What are error handling patterns for WKWebView in Swift?

When working with WKWebView in Swift, it's important to handle errors that may arise during loading content or executing JavaScript. Effective error handling improves user experience and allows for graceful recovery from issues.

Here are common error handling patterns for WKWebView:

  • Implement WKNavigationDelegate: Utilize the delegate methods to monitor the loading process and handle errors.
  • Handle HTTP Errors: Check for HTTP errors by examining the URL response.
  • JavaScript Execution Errors: Utilize evaluateJavaScript(_:completionHandler:) to catch errors that occur during JavaScript execution.

Here’s an example of how to implement error handling in WKWebView:

// Swift import UIKit import WebKit class ViewController: UIViewController, WKNavigationDelegate { var webView: WKWebView! override func viewDidLoad() { super.viewDidLoad() webView = WKWebView(frame: self.view.frame) webView.navigationDelegate = self self.view.addSubview(webView) if let url = URL(string: "https://www.example.com") { let request = URLRequest(url: url) webView.load(request) } } funcwebView(_ webView: WKWebView, didFail navigation: WKNavigation!, withError error: Error) { // Handle error here print("Failed to load with error: \(error.localizedDescription)") } func webView(_ webView: WKWebView, didFailProvisionalNavigation navigation: WKNavigation!, withError error: Error) { // Handle provisional navigation errors here print("Provisional navigation failed with error: \(error.localizedDescription)") } }

WKWebView Swift error handling iOS development navigation delegate JavaScript errors user experience

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