如何添加阈值分割线以及不同的阈值背景？How to add dividing lines and different background colors for different divided range?

你好， 我在您的OC版本中看到有带有阈值分割线的sample。 但是在swift版本中并没有找到，请问swift中可以实现这个功能嘛？ 另外我想给不同阈值范围添加不同的背景颜色，这个可以通过您的库实现嘛？ 谢谢！
Hi, I found there is a line chart with dividing line with your previous OC version. Can it be implemented with your swift version as well? In addition, is it possible for me to add different colors for different threshold (divided) range? Thank you so much for your help.