private Task <MediaFile> GetMediaAsync(UIImagePickerControllerSourceType sourceType, string mediaType, StoreCameraMediaOptions options = null)
{
UIViewController viewController = null;
var window = UIApplication.SharedApplication.KeyWindow;
if (window == null)
{
throw new InvalidOperationException("There's no current active window");
}
if (window.WindowLevel == UIWindowLevel.Normal)
{
viewController = window.RootViewController;
}
if (viewController == null)
{
window = UIApplication.SharedApplication.Windows.OrderByDescending(w => w.WindowLevel).FirstOrDefault(w => w.RootViewController != null && w.WindowLevel == UIWindowLevel.Normal);
if (window == null)
{
throw new InvalidOperationException("Could not find current view controller");
}
viewController = window.RootViewController;
}
while (viewController.PresentedViewController != null)
{
viewController = viewController.PresentedViewController;
}
var ndelegate = new MediaPickerDelegate(viewController, sourceType, options);
var od = Interlocked.CompareExchange(ref _PickerDelegate, ndelegate, null);
if (od != null)
{
throw new InvalidOperationException("Only one operation can be active at at time");
}
var picker = SetupController(ndelegate, sourceType, mediaType, options);
if (UIDevice.CurrentDevice.UserInterfaceIdiom == UIUserInterfaceIdiom.Pad && sourceType == UIImagePickerControllerSourceType.PhotoLibrary)
{
ndelegate.Popover = new UIPopoverController(picker)
{
Delegate = new MediaPickerPopoverDelegate(ndelegate, picker)
};
ndelegate.DisplayPopover();
}
else
{
if (UIDevice.CurrentDevice.CheckSystemVersion(9, 0))
{
picker.ModalPresentationStyle = UIModalPresentationStyle.OverCurrentContext;
}
viewController.PresentViewController(picker, true, null);
}
return(ndelegate.Task.ContinueWith(t =>
{
if (_Popover != null)
{
_Popover.Dispose();
_Popover = null;
}
Interlocked.Exchange(ref _PickerDelegate, null);
return t;
}).Unwrap());
}
internal MediaPickerPopoverDelegate(MediaPickerDelegate pickerDelegate, UIImagePickerController picker)
{
_PickerDelegate = pickerDelegate;
_Picker = picker;
}