Problem to take Pictures (Acr.XamForms)

I'm trying to take pictures using Acr.XamForms. Follow the sample I've wrote that:

if (mediaPickerService.IsCameraAvailable || mediaPickerService.IsPhotoGalleryAvailable)
{
var options = new CameraOptions
{ Camera = CameraDevice.Rear };

            var photo = await mediaPickerService.TakePhoto(options);
        }

Debug in my iPhone, after took the picture the UI freeze.

What I need to do ?? How do I capture the image when it back from the camera view to my app ??

Thanks!