Controlling Animation with CAAnimation - iOS Programming: The Big Nerd Ranch Guide - page 638

[mover setFromValue:[NSValue valueWithCGPoint:CGPointMake(0.0, 100.0)]];
[mover setToValue:[NSValue valueWithCGPoint:CGPointMake(100.0, 100.0)]];
CABasicAnimation *fader = [CABasicAnimation animationWithKeyPath:@"opacity"];
[fader setDuration:1.0];
[fader setFromValue:[NSNumber numberWithFloat:1.0]];
[fader setToValue:[NSNumber numberWithFloat:1.0]];
CAAnimationGroup *group = [CAAnimationGroup animation];
[group setAnimations:[NSArray arrayWithObjects:fader, mover, nil]];
CATransition animates layers as they are transitioning on and off the screen. On Mac
OS X, CATransition is made very powerful by Core Image Filters. In iOS, it can only
do a couple of simple transitions like fading and sliding. ( CATransition is used by
UINavigationController when pushing a view controller's view onto the screen.)