时间轴效果的实现

构思一下
1个正方形方块＋1个圆环

开始
假设cell的背景色为#define CELLBGCOLOR [UIColor colorwith......]

//1.实现方块,定义方块的长=15 高＝15 构造一个透明假象

UIView *sqView = [[UIView alloc] initWithFrame:CGRectMake(CELL_HEIGHT_FOOT_LEFTX/2 - 15/2, Height_Section_Header/2 - 15/2, 15, 15)];
sqView.backgroundColor = CELLBGCOLOR;//这里就是为了让其和cell的背景一致啦

[headerLabel addSubview:sqView];

//2.添加你的圆环,如何剧中，自己处理下把

        CGFloat circularLabelWidth = 10;
        UILabel *circularLabel = [[UILabel alloc] initWithFrame:CGRectMake(2.5, 2.5, circularLabelWidth, circularLabelWidth)];
        circularLabel.backgroundColor = self.footPrintTableView.backgroundColor;
        circularLabel.layer.cornerRadius = circularLabelWidth/2;
        circularLabel.layer.masksToBounds = YES;
        circularLabel.layer.borderColor = [UIColor whiteColor].CGColor;
        circularLabel.layer.borderWidth = circularLabelWidth/4;

[sqView addSubview:circularLabel];