Question

我正在使用“ webview”组件访问网站。在站点的不确定部分中，我们具有.pdf和.ppt格式的文件。用户单击这些文件时可以下载吗？今天，该应用程序仅打开.pdf和.ppt，但我想下载它。

我的代码在pt_BR中。

class PortalAcademicoViewController: UIViewController {


    @IBOutlet weak var webView: UIWebView!

    override func viewDidLoad() {
        super.viewDidLoad()

        carregaSite()

    }


    func carregaSite(){
        /*
        let url = URL(string: "")
        var urlRequest = URLRequest(url: url!)
        urlRequest.cachePolicy = .returnCacheDataElseLoad
        webView.loadRequest(urlRequest) */


        //carregar o arquivo html
        let htmlFile = Bundle.main.path(forResource: "portalacademico", ofType: "html")
        let html = try? String(contentsOfFile: htmlFile!, encoding: String.Encoding.utf8)
        HTTPCookieStorage.shared.cookieAcceptPolicy = .always
        self.webView.frame = self.view.bounds
        webView.loadHTMLString(html!, baseURL: Bundle.main.resourceURL)

        //voltar e avançar entres as paginas do webview
        let swipeLeftRecognizer = UISwipeGestureRecognizer(target: self, action: #selector(handleSwipe(recognizer:)))
        let swipeRightRecognizer = UISwipeGestureRecognizer(target: self, action: #selector(handleSwipe(recognizer:)))

        swipeLeftRecognizer.direction = .left
        swipeRightRecognizer.direction = .right

        webView.addGestureRecognizer(swipeLeftRecognizer)
        webView.addGestureRecognizer(swipeRightRecognizer)
        //fim

    }



    //trabalhando com avançar e voltar webview
    @objc private func handleSwipe(recognizer: UISwipeGestureRecognizer) {
        if (recognizer.direction == .left) {
            if webView.canGoForward {
                webView.goForward()
            }
        }

        if (recognizer.direction == .right) {
            if webView.canGoBack {
                webView.goBack()
            }
        }
    }
    //FIM

}

Answer 1

I think you should perform download task with Javascript. Check your requests in func webView(_ webView: WKWebView, decidePolicyFor navigationAction ...) and if there download request found call the javascript method.

Here is someone already done pdf download with wkwebview.

https://forums.developer.apple.com/thread/108394

Answer 2

您可以将UIWebViewDelegate设置为WebView，并在webViewShouldStartLoadWithRequest中检查PDF和PPT文件。每次用户单击链接时都会调用webViewShouldStartLoadWithRequest。

func webView(webView: UIWebView, shouldStartLoadWithRequest request: NSURLRequest, navigationType: UIWebViewNavigationType) -> Bool {

    if reqeust for a PPT or PDF file {
        downloadFile()
        return false
    }
    return true
}

https://developer.apple.com/documentation/uikit/uiwebviewdelegate/1617945-webview?language=objc

侧面说明：您当前正在使用不推荐使用的UIWebView。您应该考虑改用WKWebView。

Answer 3

使用 WKWebView 下载.pdf和.ppt或任何特定文件，请在此处查看我的解决方案

https://stackoverflow.com/a/60614921/1025070

在Swift中通过WebView下载.pdf或.ppt

3 个答案: