- (void)viewDidLoad{    [super viewDidLoad];// Do any additional setup after loading the view, typically from a nib.    //定义UIScrollView    //self.scrollView = [[UIScrollView alloc] init];    //self.scrollView.frame = CGRectMake(10, 0, 200, 500);    self.scrollView.contentSize = CGSizeMake(1000,288);  //scrollview的滚动范围    self.scrollView.showsVerticalScrollIndicator = NO;    self.scrollView.showsHorizontalScrollIndicator = NO;    //myScrollView.clipsToBounds = YES;    self.scrollView.delegate = self;    self.scrollView.scrollEnabled = YES;    self.scrollView.pagingEnabled = YES; //使用翻页属性    self.scrollView.bounces = NO;        for(int i=0;i<4;i++)    {        UIImageView *imageV =[[UIImageView alloc]initWithImage:[UIImage imageNamed:@"wel2.png"]];        [imageV setFrame:CGRectMake(200*i, 0, 192, 288)];        [self.scrollView addSubview:imageV];            }    //定义PageControll    self.pageControl.numberOfPages = 4;//指定页面个数    self.pageControl.currentPage = 0;//指定pagecontroll的值，默认选中的小白点（第一个）    [self.pageControl addTarget:self action:@selector(changePage:) forControlEvents:UIControlEventValueChanged];}//scrollview的委托方法，当滚动时执行- (void)scrollViewDidScroll:(UIScrollView *)sender {    int page = self.scrollView.contentOffset.x / 192;//通过滚动的偏移量来判断目前页面所对应的小白点    self.pageControl.currentPage = page;//pagecontroll响应值的变化}- (IBAction)changePage:(id)sender {    int page = self.pageControl.currentPage;//获取当前pagecontroll的值    self.label1.text = [[NSString alloc]initWithFormat:@"%d",page];    [self.scrollView setContentOffset:CGPointMake(200 * page, 0)];//根据pagecontroll的值来改变scrollview的滚动位置，以此切换到指定的页面   }