Created by: Zhukn1
I've added support for underlining the textfield.
There is a new bool value hasUnderline which defaults to NO. If you turn it on the - a straight line at the bottom of the TextField will appear.
You can customize the underlineColor and underlineHight of the line.
The default values are underlineColor = 0.5f and underlineHight = [UIColor lightGrayColor] which draws a perfect 1px line on retina displays.
Also added the corresponding tests.
I've used your component in my project and just wanted to share the enhancement I had to make for the given design. Major thanks for building this - it really is a beauty!:)