Question

我有一个进度视图，可以跟踪通过WKWebView加载Youtube视频的状态。当它被加载时，我想要关闭progressView，因为当我点击我的应用程序的主页面时，状态栏仍然存在（但它不显示任何内容并占用空间，阻止我的应用程序的其他元素）。当完全加载progressView时，如何关闭progressView？

这是我的类，它处理WKWebView。

[AllowAnonymous]
    [HttpGet("ExportExcel")]
    public async Task<IActionResult> ExportExcel(int activos = 1, int idarticulo = -1, string filtro = "", string ordenar = "", int ordenarsentido = 1)
    {
        var memory = new MemoryStream();
        var newFile = @"Export/Articulos.xlsx";

        //IArticulosService articulosService = new ArticulosService(_validation.sConnectionString, _validation.sEmpresa);
        var mycon = _validation.GetConnectionStringFromClientID("ClientId1");
        IArticulosService articulosService = new ArticulosService(mycon, "Ciatema");

        try
        {
            // Genero el excel con el listado
            articulosService.ExportarExcel(newFile, activos, filtro, ordenar, ordenarsentido);
            using (var stream = new FileStream(newFile, FileMode.Open))
            {
                await stream.CopyToAsync(memory);
            }
            memory.Position = 0;
            return File(memory, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", newFile);
        }
        catch (QueryFormatException ex)
        {
            return BadRequest(ex.Message);
        }
        catch (Exception ex)
        {
            System.Diagnostics.Debug.WriteLine(ex);
            return StatusCode(StatusCodes.Status500InternalServerError);
        }
    }

如果您需要更多信息/更多代码，请与我们联系。

Answer 1

override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {

    guard let keyPath = keyPath else { return }

    switch keyPath {  
    case "estimatedProgress":
        // If you are using a `UIProgressView`, this is how you update the progress
        progressView.isHidden = webView.estimatedProgress == 1
        progressView.progress = Float(webView.estimatedProgress)

    default:
        break
    }
}

并且不要忘记对观察者进行取消初始化

 deinit {
    //remove all observers
    webView.removeObserver(self, forKeyPath: "estimatedProgress")
}

Answer 2

检查WKNavigationDelegate

的webView(_:didFinish:)方法

Answer 3

您必须设置可输入：

public typealias isCompletion = (_ isCompleted: Bool?) -> Void

在课堂上添加如下变量：

var completion: isCompletion?

现在你必须创建一个方法：

func webViewLoad(_ iscompleted:@escaping isCompletion){
    completion = iscompleted
    let url = URL(string: videoURL)!
    webView.load(URLRequest(url: url))
    webView.allowsBackForwardNavigationGestures = true
}

您必须在委托方法中设置完成

func webView(webView: WKWebView, didFinishNavigation navigation: WKNavigation!) {
    print("finish to load")
    completion(true)
}

您可以从viewdidload中调用此方法，如下所示：

    // show loading from here
    webViewLoad { (flag) in

    //hide loading here

    }

完全加载后如何解除progressView？

3 个答案: