最近比較流行的布局就是頁(yè)面有個(gè)tab頁(yè)下面是一個(gè)或者幾個(gè)tableView可以左右滑動(dòng)吁伺，tab頁(yè)滑到頂部置頂懸浮逞带。
思路：一個(gè)scrollView鑲嵌一個(gè)scrollView中利用代理監(jiān)聽(tīng)他們的偏移量欺矫，設(shè)置一個(gè)臨界值，沒(méi)過(guò)這個(gè)值主scrollView可以滑動(dòng)展氓，子scrollView不可以滑動(dòng)穆趴，當(dāng)超過(guò)這個(gè)值，主scollView不可以滑動(dòng)遇汞，子scollView可以滑動(dòng)未妹。
首先創(chuàng)建兩個(gè)scrollView簿废，MainScrollView和ContentScrollView都繼承于UIScrollView。
MainScrollView.m文件：

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    return YES;
}

支持多手勢(shì)
ContentScollView里面可以添加一個(gè)或者多個(gè)UITableView
1络它、在控制器中設(shè)置topViewHeight（topView的高度）和floatHeight（懸浮的高度）族檬，設(shè)置主子scrollView是否可以滑動(dòng)

self.topViewHeight = 300;
self.floatHeight = 200;
self.canMove = YES;
self.contentCanMove = NO;

2、懶加載MainScrollView和ContentScollView

- (MainScrollView *)mainScrollView
{
    if (!_mainScrollView)
    {
        CGFloat height = kScreenHeight - 44 - [UIDevice statusBarHeight] - [UIDevice tabBarHeight];
        _mainScrollView = [[MainScrollView alloc] initWithFrame:CGRectMake(0, 0, kScreenWidth, height)];
        _mainScrollView.delegate = self;
        _mainScrollView.contentSize = CGSizeMake(0,  height + self.topViewHeight);
        if (@available(iOS 11.0, *))
        {
            _mainScrollView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
        }
    }
    return _mainScrollView;
}

- (ContentScrollView *)contentScrollView
{
    if (!_contentScrollView)
    {
        CGFloat height = kScreenHeight - 44 - [UIDevice statusBarHeight] - [UIDevice tabBarHeight];
        _contentScrollView = [[ContentScrollView alloc] initWithFrame: CGRectMake(0, self.topViewHeight, kScreenWidth, height - self.floatHeight)];
        _contentScrollView.tableView.delegate = self;
        _contentScrollView.tableView.dataSource = self;
    }
    return _contentScrollView;
}

3化戳、設(shè)置代理

#pragma mark - UIScrollViewDelegate
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    if (scrollView == self.mainScrollView)
    {
        CGFloat contentOffsetY = scrollView.contentOffset.y;
        CGFloat maxOffsetY = self.topViewHeight - self.floatHeight;
        if (contentOffsetY >= maxOffsetY)
        {
            self.contentCanMove = YES;
            self.canMove = NO;   // 自己不能滑動(dòng)了
        }
        if (!self.canMove)
        {
            [scrollView setContentOffset:CGPointMake(0, maxOffsetY)];
        }
    }
    else if ([scrollView isKindOfClass:UITableView.class])
    {
        CGFloat offsetY = scrollView.contentOffset.y;
        if (offsetY <= 0)
        {
            self.canMove = YES;
            self.contentCanMove = NO;
        }
        if (!self.contentCanMove)
        {
            [scrollView setContentOffset:CGPointMake(0, 0)];
        }
    }
}