.estimatedProgress), animated: true)
case "contentOffset":
super.observeValue(forKeyPath: keyPath, of: object, change: change, context: context)
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OOXXXX commented May 22, 2020

Hi, your code is wonderful, but I have some problems when setting the constraints of the web view. Because on iPad, the web view will be scaled. Could you help me to solve the problem? Thanks
CleanShot 2020-0522 -0921@2x

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I am also having a problem with constraints, particularly with the bottom restraint. Part of the bottom of the webpage is blocked off, and I am unable to click anything on the bottom portion of the webpage.

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Use this one if you want better constraint management

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joshbetz commented Dec 4, 2020

Updated this with better constraint management, although that example looks nicer in general.

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