iOS JavaScript POST 从 UIWebView 迁移到 WKWebView

iOS Migration from UIWebView to WKWebView for JavaScript POST

我正在 Swift 中的原生 iOS 应用程序中实施安全支付解决方案。

基本上当我开始付款请求时,如果支付卡已注册 3D 支票,我会在响应中收到 "PaReq" 和 "ACSURL"。

然后我需要做 java 脚本 POST。

一旦用户完成操作,我需要提取 "PaRes" 并在下一次服务调用中发送。

这是 Objective-C 中的工作解决方案,使用 UIWebView.I 想要在 Swift 中实现同样的事情,不推荐使用 WKWebView 作为 UIWebView。

- (void)viewDidLoad {
    [super viewDidLoad];

    UIWebView *webView=[[UIWebView alloc]initWithFrame:CGRectMake(0, 0, self.secureViewContainer.frame.size.width ,self.secureViewContainer.frame.size.height)];
    webView.delegate = self;
    [self.view addSubview:webView];

    NSString *termURL = @"https://www.apple.com";

    self.webViewURL = @"";
    self.webViewHTMLString = [NSString stringWithFormat:@"<html><body><form name='redirectToIssuerForm' id='redirectToIssuerForm' action='%@' method='post'><input type='hidden' name='PaReq' value='%@' /><input type='hidden' name='TermUrl' value='%@' /><input type='hidden' name='MD' value='' /><input type='submit' id='submitButton' value='Click here to continue' /></form><script>function submitForm(){document.getElementById('submitButton').style.display='none'; document.getElementById('submitButton').click();} window.onload = (function(){submitForm();});</script></body></html>",self.acsurl,self.pareq,termURL];

    [webView loadHTMLString:self.webViewHTMLString baseURL:nil];

}

- (void)webViewDidFinishLoad:(UIWebView *)webView{

    if([webView.request.URL.absoluteString isEqualToString:@"about:blank"]){
        [webView stringByEvaluatingJavaScriptFromString:@"submitForm()"];
    }
}

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

    if([ [NSString stringWithFormat:@"%@",request.URL] isEqualToString:@"https://www.apple.com/"]){ 

    NSData *data = request.HTTPBody;

    NSString *dataString = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding];

    NSLog(@"\n\n\n  3D Secure - dataString: %@", dataString);

        return NO;
    }
    else{

        return YES;

    }
}

这是我尝试使用 WKWebView 迁移到 Swift 的内容:

override func viewDidLoad() {

    super.viewDidLoad()

    let webConfiguration = WKWebViewConfiguration()
    let customFrame = CGRect.init(origin: CGPoint.zero, size: CGSize.init(width: 0.0, height: self.secureViewContainer.frame.size.height))
    self.webView = WKWebView (frame: customFrame , configuration: webConfiguration)
    webView.uiDelegate = self
    webView.navigationDelegate = self
    self.secureViewContainer.addSubview(webView)          
}
override func viewWillAppear(_ animated: Bool) {

    super.viewWillAppear(animated)
    let termURLString = "https://www.apple.com"
    var paReqString = response.PaRequest
    var acsurlString = response.ACSURL

    // create HTML String 

    let webViewHTMLString = String(format:"<html><body><form name='redirectToIssuerForm' id='redirectToIssuerForm' action='%@' method='post'><input type='hidden' name='PaReq' value='%@' /><input type='hidden' name='TermUrl' value='%@' /><input type='hidden' name='MD' value='' /><input type='submit' id='submitButton' value='Click here to continue' /></form><script>function submitForm(){document.getElementById('submitButton').style.display='none'; document.getElementById('submitButton').click();} window.onload = (function(){submitForm();});</script></body></html>",acsurlString,paReqString,termURLString)

        // Load HTML String
        webView.loadHTMLString(webViewHTMLString, baseURL: nil)
 }

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

    if webView.url?.absoluteString == "about:blank" {

        webView.evaluateJavaScript("submitForm()", completionHandler: {
            result in

            print("\n\n\n Result - \(result)\n\n\n")

        })
    }

}

func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: @escaping (WKNavigationActionPolicy) -> Void) {

    if let url = navigationAction.request.url,url.absoluteString.hasPrefix("https://www.apple.com/") {
        let data = navigationAction.request.httpBody

        print("\n\n  data : \(String(describing: data))")

        decisionHandler(.cancel)
        return
    }
    decisionHandler(.allow)
}

问题是 "Result" 和 "data" 都为零。

1:我会在 webView(_:decidePolicyFor:decisionHandler:)(或)webView:didFinishNavigation 中得到 java 脚本结果吗?

2:在 UIWebView 工作解决方案中,我可以将 termURL 更改为任何 url,例如“https://www.apple.com”,但我仍然可以很好地获取数据,有人可以向我解释一下这个 Javascript POST 有效吗?

3:请指向 guide/tutorial 以了解有关 JavaScript 和本机 iOS 应用交互的更多信息。

  1. 您在 func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) 中得到结果,但 仅在 completionHandler 闭包中 ,而不是 function-wide。

  2. 如我所见,termURL 只是表单的一些隐藏输入字段的内容。它的值在提交表单时传递 - 但它与提交到的位置无关。

  3. 这个好像不错,但是基本intro into WkWebViews. And there's this blog post about WkWebView JavaScript Quirks.

看来您的方向是正确的。 I recently wrote an article on this subject, and that should explain everything you need.

首先,如果您想从 javascript 代码向本机代码发送内容,您需要在 javascript 代码中使用 window.webkit。您需要在 swift 代码中实现 WKScriptMessageHandler 和 WKNavigationDelegate,并实现此功能:

func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {
    //This function handles the events coming from javascript.
    //We can access properties through the message body, like this:
    guard let response = message.body as? String else { return }
    print(response)
}

文章中有更多相关信息。

您将进行的所有发送都将通过 webview.evaluateJavascript()。确保 javascript 功能正常工作,因为 webkit 错误不会显示在您的 Xcode 控制台中。您必须为此实现自定义 messageHandler。