正在下载文件 WKWebView ios

Question

我正在将我的应用程序从 UIWebView 迁移到 WKWebView。随着我对它进行更多的修改，一切都进展顺利并且工作正常。但是，我现在发现我无法下载论坛附件。

我正在使用 HCDownload，到目前为止对我来说一直是完美的，所以我知道它不是那一端。我相信这是要求，但我想不通。

我知道以下内容：

UIWebView => WKWebView Equivalent
--------------------------------------------------------------
didFailLoadWithError => didFailNavigation
webViewDidFinishLoad => didFinishNavigation
webViewDidStartLoad => didStartProvisionalNavigation
shouldStartLoadWithRequest => decidePolicyForNavigationAction

所以我正在尝试下面的已知内容：

- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {

    NSURLRequest *request = navigationAction.request;
    NSURL *fileURl = [request URL];
    NSString *externalFileExtension = [fileURl pathExtension];
    NSString *internalFileExtension = [[fileURl absoluteString] pathExtension];

    HCDownloadViewController *dlvc = [[HCDownloadViewController alloc] init];
    UINavigationController *vc = [[UINavigationController alloc] initWithRootViewController:dlvc];
    dlvc.delegate = self;
    vc.transitioningDelegate  = self;

    if (navigationAction.navigationType == WKNavigationTypeLinkActivated) {

        //External file extensions
        if ([fileExtensions containsObject:[externalFileExtension lowercaseString]]) {
            [dlvc downloadURL:fileURl userInfo:nil];
            [self presentViewController:vc animated:YES completion:nil];
            [vc release];

            NSLog(@"externalURL is %@", fileURl);
            decisionHandler(WKNavigationActionPolicyCancel);
            return;
        }

        //Internal file links
        if ([fileExtensions containsObject:[internalFileExtension lowercaseString]]) {
            [self presentViewController:vc animated:YES completion:nil];
            [dlvc downloadURL:fileURl userInfo:nil];
            [vc release];

            NSLog(@"internalURL is %@", fileURl);
            decisionHandler(WKNavigationActionPolicyCancel);
            return;

        }
}

它会通过找到文件扩展名来触发我的下载控制器，但它会下载 index.php，而不是文件。

示例url：

https://example.com/index.php?app=core&module=attach&section=attach&attach_id=1234=example.zip;

我做错了什么。它之前在 UIWebView 中运行良好，我知道事情的完成方式有所不同。但是它怎么能从 say dropbox 下载东西就好了，但是论坛上的附件却搞砸了。

如有任何帮助，我们将不胜感激

Answer 1

您可能正在下载 not-authorized 页面，因为您的 WKWebView 和 HCDownload 实例不会像 UIWebView 那样共享 cookie 会话。这是 WK2 流程模型的速度和安全改进所必需的 trade-off。

我 added downloading 到我的 WKWebKit-based OSX/Swift mini-browser 通过实施 _WKDownloadDelegate。它是 El Cap 和 iOS9 的完全未记录的私有协议。它让您的导航委托调用 decisionHandler(_WKNavigationResponsePolicyBecomeDownload)，WebKit 将在给您机会 pick/change 文件名后在后台下载。我还没有关于如何在 iOS 中实现文件选择器的最模糊的想法，也不知道 App Store 审阅者是否允许使用该协议。但我的应用程序现在可以正确处理从 session-authentication 网站（例如您的 PHP 论坛）的下载。

Answer 2

这就是我最终得到的结果，一切似乎都运行良好。

- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler{
    NSHTTPURLResponse *response = (NSHTTPURLResponse *)navigationResponse.response;
    NSArray *cookies =[NSHTTPCookie cookiesWithResponseHeaderFields:[response allHeaderFields] forURL:response.URL];
    for (NSHTTPCookie *cookie in cookies) {
        [[NSHTTPCookieStorage sharedHTTPCookieStorage] setCookie:cookie];
    }

    decisionHandler(WKNavigationResponsePolicyAllow);
    //NSLog(@"decidePolicyForNavigationResponse");
}


//Download manager
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {

    NSURLRequest *request = navigationAction.request;
    fileURL = request.URL;

    HCDownloadViewController *dlvc = [[HCDownloadViewController alloc] init];
    UINavigationController *vc = [[UINavigationController alloc] initWithRootViewController:dlvc];
    vc.transitioningDelegate  = self;
    dlvc.delegate = self;

    if (navigationAction.navigationType == WKNavigationTypeLinkActivated) {

        //Internal file links
        NSString *internalFileExtension = fileURL.absoluteString.pathExtension;
        if ([fileExtensions containsObject:[internalFileExtension lowercaseString]]) {

            //Fire download
            [dlvc downloadURL:fileURL userInfo:nil];
            [self presentViewController:vc animated:YES completion:nil];
            [vc release];

            NSLog(@"internalURL is %@", fileURL);
            if (decisionHandler) {
                decisionHandler(WKNavigationActionPolicyCancel);
            }
            return;
        }

        //External file extensions
        NSString *externalFileExtension = fileURL.pathExtension;
        if ([fileExtensions containsObject:[externalFileExtension lowercaseString]]) {

            //Fire download
            [dlvc downloadURL:fileURL userInfo:nil];
            [self presentViewController:vc animated:YES completion:nil];
            [vc release];

            NSLog(@"externalURL is %@", fileURL);
            if (decisionHandler) {
                decisionHandler(WKNavigationActionPolicyCancel);
            }
            return;
        }
    }

    if (decisionHandler) {
        decisionHandler(WKNavigationActionPolicyAllow);
    }
}

Answer 3

Swift 4:

ChrisOSX 的解决方案也解决了我的问题。登录该站点后，我正在尝试从该站点的 link 下载文档。我用过WKZombie to scrape the link, and then I wanted to download the file using Alamofire。我添加了这个

if let httpResponse = navigationResponse.response as? HTTPURLResponse, let url = httpResponse.url {
    let allHeaders = httpResponse.allHeaderFields.reduce([String : String](), { (result, next) -> [String : String] in
    guard let stringKey = next.key as? String, let stringValue = next.value as? String else { return result }
        var buffer = result
        buffer[stringKey] = stringValue
        return buffer
    })
    let cookies = HTTPCookie.cookies(withResponseHeaderFields: allHeaders, for: url)
    for cookie in cookies {
        HTTPCookieStorage.shared.setCookie(cookie)
    }
}

至：

func webView(_ webView: WKWebView, decidePolicyFor navigationResponse: WKNavigationResponse, decisionHandler: @escaping (WKNavigationResponsePolicy) -> Void)

在此之后，cookie 存储在共享 cookie 中，我可以使用 Alamofire 下载文件，而无需更改下载方法..

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