WKweb 视图没有正确加载？答案

【问题标题】：WKweb view not loading properly?WKweb 视图没有正确加载？
【发布时间】：2017-10-12 05:42:58
【问题描述】：

class WebViewController: UIViewController,WKUIDelegate { var _responseData: 数据？

@IBOutlet weak var webViewMain: WKWebView!
var language: Int = 0
var movieName = String()
var urlStrng = String()
var urlMain: URL?
var data: Data?
var fileName = String()
var queue = OperationQueue()
 var pathOriginal = String()
var pathDuplocate = String()
var refreshAlert = UIAlertController()
override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view.
    //creating music folder this plays key role
    webViewMain.translatesAutoresizingMaskIntoConstraints = false
    let height = NSLayoutConstraint(item: webViewMain, attribute: .height, relatedBy: .equal, toItem: view, attribute: .height, multiplier: 1, constant: 0)
    let width = NSLayoutConstraint(item: webViewMain, attribute: .width, relatedBy: .equal, toItem: view, attribute: .width, multiplier: 1, constant: 0)
    view.addConstraints([height, width])
    let webConfiguration = WKWebViewConfiguration()
    webViewMain = WKWebView(frame: .zero, configuration: webConfiguration)
    webViewMain.uiDelegate = self
    webViewMain.navigationDelegate = self
    view = webViewMain
    switch language {
    case 1:
        urlStrng = "https://cse.google.co.in/cse?cx=005819264335345607731:ta3f5zeiqpm&q=king&oq=king&gs_l=partner.3...0.0.1.177130.0.0.0.0.0.0.0.0..0.0.gsnos%%2Cn%%3D13...0.0..1ac..25.partner..3.1.288.ArU-FOKoCOI#gsc.tab=0&gsc.q=\(movieName)&gsc.page=1"
        print("\(urlStrng)")
    case 2:
         urlStrng = "https://cse.google.com/cse?cx=017716760286974932527%%3Aa5xw-xxsaic&q=vikram%%20veda&oq=vikram%%20veda&gs_l=partner.3..0.3535.6702.0.8294.11.7.0.3.3.0.688.2733.1j1j0j2j1j2.7.0.gsnos%%2Cn%%3D13...0.3027j1482321j11..1ac.1.25.partner..4.7.1281.Ja2pFYDKTV4#gsc.tab=0&gsc.q=\(movieName)%%20&gsc.page=1"
        print("\(urlStrng)")
    case 3:
        //hindi
         urlStrng = "https://www.songsmp3.co/category/search?search=\(movieName)"
        print("\(urlStrng)")
    case 4:
        //malayala
         urlStrng = "https://cse.google.com/cse?cx=017716760286974932527%%3Aa5xw-xxsaic&q=vikram%%20veda&oq=vikram%%20veda&gs_l=partner.3..0.3535.6702.0.8294.11.7.0.3.3.0.688.2733.1j1j0j2j1j2.7.0.gsnos%%2Cn%%3D13...0.3027j1482321j11..1ac.1.25.partner..4.7.1281.Ja2pFYDKTV4#gsc.tab=0&gsc.q=\(movieName)%%20&gsc.page=1"
        print("\(urlStrng)")
    case 5:
        //malayala
         urlStrng = "https://cse.google.com/cse?cx=017716760286974932527%%3Aa5xw-xxsaic&q=vikram%%20veda&oq=vikram%%20veda&gs_l=partner.3..0.3535.6702.0.8294.11.7.0.3.3.0.688.2733.1j1j0j2j1j2.7.0.gsnos%%2Cn%%3D13...0.3027j1482321j11..1ac.1.25.partner..4.7.1281.Ja2pFYDKTV4#gsc.tab=0&gsc.q=\(movieName)%%20&gsc.page=1"
        print("\(urlStrng)")
    default:break

    }
    print("\(urlStrng)")
     //urlMain = URL(string:urlStrng)
    let url : NSString = urlStrng as NSString
    let urlStr : NSString = url.addingPercentEscapes(using: String.Encoding.utf8.rawValue)! as NSString
    let searchURL : NSURL = NSURL(string: urlStr as String)!
    print(searchURL)
    let request = URLRequest(url:searchURL as URL)
    webViewMain.load(request)

}


 extension WebViewController:WKNavigationDelegate
{
    func webView(_ webView: WKWebView, didFailProvisionalNavigation navigation: WKNavigation!, withError error: Error) {

    print(error.localizedDescription)
}
func webView(_ webView: WKWebView, didStartProvisionalNavigation navigation: WKNavigation!) {
    print( webView.url)
    print("Strat to load")
}
func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
    print("finish to load")
}
public func webView(_ webView: WKWebView, didFail navigation: WKNavigation!, withError error: Error)
{
    print(error.localizedDescription)
}
 public func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: @escaping (WKNavigationActionPolicy) -> Swift.Void)
 { if (navigationAction.navigationType == .linkActivated){
    decisionHandler(.allow)
 } else {
    decisionHandler(.cancel)
    }
    print("decidepolicy")
}
public func webView(_ webView: WKWebView, didReceiveServerRedirectForProvisionalNavigation navigation: WKNavigation!)
{

        print("didreciveserver")

}

 public func webView(_ webView: WKWebView, didCommit navigation: WKNavigation!)
{

     print("didCommit")

}


    public func webView(_ webView: WKWebView, didReceive challenge: URLAuthenticationChallenge, completionHandler: @escaping (URLSession.AuthChallengeDisposition, URLCredential?) -> Swift.Void)
   {
         print("didreciveChalange")
}
@available(iOS 9.0, *)
 public func webViewWebContentProcessDidTerminate(_ webView: WKWebView)
{
     print("didTerminate")

}

它没有加载显示 2 个错误的 web 视图-：

1.) 由于未捕获的异常“NSInternalInconsistencyException”而终止应用程序，原因：“完成处理程序已通过到 -[WingsMusic.WebViewController webView:didReceiveAuthenticationChallenge:completionHandler:] 不是调用'然后我删除了完成委托，它在第一次再次显示以下错误

2.) 无法向服务 com.apple.WebKit.Networking 发出信号：113：找不到指定的服务

【问题讨论】：

除了你的错误之外，为什么 viewDidLoad() 中有这么多东西？，为什么要创建字符串对象而不是变量？为什么使用 NSString 而不是 Swift String？
com.apple.WebKit.WebContent drops 113 error: Could not find specified service的可能重复
@TusharSharma 满足进一步的需求&我是 swift 的新手，我没有字符串对象而不是变量的区别&如果我使用字符串代替 nstring，它会崩溃并且无法包装可选nill....就像那样
苹果有一个非常好的关于 swift 的文档，请阅读它你会理解一些好的东西，然后实现你的代码。通过字符串变量，我的意思是将字符串作为类型传递：var url:String?而是 var url = String()
如果我们给予有什么不同？ t 应该是可选的吧？

标签： ios swift wkwebview

【解决方案1】：

在任何情况下，您都应该为decisionPolicyFor navigationAction 返回decisionHandler。否则，你会看到上面的崩溃

【讨论】：