scrollview tableView嵌套解决方案示例

//父视图滚动的回调，用于横向滚动判断
- (void)scrollViewDidScroll:(UIScrollView *)scrollView{    
    CGFloat placeholderOffset = 0;
    if (self.topView.selectedIndex == 0) {
        if (self.firstTableView.contentOffset.y > CGRectGetHeight(self.topView.frame) - kItemheight) {
            placeholderOffset = CGRectGetHeight(self.topView.frame) - kItemheight;
        }else {
            placeholderOffset = self.firstTableView.contentOffset.y;
        }
        [self.secondTableView setContentOffset:CGPointMake(0, placeholderOffset) animated:NO];
    }else {
        if (self.secondTableView.contentOffset.y > CGRectGetHeight(self.topView.frame) - kItemheight) {
            placeholderOffset = CGRectGetHeight(self.topView.frame) - kItemheight;
        }else {
            placeholderOffset = self.secondTableView.contentOffset.y;
        }
        [self.firstTableView setContentOffset:CGPointMake(0, placeholderOffset) animated:NO];
    }
}

//子视图滚动的回调，用于竖直方向上滚动判断
- (void)updateTopViewFrame:(UIScrollView *)scrollView{
    CGFloat placeHolderHeight = CGRectGetHeight(self.topView.frame) - self.topView.itemHeight;
    CGFloat offsetY = scrollView.contentOffset.y;
    CGFloat y = 0.0;
    if (offsetY >= 0 && (offsetY <= placeHolderHeight)) {
        y = -offsetY;
    } else if (offsetY > placeHolderHeight) {
        y = -placeHolderHeight;
    } else if (offsetY < 0) {
        y = -offsetY;
    }
    [self.topView mas_updateConstraints:^(MASConstraintMaker *make) {
        make.top.offset(y + kNavBarHeight);
    }];
}