這里我用的是MJRefresh，給MJ的下拉刷新加背景顏色的話只能加相當于一個cell的距離，然而我們實際需求是下滑的那些顏色也是要和下拉刷新的背景顏色相同，所以這里我只能自己加一個遮罩View

    self.refreshBgV = [[UIView alloc] initWithFrame:CGRectMake(0, -kScreenH, kScreenW, kScreenH)];
    self.refreshBgV.backgroundColor = RGBColor(0xe5e5e5);
    [self.view addSubview:self.refreshBgV];

#pragma mark UIScrollView
- (void)scrollViewDidScroll:(UIScrollView *)scrollView{
    CGRect frame = self.refreshBgV.frame;
    frame.origin.y = frame.origin.y - (scrollView.contentOffset.y - last);
    self.refreshBgV.frame = frame;
    last = scrollView.contentOffset.y;
    [self.view setNeedsLayout];
}

這樣可實現(xiàn)效果