UIScrollView和UIPageControl实现图片切换

啥也不说了，很简单，直接贴代码：

-(void)initUI

{

    static int nPageCtrlH = 30;

    CGRect rc = self.frame;

    CGRect scrollRc = CGRectMake(0, 0, rc.size.width, rc.size.height - nPageCtrlH);

    CGRect pageRc = CGRectMake(0, scrollRc.size.height, rc.size.width, nPageCtrlH);

    

    

    m_scrollView = [[UIScrollView alloc]initWithFrame:scrollRc];

    m_scrollView.pagingEnabled = YES;

    m_scrollView.showsHorizontalScrollIndicator = NO;

    m_scrollView.showsVerticalScrollIndicator = NO;

    m_scrollView.scrollsToTop = NO;

    m_scrollView.delegate = self;

    [self addSubview:m_scrollView];

    

    

    m_pageControl = [[UIPageControl alloc]initWithFrame:pageRc];

    m_pageControl.currentPage = 0;

    [m_pageControl addTarget:self action:@selector(onChangePage:) forControlEvents:UIControlEventValueChanged];

    [self addSubview:m_pageControl];

    

}

-(void)onChangePage:(id)nSender

{

    if(m_vcArray == nil) return;

    

    int nPage = (int)m_pageControl.currentPage;

    if(nPage < 0 || nPage >= m_vcArray.count) return;

    m_bClickedPage = TRUE;

    

    CGRect rc = m_scrollView.frame;

    CGPoint pos = m_scrollView.frame.origin;

    pos.x = rc.size.width * nPage;

    pos.y = 0;

    [m_scrollView setContentOffset:pos animated:TRUE];

}

-(void)addView:(UIView*)view

{

    if(view == nil) return;

    

    if(m_vcArray == nil)

    {

        m_vcArray = [[NSMutableArray alloc]init];

    }

    

    CGRect rc = m_scrollView.frame;

    rc.origin.x = rc.size.width * m_vcArray.count;

    rc.origin.y = 0;

    view.frame = rc;

    [m_scrollView addSubview:view];

    

    

    [m_vcArray addObject:view];

    

    int nw = rc.size.width;

    int nh = rc.size.height;

    m_scrollView.contentSize = CGSizeMake(nw * m_vcArray.count, nh);

    

    m_pageControl.numberOfPages = m_vcArray.count;

}

- (void)scrollViewDidScroll:(UIScrollView *)sender

{

    if(m_bClickedPage) return;

    

    CGFloat pageWidth = m_scrollView.frame.size.width;

    int page = floor((m_scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;

    m_pageControl.currentPage = page;

}

- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView

{

    m_bClickedPage = FALSE;

}