ios 8.4.1 webview黑色屏幕

问题描述：

我需要在一个简单的web视图中的iOS应用程序。我用example最近升级了ios 8.4.1。升级后，应用程序停止工作，显示黑屏。ios 8.4.1 webview黑色屏幕

import UIKit 
import WebKit 

class ViewController: UIViewController, WKNavigationDelegate { 
    var webView: WKWebView? 

    /* Start the network activity indicator when the web view is loading */ 
    func webView(webView: WKWebView, 
    didStartProvisionalNavigation navigation: WKNavigation){ 
     UIApplication.sharedApplication().networkActivityIndicatorVisible = true 
    } 

    /* Stop the network activity indicator when the loading finishes */ 
    func webView(webView: WKWebView, 
    didFinishNavigation navigation: WKNavigation){ 
     UIApplication.sharedApplication().networkActivityIndicatorVisible = false 
    } 

    func webView(webView: WKWebView, 
    decidePolicyForNavigationResponse navigationResponse: WKNavigationResponse, 
    decisionHandler: ((WKNavigationResponsePolicy) -> Void)){ 

     print(navigationResponse.response.MIMEType) 

     decisionHandler(.Allow) 

    } 

    override func viewDidLoad() { 
    super.viewDidLoad() 

    /* Create our preferences on how the web page should be loaded */ 
    let preferences = WKPreferences() 
    preferences.javaScriptEnabled = false 

    /* Create a configuration for our preferences */ 
    let configuration = WKWebViewConfiguration() 
    configuration.preferences = preferences 

    /* Now instantiate the web view */ 
    webView = WKWebView(frame: view.bounds, configuration: configuration) 

    if let theWebView = webView{ 
     /* Load a web page into our web view */ 
     let url = NSURL(string: "http://www.apple.com") 
     let urlRequest = NSURLRequest(URL: url!) 
     theWebView.loadRequest(urlRequest) 
     theWebView.navigationDelegate = self 
     view.addSubview(theWebView) 

    } 

    } 

}

如果有任何示例代码？

谢谢。

答

我在我们的应用程序类似的问题发生。这是我如何解决它在Objective-C：

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType { 

    NSLog(@"request.URL.scheme: %@", request.URL.scheme); 

    BOOL calledForReload = NO; 

    if ([[request.URL.scheme lowercaseString] isEqualToString:@"about"]) { 
     //have we used reload yet? 
     if (!calledForReload) { 
      calledForReload = YES; 
      [webView reload]; 
     } else { 
      // other response 
      // decide what you wish to do if you get another about:blank 
     } 
    } 

return YES; 
}

基本上我看到的iOS 8.4.1 UIWebView突然叫about:blank作为第一个URL。我的解决方案是检查about:blank并要求UIWebView仅在第一次时重新加载。

答案不在SWIFT中，但希望解决方案逻辑很容易转换为您的代码。

答

当谷歌翻译触发我的WKWebView在执行回调后呈现空白页面时，可以考虑这一点。这里是一个iOS 10，与@dredful相同的快速版本 - 这似乎掩盖了我所看到的问题：

func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: @escaping (WKNavigationActionPolicy) -> Void) { 
    if "about" == navigationAction.request.url?.scheme { 
     decisionHandler(.cancel); 
     webView.reload() 
    } 
}

ios 8.4.1 webview黑色屏幕

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