iOS scrollerView 嵌套tableview 上下滑动

    self.bgScrollView.bounces = NO;
///和后边bottomCellOffset 正好相反
    CGFloat maxH = (Screen_Height - self.bgScrollView.tableViewBottomFloat - Screen_NAV_Height ) * 0.7 - 20;
    CGFloat tempTableViewOffsetY = maxH;
    ///重新设置tv高度
    [self.bgScrollView.tableView mas_updateConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(self.bgScrollView.headerButton.mas_bottom);
        make.height.mas_equalTo(tempTableViewOffsetY);
        make.left.bottom.right.equalTo(self.carInfoView);
    }];

/// table能不能滚动
@property (nonatomic, assign) BOOL canScroll; 
/// scroll能不能滚动
@property(assign, nonatomic) BOOL superCanScroll; 

自定义view 的init 方法 或者vc的viewDidLoad 方法

        self.canScroll = NO;
        self.superCanScroll = YES;

/// 子视图滚动时候，同时响应滚动手势。
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
    return YES;
}

- (void)scrollViewDidScroll:(UIScrollView *)scrollView{

    //tableView 滚动处理
    if (scrollView == self.tableView){
        NSLog(@"tabelview >>>>>>> 滚动 == %.2F",scrollView.contentOffset.y);

        if (!self.canScroll) {
            scrollView.contentOffset = CGPointZero;
        }
        if (scrollView.contentOffset.y < 0 ) {
            scrollView.contentOffset = CGPointZero;
            self.superCanScroll = YES;
            self.canScroll = NO;
        }
    }else{
        /*
         当 底层滚动式图滚动到指定位置时，
         停止滚动，开始滚动子视图
         20 :self.bgScrollView.headerButton 的高度
         10：底部bottom 高度
         */
//        CGFloat bottomCellOffset = (Screen_Height - self.tableViewBottomFloat - Screen_NAV_Height - 20) * 0.3;
//        CGFloat bottomCellOffset = (Screen_Height - self.tableViewBottomFloat - Screen_NAV_Height ) * 0.3 + 20;
        CGFloat bottomCellOffset = (Screen_Height - self.tableViewBottomFloat - Screen_NAV_Height ) * 0.3 + 10; ///这个是外边tableview的高度
        if (scrollView.contentOffset.y >= bottomCellOffset) {
            scrollView.contentOffset = CGPointMake(0, bottomCellOffset);
            if (self.superCanScroll) {
                self.superCanScroll = NO;
                self.canScroll = YES;
            }
        }else{
            if (!self.superCanScroll) {//子视图没到顶部
                scrollView.contentOffset = CGPointMake(0, bottomCellOffset);
            }
        }
    }
}