uitableview顶部bounes空间背景

source https://snipplr.com/view/50777/iphone-change-the-background-color-of-the-bounce-area-above-a-uitableview

UIView *topview = [[UIView alloc] initWithFrame:CGRectMake(0,-200,kScreenWidth,200)];
topview.backgroundColor = [UIColor colorWithRed:52/255.0 green:61/255.0 blue:77/255.0 alpha:1];
[self.tableView addSubview:topview];