iOS: 动画更换 UIImageView 的 Image

#import <QuartzCore/QuartzCore.h>
...
imageView.image = [UIImage imageNamed:(i % ) ? @"3.jpg" : @"4.jpg"];

CATransition *transition = [CATransition animation];
transition.duration = 1.0f;
transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
transition.type = kCATransitionFade;

[imageView.layer addAnimation:transition forKey:nil];

链接：http://stackoverflow.com/a/2834693（Stack Overflow）