UIScrollView及相关协议方法

//初始化scrollview

UIScrollView *scroll =[[UIScrollView alloc]initWithFrame:CGRectMake(0,2 0, 320, 200)];

//用for循环,向scroll中添加图片

//用for循环去创建UIImageView 5
    for (int i=0; i<5; i++)
    {
        UIImageView *imageView =[[UIImageView alloc]initWithFrame:CGRectMake(i*320, 0, 320, 200)];
        //拼接图片名字
        NSString *nameStr =[NSString stringWithFormat:@"image%d.jpg",i+1];
        imageView.image =[UIImage imageNamed:nameStr];
        [scroll addSubview:imageView];
    }

//设置scrollView的滑动范围
    scroll.contentSize =CGSizeMake(320*5, 0);

//设置scrollView的分页
    scroll.pagingEnabled =YES;

//设置scrollView横竖向的显示条是否显示 Horizontal横
    scroll.showsHorizontalScrollIndicator =NO;
    //Vertical  竖
    scroll.showsVerticalScrollIndicator =YES;

//设置当前scrollView的偏移量
    //设置x.y向负方向的偏移量
    scroll.contentOffset =CGPointMake(0, 0);

//设置代理

scroll.delegate =self;
    [self.view addSubview:scroll];

//开始拖曳
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
{
    //Dragging  拖拽
    NSLog(@"开始拖拽");
}
//结束拖曳
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
{
    NSLog(@"结束拖拽");
}
//开始减速
- (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView
{
    NSLog(@"开始减速");
}
//结束减速
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
    NSLog(@"结束减速 完成");
}