异步代码完成后如何运行代码，Swift

Question

我有一个异步函数 loadHTMLString，我调用它来从 HTML 文件中加载文本。 加载过程需要时间，差不多一秒钟。 问题是：如果文件已加载，我想用我的代码打开 go，但我不知道加载何时完成。 有没有办法做到这一点？

func generateAndLoadPDF() {
    // Thats my HTML File
    let html = HTML.get(from: "Vorlage.html")
    // I load this HTML File in my WebView, that takes almost a second
    wkWebView.loadHTMLString(html, baseURL: Bundle.main.bundleURL)
    // I delayed the Following Code, so the HTML-String has time to load
    // Actually I dont want to delay the Code, I want that the following Code runs after .loadHTMLString is finished.
    DispatchQueue.main.asyncAfter(deadline: .now() + 1) {
        // I generate the PDF
        let wkPDFData = PDF.generate(using: self.wkWebViewPrintFormatter())
        self.loadIntoWKWebView(wkPDFData)
    }
}

谢谢，布托什

Answer 1

符合WKNavigationDelegate

webView.navigationDelegate = self

---

extension ViewController: WKNavigationDelegate {  
    func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
        debugPrint("didFinish")
    } 
}