private Task <MediaFile> GetMediaAsync(UIImagePickerControllerSourceType sourceType, string mediaType, CameraFacingDirection cameraFacingDirection, StoreMediaOptions options = null)
{
var window = UIApplication.SharedApplication.KeyWindow;
if (window == null)
{
throw new InvalidOperationException("There's no current active window");
}
var viewController = window.RootViewController;
if (viewController == null)
{
window = UIApplication.SharedApplication.Windows.OrderByDescending(w => w.WindowLevel).FirstOrDefault(w => w.RootViewController != null);
if (window == null)
{
throw new InvalidOperationException("Could not find current view controller");
}
else
{
viewController = window.RootViewController;
}
}
while (viewController.PresentedViewController != null)
{
viewController = viewController.PresentedViewController;
}
MediaPickerDelegate ndelegate = new MediaPickerDelegate(viewController, sourceType, options);
var od = Interlocked.CompareExchange(ref this.pickerDelegate, ndelegate, null);
if (od != null)
{
throw new InvalidOperationException("Only one operation can be active at at time");
}
var picker = SetupController(ndelegate, sourceType, mediaType, cameraFacingDirection, options);
if (UIDevice.CurrentDevice.UserInterfaceIdiom == UIUserInterfaceIdiom.Pad && sourceType == UIImagePickerControllerSourceType.PhotoLibrary)
{
ndelegate.Popover = new UIPopoverController(picker);
ndelegate.Popover.Delegate = new MediaPickerPopoverDelegate(ndelegate, picker);
ndelegate.DisplayPopover();
}
else
{
viewController.PresentViewController(picker, true, null);
}
return(ndelegate.Task.ContinueWith(
t =>
{
if (this.popover != null)
{
this.popover.Dispose();
this.popover = null;
}
Interlocked.Exchange(ref this.pickerDelegate, null);
return t;
}).Unwrap());
}