- (YBookmarkView *)bookmarkView
{
    if (!_bookmarkView) {
        _bookmarkView = [[YBookmarkView alloc] initWithFrame:self.view.frame];
        _bookmarkView.dataSource = self;
        _bookmarkView.delegate = self;
        [_bookmarkView configMake:^(YBBookMarkConfig *config) {
            config.topViewHeight = 50;
            config.titleSelectFont = [UIFont systemFontOfSize:17];
//          	config.fixedTitleWidth = 100; //如果标题是固定宽度设置
//					还有很多参数可以设置，自己体会吧 😊
        }];
    }
    return _bookmarkView;
}

/**
 bookMarkView 数据来源

 @param bookMarkView bookMarkView
 @return 控制器数量
 */
- (NSInteger)numberOfItemInBookMarkView:(YBookmarkView *)bookMarkView;

/**
 top title 标签

 @param bookMarkView bookMarkView
 @param index 第几个标签
 @return title
 */
- (NSString *)bookMarkView:(YBookmarkView *)bookMarkView titleAtIndex:(NSInteger)index;

/**
 控制器  数据来源
 说明：每个控制器不会重复调用
 @param bookMarkView bookMarkView
 @param index 第几个标签
 @param viewRect 控制器的CGRect 大小
 @return 控制器
 */
- (UIViewController *)bookMarkView:(YBookmarkView *)bookMarkView viewAtIndex:(NSInteger)index viewRect:(CGRect)viewRect;

[self.bookmarkView reloadData];

//** 点击 title 回调 */
- (void)bookMarkView:(YBookmarkView *)bookMarkView didSelectTitleAtIndex:(NSInteger)index;
//** 滚动到第几个标签回调 */
- (void)bookMarkView:(YBookmarkView *)bookMarkView didScrollToIndex:(NSInteger)index;
//** bottomMark 滑动结束 回调*/
- (void)bookMarkView:(YBookmarkView *)bookMarkView didEndDecelerating:(NSInteger)index;
- (void)bookMarkView:(YBookmarkView *)bookMarkView updateLayoutIndex:(NSInteger)index viewController:(UIViewController *)vc;
//** bottomMark 将要显示 回调*/
- (void)bookMarkView:(YBookmarkView *)bookMarkView bottomMarkWillDisplayCell:(UICollectionViewCell *)cell atIndex:(NSInteger)index;
//** 第index个子控制器 将要显示 回调*/
- (void)bookMarkView:(YBookmarkView *)bookMarkView willDisplayingVC:(__kindof UIViewController *)vc index:(NSInteger)index;
//** 第index个子控制 结束显示 回调*/
- (void)bookMarkView:(YBookmarkView *)bookMarkView didEndDisplayingVC:(__kindof UIViewController *)vc index:(NSInteger)index;