ios - How to monitor WKWebView page load progress in Swift?

Ios - How to monitor WKWebView page load progress in Swift?

To monitor the page load progress of a WKWebView in Swift, you can use the estimatedProgress property of WKWebView along with Key-Value Observing (KVO). Here's a step-by-step guide on how to set this up:

Step-by-Step Implementation

Step 1: Import WebKit Framework

Make sure to import the WebKit framework in your view controller.

import WebKit

Step 2: Add a WKWebView and a Progress View to Your View Controller

Add a WKWebView and a UIProgressView to your view controller. You can do this programmatically or using Interface Builder.

class ViewController: UIViewController { var webView: WKWebView! var progressView: UIProgressView! override func viewDidLoad() { super.viewDidLoad() // Initialize the WKWebView webView = WKWebView(frame: .zero) webView.translatesAutoresizingMaskIntoConstraints = false view.addSubview(webView) // Initialize the ProgressView progressView = UIProgressView(progressViewStyle: .default) progressView.translatesAutoresizingMaskIntoConstraints = false view.addSubview(progressView) // Add constraints to the webView and progressView NSLayoutConstraint.activate([ webView.leadingAnchor.constraint(equalTo: view.leadingAnchor), webView.trailingAnchor.constraint(equalTo: view.trailingAnchor), webView.topAnchor.constraint(equalTo: view.topAnchor), webView.bottomAnchor.constraint(equalTo: view.bottomAnchor), progressView.leadingAnchor.constraint(equalTo: view.leadingAnchor), progressView.trailingAnchor.constraint(equalTo: view.trailingAnchor), progressView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor), ]) // Observe the estimatedProgress property of the webView webView.addObserver(self, forKeyPath: "estimatedProgress", options: .new, context: nil) // Load a URL in the webView if let url = URL(string: "https://www.example.com") { webView.load(URLRequest(url: url)) } } // KVO observer method override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) { if keyPath == "estimatedProgress" { progressView.progress = Float(webView.estimatedProgress) } } deinit { webView.removeObserver(self, forKeyPath: "estimatedProgress") } }

Explanation

  1. Import WebKit: Import the WebKit framework to use WKWebView.

  2. Add WKWebView and UIProgressView: Add these views to your view controller either programmatically or using Interface Builder.

  3. Initialize and Configure WKWebView and UIProgressView: Create instances of WKWebView and UIProgressView, configure their constraints, and add them to the view hierarchy.

  4. Observe estimatedProgress: Use KVO to observe the estimatedProgress property of the WKWebView. This property provides a value between 0.0 and 1.0 indicating the progress of the page load.

  5. Update Progress View: In the observeValue(forKeyPath:of:change:context:) method, update the progress view's progress property based on the estimatedProgress.

  6. Clean Up: Remove the observer in the deinit method to prevent memory leaks.

This approach allows you to monitor and display the page load progress of a WKWebView in your iOS app. The progress view will update as the page loads, providing a visual indicator to the user.

Examples

  1. iOS WKWebView page load progress Swift:

    • Description: Track and display the loading progress of a web page in a WKWebView using Swift.
    • Code:
      // Initialize WKWebView and observe loading progress let webView = WKWebView(frame: view.bounds) webView.navigationDelegate = self view.addSubview(webView) // Add observer for estimatedProgress webView.addObserver(self, forKeyPath: #keyPath(WKWebView.estimatedProgress), options: .new, context: nil) // Implement KVO observer method override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) { if keyPath == "estimatedProgress" { // Update UI with loading progress let progress = webView.estimatedProgress // Update your progress indicator or UI elements } }

  2. iOS WKWebView loading progress bar Swift:

    • Description: Create and update a progress bar based on the WKWebView's loading progress in Swift.
    • Code:
      // Example progress bar setup let progressBar = UIProgressView(progressViewStyle: .default) view.addSubview(progressBar) // Update progress bar based on WKWebView's loading progress progressBar.setProgress(Float(webView.estimatedProgress), animated: true)

  3. iOS WKWebView didFinishNavigation Swift:

    • Description: Handle events when WKWebView finishes loading a page to update UI or perform actions.
    • Code:
      // Implement WKNavigationDelegate method func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) { // Page loading finished, update UI or perform post-loading tasks }

  4. iOS WKWebView loading progress observer Swift:

    • Description: Implement an observer to monitor and display loading progress of a WKWebView page in Swift.
    • Code:
      // Add observer for estimatedProgress webView.addObserver(self, forKeyPath: #keyPath(WKWebView.estimatedProgress), options: .new, context: nil) // Implement KVO observer method override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) { if keyPath == "estimatedProgress" { // Update UI with loading progress let progress = webView.estimatedProgress // Update your progress indicator or UI elements } }

  5. iOS WKWebView progress bar animation Swift:

    • Description: Animate a progress bar to reflect the loading progress of a WKWebView page in Swift.
    • Code:
      // Example progress bar animation UIView.animate(withDuration: 0.3) { progressBar.setProgress(Float(webView.estimatedProgress), animated: true) }

  6. iOS WKWebView loadRequest progress Swift:

    • Description: Track and update loading progress when loading a request in WKWebView using Swift.
    • Code:
      // Load a request in WKWebView let url = URL(string: "https://example.com")! let request = URLRequest(url: url) webView.load(request) // Implement WKNavigationDelegate methods to track loading progress func webView(_ webView: WKWebView, didStartProvisionalNavigation navigation: WKNavigation!) { // Show loading indicator or update UI } func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) { // Hide loading indicator or update UI }

  7. iOS WKWebView progress view Swift:

    • Description: Implement a custom progress view to visualize loading progress of a WKWebView in Swift.
    • Code:
      // Example custom progress view setup let progressView = UIProgressView(progressViewStyle: .default) view.addSubview(progressView) // Update progress view based on WKWebView's loading progress progressView.setProgress(Float(webView.estimatedProgress), animated: true)

  8. iOS WKWebView loading state observer Swift:

    • Description: Monitor and observe the loading state changes of a WKWebView to update UI elements in Swift.
    • Code:
      // Implement WKNavigationDelegate methods func webView(_ webView: WKWebView, didStartProvisionalNavigation navigation: WKNavigation!) { // Show loading indicator or update UI for start of navigation } func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) { // Hide loading indicator or update UI for completion of navigation }

  9. iOS WKWebView progress callback Swift:

    • Description: Implement a callback or delegate method to receive updates on WKWebView's loading progress in Swift.
    • Code:
      // Implement WKNavigationDelegate method for progress updates func webViewWebContentProcessDidTerminate(_ webView: WKWebView) { // Handle termination of web content process, possibly due to exceeding resource limits }

  10. iOS WKWebView estimatedProgress Swift example:

    • Description: Use the estimatedProgress property of WKWebView to monitor and display loading progress in Swift.
    • Code:
      // Access WKWebView's estimatedProgress property let progress = webView.estimatedProgress // Update your progress indicator or UI elements based on 'progress'

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