Hey, just thought I'd drop a note here and thank you for this class.
I noticed that the animations stopped when I was scrolling through a UIScrollView and looked into it. I ended up adding:
inModes:[NSArray arrayWithObject:NSRunLoopCommonModes]
on line 91 : [self performSelector:@selector(runTick:) ... ];
This made the animations run even while scrolling.
Best