学步园

UIScrollView的使用：

初始化时：

@property (retain, nonatomic) IBOutlet UIScrollView *_scrollview;

    [_scrollview setContentSize:CGSizeMake(320, 600)];   //height 足够大的时候才可以滑动
    [_scrollview setScrollEnabled:YES];                  //必须设置yes
    [_scrollview setPagingEnabled:YES];
    [_scrollview setShowsHorizontalScrollIndicator:YES];  //垂直滑动条

    [_scrollview setContentOffset:CGPointMake(0, 80) animated:YES]; //上滚80

    [_scrollview scrollRectToVisible:CGRectMake(0, 0, 320, 420) animated:YES];  //滚动到指定的位置