Xamarin.iOS UIDocumentPickerViewController

Question

我有一个关于iOS文档选择器的问题。

我已经包括了iCloud容器/为我们的配置启用了iCloud。还为Xamarin.iOS本身添加了所需的Xamarin.iOS需求。但是，我在启动popover菜单以显示iOS的浏览文件菜单时遇到了问题。

var documentPicker = new UIDocumentPickerViewController(allowedUtis, UIDocumentPickerMode.Import);

documentPicker.DidPickDocument += DocumentPicker_DidPickDocument;
documentPicker.WasCancelled += DocumentPicker_WasCancelled;
documentPicker.DidPickDocumentAtUrls += DocumentPicker_DidPickDocumentAtUrls;
documentPicker.WasCancelled += DocumentPicker_WasCancelled;

private void DocumentPicker_DidPickDocumentAtUrls(object sender, UIDocumentPickedAtUrlsEventArgs e)
{
     var control = (UIDocumentPickerViewController)sender;
     foreach (var url in e.Urls)
         DocumentPicker_DidPickDocument(control, new UIDocumentPickedEventArgs(url));

         control.Dispose();
}

似乎事件DidPickDocument / DidPickDocumentAtUrls事件不会启动，除了设置供应、权利、info.plist之外，是否还有其他必要的选项/权限可供我使用iOS的文档选择器？

Answer 1

我最近这样做了，它在我的xamarin表单应用程序中运行得很好：

private void ShowDocsPicker()
    {
        try
        {
            var docPicker = new UIDocumentPickerViewController(new string[]
            { UTType.Data, UTType.Content }, UIDocumentPickerMode.Import);
            docPicker.WasCancelled += DocPicker_WasCancelled;
            docPicker.DidPickDocumentAtUrls += DocPicker_DidPickDocumentAtUrls;
            var _currentViewController = GetCurrentUIController();
            if (_currentViewController != null)
                _currentViewController.PresentViewController(docPicker, true, null);
        }
        catch (Exception ex)
        {
          //Exception Logging
        }
    }

获取当前的UIViewController，如下所示：

  public UIViewController GetCurrentUIController()
    {
        UIViewController viewController;
        var window = UIApplication.SharedApplication.KeyWindow;
        if (window == null)
        {
            return null;
        }

        if (window.RootViewController.PresentedViewController == null)
        {
            window = UIApplication.SharedApplication.Windows
                     .First(i => i.RootViewController != null &&
                                 i.RootViewController.GetType().FullName
                                 .Contains(typeof(Xamarin.Forms.Platform.iOS.Platform).FullName));
        }

        viewController = window.RootViewController;

        while (viewController.PresentedViewController != null)
        {
            viewController = viewController.PresentedViewController;
        }

        return viewController;
    }

然后添加文档选择的事件，如下所示：

 private void DocPicker_DidPickDocumentAtUrls(object sender, UIDocumentPickedAtUrlsEventArgs e)
    {
     //Action to perform on document pick
    }

在出现查询时恢复。