向模态视图添加UIActivityIndicator (ELCimagepicker)

I've added the ELCimagepicker (https://github.com/Fingertips/ELCImagePickerController) to my project and it works perfectly, allowing the user to select multiple images for a slideshow. But when you click 'Save', there can be a lengthy delay depending on how many photos were added.I've added the ELCimagepicker (https://github.c