Xamarin iOS: How can I open a pdf file using a standard reader - xamarin.forms

Question

I need to open a pdf file using a default reader, android works, but for iOS i can not. And I do not have a solid experience with C # only 2 months
public void SaveOpen(string filename, MemoryStream stream)
{
string path = Environment.GetFolderPath(Environment.SpecialFolder.Personal);
string filePath = Path.Combine(path, filename);
//Create a file and write the stream into it.
FileStream fileStream = File.Open(filePath, FileMode.Create);
stream.Position = 0;
stream.CopyTo(fileStream);
fileStream.Flush();
fileStream.Close();
UIViewController currentController = UIApplication.SharedApplication.KeyWindow.RootViewController;
while (currentController.PresentedViewController != null)
currentController = currentController.PresentedViewController;
UIView currentView = currentController.View;
}

Answer 1

To open a pdf file from a filePath:
public void OpenPDF(string filePath)
{
FileInfo fi = new FileInfo(filePath);
QLPreviewController previewController = new QLPreviewController();
previewController.DataSource = new PreviewControllerDataSource(fi.FullName, fi.Name);
UINavigationController controller = FindNavigationController();
if (controller != null)
controller.PresentViewController(previewController, true, null);
}
private UINavigationController FindNavigationController()
{
foreach (var window in UIApplication.SharedApplication.Windows)
{
if (window.RootViewController.NavigationController != null)
{
return window.RootViewController.NavigationController;
}
var value = CheckSubs(window.RootViewController.ChildViewControllers);
if (value != null)
return value;
}
return null;
}
private UINavigationController CheckSubs(UIViewController[] controllers)
{
foreach (var controller in controllers)
{
if (controller.NavigationController != null)
{
return controller.NavigationController;
}
var value = CheckSubs(controller.ChildViewControllers);
return value;
}
return null;
}
So, in your code, after saving it, just call OpenPDF with the correct path.