UIActivityViewController在MonoTouch中泄漏/内存问题

Question

我正在尝试在MonoTouch中使用UIActivityViewController。您可以在下面看到代码。我的问题是代码泄漏（根据monotouch内存分析器）并且由于每次显示视图控制器时加载的图像而使用大量内存。我试图实施解决方案：

NSArray* excludedActivities Leaks memory even when using ARC and setting it to nil

How to fix memory leak for UIActivityViewController presented in a UIPopoverController

并将活动视图控制器和图像配置在完成处理程序中，但我总是遇到同样的问题。有人有同样的问题并找到解决方案吗？

void OnButtonClicked(object sender, EventArgs e)
{
  UIImage image = UIImage.FromFile("imagePath");

  NSObject[] activityItems = new NSObject[] {
    new NSString("text"),
    image
  };

  UIActivityViewController activityController = new UIActivityViewController(activityItems, null);
  activityController.ExcludedActivityTypes = new NSString[] {UIActivityType.Message};
  activityController.CompletionHandler = (activityType, completed) =>
  {
    activityController.ExcludedActivityTypes = null;
    activityController.Dispose();
    activityController = null;

    image.Dispose(); 
    image = null;
  };
  this.NavigationController.PresentViewController(activityController, true, () => {});
}