It Custom UIActivityIndicator
that you can found in this link
https://github.com/jdg/MBProgressHUD
MBProgressHUD
is an iOS drop-in class that displays a translucent HUD with an indicator and/or labels while work is being done in a background thread. The HUD is meant as a replacement for the undocumented, private UIKit UIProgressHUD with some additional features.......
For mor information go to above Link
Thanks :)