.DismissModalViewController closes all my pages. Why? - ios

Question

I am using an image picker in my xamarin forms in order to pick an image from gallery to my program...
But, only in IOS device, when I close the image picker using
imagePicker.DismissModalViewController(true);
all my pop ups that is opened are closed with the imagePicker...
Does someone know why? or how I can solve that?
I am using DependencyService to do that in both
This is the code in IOS project
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Foundation;
using UIKit;
using neoFly_Montana.iOS;
using Xamarin.Forms;
using neoFly_Montana.Interface;
using System.Threading.Tasks;
using System.IO;
[assembly: Dependency(typeof(PicturePickerImplementation))]
namespace neoFly_Montana.iOS
{
public class PicturePickerImplementation : IPicturePicker
{
TaskCompletionSource<Stream> taskCompletionSource;
UIImagePickerController imagePicker;
public Task<Stream> GetImageStreamAsync()
{
// Create and define UIImagePickerController
imagePicker = new UIImagePickerController
{
SourceType = UIImagePickerControllerSourceType.PhotoLibrary,
MediaTypes = UIImagePickerController.AvailableMediaTypes(UIImagePickerControllerSourceType.PhotoLibrary)
};
// Set event handlers
imagePicker.FinishedPickingMedia += OnImagePickerFinishedPickingMedia;
imagePicker.Canceled += OnImagePickerCancelled;
// Present UIImagePickerController;
UIWindow window = UIApplication.SharedApplication.KeyWindow;
var viewController = window.RootViewController;
viewController.PresentModalViewController(imagePicker, true);
// Return Task object
taskCompletionSource = new TaskCompletionSource<Stream>();
return taskCompletionSource.Task;
}
void OnImagePickerFinishedPickingMedia(object sender, UIImagePickerMediaPickedEventArgs args)
{
UIImage image = args.EditedImage ?? args.OriginalImage;
if (image != null)
{
// Convert UIImage to .NET Stream object
NSData data = image.AsJPEG(1);
Stream stream = data.AsStream();
// Set the Stream as the completion of the Task
taskCompletionSource.SetResult(stream);
}
else
{
taskCompletionSource.SetResult(null);
}
imagePicker.DismissModalViewController(true);
}
void OnImagePickerCancelled(object sender, EventArgs args)
{
taskCompletionSource.SetResult(null);
imagePicker.DismissModalViewController(true);
}
}
}
I am using RG.PLUGIN.POPUP