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);
}
}