为什么我的UIScrollView中的WKWebview不显示？

Question

我需要在UIScrollView的内容视图内添加一个WKWebview来加载Web内容。

我正在使用Apple代码加载网页，我的出口viewForWebview正确链接，并且调用了didFinish。

class ViewController: UIViewController, WKUIDelegate, WKNavigationDelegate {

    var webView: WKWebView!
    @IBOutlet var viewForWebview: UIView!

    override func loadView() {
        super.loadView()
        let myConfiguration = WKWebViewConfiguration()
        webView = WKWebView(frame: .zero, configuration: myConfiguration)
        webView.uiDelegate = self
        webView.navigationDelegate = self
        viewForWebview = webView
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        let url = URL(string: "https://www.google.com.au")
        let request = URLRequest(url: url!)
        webView.load(request)
    }

    func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
        print("Finished navigating to url \(String(describing: webView.url))")
    }

    func webView(_ webView: WKWebView, didFail navigation: WKNavigation!, withError error: Error) {
        print(error)
    }
}

但是我的WKWebview是空白的：

为了进行测试，我尝试将WKWebview直接显示在滚动视图的内容视图中，并且可以正常工作。

为什么它不能用作内容的子视图？

Answer 1

不要为此类操作覆盖loadView，您需要

class ViewController: UIViewController, WKUIDelegate, WKNavigationDelegate {

    var webView: WKWebView!
    @IBOutlet var viewForWebview: UIView!


    override func viewDidLoad() {
        super.viewDidLoad()


        let myConfiguration = WKWebViewConfiguration()
        webView = WKWebView(frame:.zero, configuration: myConfiguration)
        webView.uiDelegate = self
        webView.navigationDelegate = self
        viewForWebview.addSubview(webView)
        webView.translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate([
            webView.topAnchor.constraint(equalTo: viewForWebview.topAnchor),
            webView.bottomAnchor.constraint(equalTo: viewForWebview.bottomAnchor),
            webView.leadingAnchor.constraint(equalTo: viewForWebview.leadingAnchor),
            webView.trailingAnchor.constraint(equalTo: viewForWebview.trailingAnchor)

        ])

        let url = URL(string: "https://www.apple.com")
        let request = URLRequest(url: url!)
        webView.load(request)
    }

    func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
        print("Finished navigating to url \(String(describing: webView.url))")
    }

    func webView(_ webView: WKWebView, didFail navigation: WKNavigation!, withError error: Error) {
        print(error)
    }
}