I haven\'t found any references to apps that use a custom activity indicator -- would be an animated GIF old-school -- in place of the Apple-supplied spinning wheels. Are th
Or you can use an animation to rotate the layer. Here is an interesting post about how to do that :
http://www.cimgf.com/2008/10/25/core-animation-tutorial-slider-based-layer-rotation/
Hope this helps.
Thierry