假设想要循环播放的话, scrollView的照片前要加上最后一张图片, 最后要加上第一张图片.

- (void)viewDidLoad {

    [super viewDidLoad];

    // Do any additional setup after loading the view.

    //继承于UIView,能够通过创建view的四步对ScrollView进行创建.

    UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];

    scrollView.backgroundColor = [UIColor orangeColor];

    [self.view addSubview:scrollView];

    [scrollView release];

    //重要的属性,这个属性能够让scrollView滚动起来

    //contentSize 设置scrolloView的滚动范围:

    scrollView.contentSize = CGSizeMake(WIDTH* 12, HEIGHT );

    //按页来进行滚动

    scrollView.pagingEnabled = YES;

    // 显示图片

    UIImageView *imageview1 = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"10.jpg"]];

    imageview1.frame = CGRectMake(0, 0, WIDTH, HEIGHT);

    [scrollView addSubview:imageview1];

    [imageview1 release];

    for (NSInteger i = 1 ; i < 11; i++) {

        NSString *picName = [NSString stringWithFormat:@"%ld.jpg",i];

        // 通过图片名创建UIImage

        UIImageView *imageView  = [[UIImageView alloc] initWithImage:[UIImage imageNamed:picName]];

        imageView.frame  = CGRectMake(WIDTH * i, 0, WIDTH, HEIGHT);

        // 把ImageView放到相应的scrollView上

        [scrollView addSubview:imageView];

        [imageView release];

    }

    UIImageView *imageViewLast = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"1.jpg"]];

    [scrollView addSubview:imageViewLast];

    imageViewLast.frame = CGRectMake(WIDTH * 11,0, WIDTH, HEIGHT);

    [imageViewLast release];

    scrollView.delegate = self;

    scrollView.tag = 1000;

    scrollView.bounces = NO;

    scrollView.contentOffset = CGPointMake(WIDTH, 0);

    [NSTimer scheduledTimerWithTimeInterval:1.5 target:self selector:@selector(change) userInfo:nil repeats:YES];

}

// 这个是与NSTimer 结合,直接自己主动循环播放.

- (void)change{

    UIScrollView *scrollview = (UIScrollView *)[self.view viewWithTag:1000];

    [scrollview setContentOffset:CGPointMake(scrollview.contentOffset.x + WIDTH,0) animated:YES];

    if (scrollview.contentOffset.x

         == WIDTH * 11) {

        scrollview.contentOffset = CGPointMake(WIDTH, 0);

    }

}

若是想要滑动循环播放,须要用到协议方法, 不要忘了在上面签订协议并设定代理人.

使用NSTimer 后,就不会再走协议中的方法啦.所以偏移量的设定,在NSTimer中再又一次做改动.

- (void)scrollViewDidScroll:(UIScrollView *)scrollView{

}

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{

    // 偏移量.

    if (scrollView.contentOffset.x == 0) {

        scrollView.contentOffset = CGPointMake(WIDTH * 10,0);

    }else if(scrollView.contentOffset.x == WIDTH * 10){

        scrollView.contentOffset = CGPointMake(WIDTH, 0);

    }

}