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实现图片动态变化效果

多张图片连续动画实现

*方案一：直接使用UIImageView来实现
示例代码如下：

UIImageView* mainImageView= [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 784, 300)];mainImageView.animationImages = [NSArray arrayWithObjects:   [UIImage imageNamed:@"icon_main_ad0.png"],[UIImageimageNamed:@"icon_main_ad1.png"],[UIImageimageNamed:@"icon_main_ad2.png"],nil];[mainImageView setAnimationDuration:9.0f];[mainImageView setAnimationRepeatCount:0];[mainImageView startAnimating];[borderView addSubview:mainImageView];[mainImageView release];

*方案二：利用定时器定时切换图片
示例代码如下：

UIImage *image = [UIImage imageNamed:@"icon_main_ad0.png"];UIImageView *imageView = [[UIImageView alloc]initWithImage:image];[imageView setFrame:CGRectMake(0, 0, 784, 300)];[self performSelector:@selector(changeImages:)withObject:imageView afterDelay:3.0];[borderView addSubview:imageView];[imageView release];
重点：
自己再定义一个改变图片的程序：
/** @DO 改变滑动图片* @param imageView 滑动视图*/
- (void) changeImages:( UIImageView *) imageView
{//这里是改变图片的程序代码，在此略去，然后递归调用自己[self performSelector:@selector(changeImages:)withObject: imageViewafterDelay:3.0];
}- (void)viewDidAppear:(BOOL)animated
{[super viewDidAppear:animated];_timer = [NSTimer scheduledTimerWithTimeInterval:5 target:self selector:@selector(changePag) userInfo:nil repeats:YES];
}
- (void)changePag
{_counttttttt ++;[_scrollView setContentOffset:CGPointMake(SCREEN_WIDTH * ((_counttttttt % 3)  + 1), 0) animated:YES];_pageControl.currentPage = _counttttttt % 3;
}- (void)viewDidLoad {[super viewDidLoad];_pageControl = [[UIPageControl alloc] init];_pageControl.numberOfPages = 3;_pageControl.bounds = CGRectMake(0, 0, 80, 20);_pageControl.center = CGPointMake(CGRectGetMidX(self.view.frame), CGRectGetHeight(_scrollView.frame) - 20);_pageControl.currentPageIndicatorTintColor = [UIColor redColor];_pageControl.userInteractionEnabled = NO;[self.view addSubview:_pageControl];}

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{_timer = [NSTimer scheduledTimerWithTimeInterval:5 target:self selector:@selector(changePag) userInfo:nil repeats:YES];if (scrollView.contentOffset.x == SCREEN_WIDTH * 4) {[scrollView setContentOffset:CGPointMake(SCREEN_WIDTH, 0) animated:NO];}else if (scrollView.contentOffset.x == 0){[scrollView setContentOffset:CGPointMake(SCREEN_WIDTH * 3, 0) animated:NO];}_pageControl.currentPage = scrollView.contentOffset.x / CGRectGetWidth(self.view.frame) - 1;}