iOS - tabeleview 设置sectionHeader

• 如何把sectionHeader悬浮在我们想要的位置

    CGFloat height = 0; //height是正的就是向下偏移 正负代表了方向
    CGFloat sectionHeaderHeight = 45; //sectionHeader的高度
    if (scrollView.contentOffset.y <= sectionHeaderHeight && scrollView.contentOffset.y >= 0) {
        scrollView.contentInset = UIEdgeInsetsMake(0, 0, 0, 0);
    } else if (scrollView.contentOffset.y >= sectionHeaderHeight) {
        //这里可以设置sectionHeader悬浮的位置
        scrollView.contentInset = UIEdgeInsetsMake(sectionHeaderHeight + height, 0, 0, 0);
    }