iOS:UI系列之UIScrollview和UIPagecontrol

UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:self.view.bounds];
    scrollView.backgroundColor = [UIColor redColor];
    //设置内容页的大小,内容的大小必须比frame大,才能够滚动
    //如果不设置内容页的大小,默认和frame大小一致
    [scrollView setContentSize:CGSizeMake(320, 568 * 3)];
    
    //设置滚动条是否可见
    //水平滚动条
    scrollView.showsHorizontalScrollIndicator = YES;
    //竖直滚动条
    scrollView.showsVerticalScrollIndicator = YES;
    //设置内容页的偏移量, 默认内容页从(0, 0)点开始
    scrollView.contentOffset = CGPointMake(0, 0);
    //设置整页滑动
    scrollView.pagingEnabled = NO;
    //设置边界是否回弹
    scrollView.bounces = YES;
    //滚动到顶部
    scrollView.scrollsToTop = YES;
    //设置能否滚动
    scrollView.scrollEnabled = YES;
    //设置边界是否回弹,只有在content的宽度或者高度 小于 frame的宽度或者高度,才有效
    scrollView.alwaysBounceVertical = YES;
    scrollView.alwaysBounceHorizontal = YES;
    
    //缩放, 缩放必须结合着代理(delegate)才能生效, 指定scrollView上哪个视图进行缩放
    //设置当前的缩放比例, 默认为1.0
    scrollView.zoomScale = 1.0;
    //设置最大缩放比例
    scrollView.maximumZoomScale = 2.0;
    //设置最小缩放比例
    scrollView.minimumZoomScale = 0.5;
    
    //设置delegate
    scrollView.delegate = self;
    
    [self.view addSubview:scrollView];
    [scrollView release];
    
    imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"image"]];
    imageView.frame = CGRectMake(0, 0, 320, 568 * 3);
    [scrollView addSubview:imageView];
    [imageView release];

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

//当滚动scrollView时调用
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    NSLog(@"%s", __FUNCTION__);
}

//当发生了缩放的时候调用
- (void)scrollViewDidZoom:(UIScrollView *)scrollView
{
    NSLog(@"%s", __FUNCTION__);
}

//对ScrollView中的哪个视图缩放
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
    return imageView;
}
//将要开始拖拽的时候调用
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
{
    NSLog(@"%s", __FUNCTION__);
}

//将要结束拖拽的时候调用
- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset
{
    NSLog(@"%s", __FUNCTION__);
}

//已经结束拖拽的时候调用
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
{
    NSLog(@"%s", __FUNCTION__);
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    //UIPageControl:页码控制器, 继承于UIControl
    UIPageControl *pageControl = [[UIPageControl alloc] init];
    pageControl.frame = CGRectMake(0, 100, 320, 30);
    pageControl.backgroundColor = [UIColor blackColor];
    pageControl.numberOfPages = 10;
    //设置未选中的颜色
    pageControl.pageIndicatorTintColor = [UIColor yellowColor];
    //设置已选中的颜色
    pageControl.currentPageIndicatorTintColor = [UIColor blueColor];
    //设置只有一页时隐藏
    pageControl.hidesForSinglePage = NO;
    //关联方法
    [pageControl addTarget:self action:@selector(changePage:) forControlEvents:UIControlEventValueChanged];
    [self.view addSubview:pageControl];
    [pageControl release];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (void)changePage:(UIPageControl *)pageControl
{
    //页码是从零开始的
    NSLog(@"%d", pageControl.currentPage + 1);
}

- (void)changePage:(UIPageControl *)pageControl
{
    if (pageControl.currentPage == 0) {
        [scrollView1 setContentOffset:CGPointMake(0, 0) animated:YES];
    } else if (pageControl.currentPage == 1) {
        [scrollView1 setContentOffset:CGPointMake(320, 0) animated:YES];
    } else if (pageControl.currentPage == 2) {
        [scrollView1 setContentOffset:CGPointMake(320 * 2, 0) animated:YES];
    }
}

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
    pageControl1.currentPage = scrollView.contentOffset.x / 320;
}

- (void)close:(UIButton *)button1
{
    //如果子视图的父视图被移除,那么这个子视图也会被移除
    [button removeFromSuperview];
    [scrollView1 removeFromSuperview];
    [pageControl1 removeFromSuperview];
}