Yak
iOS 6.0 + is better.
Sorry,i didn't device runing ios5 to test this project. if you have crash, can you send me, i will fix that try my best. thanks.
It's just one of my learning, and also thank you for suggestion.
sorry ,Bro. maybe you can see [ElectrocardiogramAnimation](https://github.com/saizhq/ElectrocardiogramAnimation). sometimes later, i will change it to swift style. thanks.