ios - 如何在 Swift 中监控 WKWebView 页面加载进度？

Question

这是我的代码:

@IBOutlet weak var webView: WKWebView!
@IBOutlet weak var progressView: UIProgressView!

override func viewDidLoad() {
    super.viewDidLoad()

    webView.uiDelegate = self
    webView.navigationDelegate = self

    webView.addObserver(self, forKeyPath: "estimatedProgress", options: .new, context: nil)        
}

override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
    if (keyPath == "estimatedProgress") {
        progressView.setProgress(Float(webView.estimatedProgress), animated: true)
        print(webView.estimatedProgress)
    }
}

但 estimatedProgress 仅显示两个 float (0.1 和 1.0)，我认为它不起作用。我使用了 Alamofire 进度，它以毫秒为单位进行更改，这使我的 UI 变得更好，但是这段代码无法正常工作...

有人可以帮助我了解 webView 的进展吗？

Answer 1

swift 4.0

@IBOutlet weak var webView: WKWebView!
@IBOutlet weak var progressView: UIProgressView!
override func viewDidLoad() {
    super.viewDidLoad()

    // load website or HTML page
    self.webView.load(NSURLRequest(url: URL(string: "https://www.apple.com")!) as URLRequest);

    //add observer to get estimated progress value
    self.webView.addObserver(self, forKeyPath: "estimatedProgress", options: .new, context: nil);
}

// Observe value
override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
    if keyPath == "estimatedProgress" {
        print(self.webView.estimatedProgress);
        self.progressView.progress = Float(self.webView.estimatedProgress);
    }
}