An easy to use loading indicator for iOS.
Easiest was, as always, is to add this to your Podfile:
"pod 'JALoadingView', :git => 'https://github.com/jenshandersson/JALoadingView.git"
All you need to do is call -startAnimating and -stopAnimating.
[JALoadingView startAnimating];
...
Do crazy stuff
...
[JALoadingView stopAnimating];