WKWebView从间接链接下载zip文件

Question

我正在尝试从iOS中的WKWebView捕获zip文件的下载。登录后，转到此link，请求存档并单击下载按钮，不会下载zip文件。但是，WKWebView确实在Web浏览器中显示该文件，或者似乎这样做（请参见下面的屏幕截图）。当尝试从Web视图下载文件时，我只是提取HTML文件。

有人可以提供一些方向，关于捕获和下载zip文件的正确方法吗？注意，zip文件没有直接链接。 WKWebView委托方法的代码和下面的下载处理程序。

webView didFinishNavigation

 - (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation {
    NSURLComponents *comps = [[NSURLComponents alloc] initWithURL:webView.URL

                                          resolvingAgainstBaseURL:NO];
    comps.query = nil;

    NSLog(@"did finish nav URL: %@", webView.URL);

    if ([webView.URL.absoluteString isEqualToString:LI_DOWNLOAD_URL]) {

        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 1.0 * NSEC_PER_SEC), dispatch_get_main_queue(), ^{
            [DownloadHandler downloadFileFromURL:webView.URL completion:^(NSString *filepath) {
                NSLog(@"%@",filepath);

            }];
        });
    }
    else if ([comps.string  isEqual: LI_REDIRECT_CATCH1] ||
        [comps.string  isEqual: LI_REDIRECT_CATCH2] ||
        [comps.string  isEqual: LI_REDIRECT_CATCH3]) {

        self.statusText.text = @"Tap the \"Sign In\" button to log into LinkedIn";
    }
    else if ([comps.string isEqual: LI_EXPORT_PAGE]) {
        NSString *javascript = @"javascript:" \
                                "var reqBtn = document.getElementById('request-button');" \
                                "var pndBtn = document.getElementById('pending-button');" \
                                "var dwnBtn = document.getElementById('download-button');" \
                                "if (reqBtn) {" \
                                "   window.scrollTo(reqBtn.offsetLeft, 0);" \
                                "   window.webkit.messageHandlers.dataExport.postMessage('willRequestData');" \
                                "   reqBtn.addEventListener('click', function() {" \
                                "       window.webkit.messageHandlers.dataExport.postMessage('didRequestData');" \
                                "   }, false);" \
                                "} else if (pndBtn) {" \
                                "   window.scrollTo(pndBtn.offsetLeft, 0);" \
                                "   window.webkit.messageHandlers.dataExport.postMessage('isRequestPending');" \
                                "} else if (dwnBtn) {" \
                                "   window.scrollTo(dwnBtn.offsetLeft, 0);" \
                                "   window.webkit.messageHandlers.dataExport.postMessage('willDownloadData');" \
                                "   dwnBtn.onclick = function() {" \
                                "       window.webkit.messageHandlers.dataExport.postMessage('didDownloadData');" \
                                "   };" \
                                "}";

        [self.webView evaluateJavaScript:javascript completionHandler:nil];
    }
}

下载处理程序

+ (void)downloadFileFromURL:(NSURL *)url completion:(void (^)(NSString *filepath))completion {

    NSURLSessionConfiguration *sessionConfiguration = [NSURLSessionConfiguration defaultSessionConfiguration];

    NSURLSession *session = [NSURLSession sessionWithConfiguration:sessionConfiguration];

    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    request.HTTPMethod = @"POST";

    NSURLSessionDataTask *postDataTask = [session dataTaskWithRequest:request
                                                    completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {

            if (!error) {

                dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0), ^{

                    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
                    NSString *documentsDirectory = [paths objectAtIndex:0];
                    NSString *dataPath = [documentsDirectory stringByAppendingPathComponent:@"linkedin-file-export.zip"];

                    [data writeToFile:dataPath atomically:YES];

                    completion(dataPath);
                });
            }
            else {
                NSLog(@"%@",error);

                completion([NSString string]);
            }
    }];
    [postDataTask resume];
}

我也尝试过使用UIWebView，并得到相同的结果。在Android中，这可以通过下载监听器来完成。如果它可用，我会接受这样的方法，但我不认为它在iOS中。

感谢您的帮助。

Answer 1

您正在尝试在webview完成加载zip文件网址后下载zip ..我认为该方法应该是阻止webview加载zip文件网址并允许您的API将文件下载到所需的路径。 。

如下所示。下面的代码段假定zip文件网址的扩展名为.zip

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

    NSURLRequest *request = navigationAction.request;
    NSString *fileExtension = [[request URL]absoluteString].pathExtension;
    if(fileExtension.length && [fileExtension caseInsensitiveCompare:@"zip"] == NSOrderedSame){
        //Do not load the zip url in the webview.
        decisionHandler(WKNavigationActionPolicyCancel);
        //Instead use the API to download the file
        [DownloadHandler downloadFileFromURL:[request URL] completion:^(NSString *filepath) {
            NSLog(@"%@",filepath);

        }];
    }

    //Allow all other request types to load in the webview
    decisionHandler(WKNavigationActionPolicyAllow);
}

很想知道这是否适合你。