Swift 未加载Xcode Webview项目

我有一个Xcode项目，它有一个Webview和一个TabBar，我可以用TabBar在Webview之间切换。我的问题是，当我把我的购物卡中的东西放在下面，并用TabBar切换到我的购物卡url时，里面的项目不可见。我怎样才能解决这个问题？ShoppingCard URL以.php结尾。下面是实现的代码

我还在YouTube上上传了一段视频，我可以看到错误

查看主页：

import UIKit
import WebKit

class viewHome: UIViewController, WKUIDelegate {



@IBOutlet var webViewHome: WKWebView!


 override func loadView() {
       let webConfiguration = WKWebViewConfiguration()
       webViewHome = WKWebView(frame: .zero, configuration: webConfiguration)
       webViewHome.uiDelegate = self
       webViewHome.configuration.preferences.javaScriptEnabled = true
       //webViewHome.configuration.preferences.javaEnabled = true

       view = webViewHome

}

override func viewDidLoad() {
    super.viewDidLoad()

    let url = URL(string: "https://lieferworld.de")
    let request = URLRequest(url: url!)
    webViewHome.configuration.preferences.javaScriptEnabled = true
    //webViewHome.configuration.preferences.javaEnabled = true
    webViewHome.load(request)
}




@IBAction func GoBackHome(_ sender: Any) {


    if webViewHome.canGoBack {

        webViewHome.goBack()

    }

}



@IBAction func GoForwardHome(_ sender: Any) {

    if webViewHome.canGoForward {

        webViewHome.goForward()

    }

}

import UIKit
import WebKit

class viewShopping: UIViewController, WKUIDelegate {




@IBOutlet var webViewShopping: WKWebView!

override func loadView() {
       let webConfiguration = WKWebViewConfiguration()
       webViewShopping = WKWebView(frame: .zero, configuration: webConfiguration)
       webViewShopping.uiDelegate = self
       //webViewShopping.configuration.preferences.javaEnabled = true
       webViewShopping.configuration.preferences.javaScriptEnabled = true

       view = webViewShopping
}

override func viewDidLoad() {
    super.viewDidLoad()

    let url = URL(string: "https://lieferworld.de/warenkorb.php")
    let request = URLRequest(url: url!)
    webViewShopping.configuration.preferences.javaScriptEnabled = true
    //webViewShopping.configuration.preferences.javaEnabled = true

    webViewShopping.load(request)
}

@IBAction func goBackShoppingCart(_ sender: Any) {

    if webViewShopping.canGoBack {

        webViewShopping.goBack()

    }

}


@IBAction func goForwardShoppingCart(_ sender: Any) {

if webViewShopping.canGoForward {

        webViewShopping.goForward()

    }

}


@IBAction func webViewRefresh(_ sender: Any) {

    webViewShopping.reload()
}

}

}

查看购物|购物车类：

import UIKit
import WebKit

class viewHome: UIViewController, WKUIDelegate {



@IBOutlet var webViewHome: WKWebView!


 override func loadView() {
       let webConfiguration = WKWebViewConfiguration()
       webViewHome = WKWebView(frame: .zero, configuration: webConfiguration)
       webViewHome.uiDelegate = self
       webViewHome.configuration.preferences.javaScriptEnabled = true
       //webViewHome.configuration.preferences.javaEnabled = true

       view = webViewHome

}

override func viewDidLoad() {
    super.viewDidLoad()

    let url = URL(string: "https://lieferworld.de")
    let request = URLRequest(url: url!)
    webViewHome.configuration.preferences.javaScriptEnabled = true
    //webViewHome.configuration.preferences.javaEnabled = true
    webViewHome.load(request)
}




@IBAction func GoBackHome(_ sender: Any) {


    if webViewHome.canGoBack {

        webViewHome.goBack()

    }

}



@IBAction func GoForwardHome(_ sender: Any) {

    if webViewHome.canGoForward {

        webViewHome.goForward()

    }

}

import UIKit
import WebKit

class viewShopping: UIViewController, WKUIDelegate {




@IBOutlet var webViewShopping: WKWebView!

override func loadView() {
       let webConfiguration = WKWebViewConfiguration()
       webViewShopping = WKWebView(frame: .zero, configuration: webConfiguration)
       webViewShopping.uiDelegate = self
       //webViewShopping.configuration.preferences.javaEnabled = true
       webViewShopping.configuration.preferences.javaScriptEnabled = true

       view = webViewShopping
}

override func viewDidLoad() {
    super.viewDidLoad()

    let url = URL(string: "https://lieferworld.de/warenkorb.php")
    let request = URLRequest(url: url!)
    webViewShopping.configuration.preferences.javaScriptEnabled = true
    //webViewShopping.configuration.preferences.javaEnabled = true

    webViewShopping.load(request)
}

@IBAction func goBackShoppingCart(_ sender: Any) {

    if webViewShopping.canGoBack {

        webViewShopping.goBack()

    }

}


@IBAction func goForwardShoppingCart(_ sender: Any) {

if webViewShopping.canGoForward {

        webViewShopping.goForward()

    }

}


@IBAction func webViewRefresh(_ sender: Any) {

    webViewShopping.reload()
}

}

---

WKNavigationDelegate有三个代理

这里有一个例子

func webView(_ webView: WKWebView, didFailProvisionalNavigation navigation: WKNavigation!, withError error: Error) {
    print(error.localizedDescription)
 }
 func webView(_ webView: WKWebView, didStartProvisionalNavigation navigation: WKNavigation!) {
    print("Start page load")
 }
 func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!)
 {
    let title = webView.title
    print("finish  load. \(title).")
    // you can do processing on the results here or trigger processing elsewhere 
    webView.evaluateJavaScript("document.documentElement.outerHTML.toString()",completionHandler:
    { (html: Any?, error: Error?) in
                                  print(html as Any)
                                  self.htmlSource = html as! String
                                  NotificationCenter.default.post(name: NSNotification.Name(rawValue: "pageLoaded"), object: nil)

    })
 }

---

将WKNavigationDelegate添加到类定义中并实现委托。我实现了WKNavigationDelegate，但实现委托的含义是什么？您能给我看一个示例代码吗？顺便说一句，非常感谢您的回答首先非常感谢，问题是我是swift的新手，我知道这对您来说是不必要的工作，但可以为我编写代码，以便我的购物车中的东西可见？您应该专注于管理网页。购物车不是web显示功能的一部分，它是后端。首先确保可以正确显示页面。