利用UIImageView实现动画 .

- (void)viewDidLoad {
[super viewDidLoad];

UIImageView *fishAni=[[UIImageView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
[self.view addSubview:fishAni];
[fishAni release];

//设置动画帧
fishAni.animationImages=[NSArray arrayWithObjects:
[UIImage imageNamed:@"1.jpg"],
[UIImage imageNamed:@"2.jpg"],
[UIImage imageNamed:@"3.jpg"],
[UIImage imageNamed:@"4.jpg"],
[UIImage imageNamed:@"5.jpg"],nil ];

//设置动画总时间
fishAni.animationDuration=1.0;

//设置重复次数，0表示不重复
fishAni.animationRepeatCount=0;

//开始动画
[fishAni startAnimating];    
}