Rewrite Dhawaldawar's TextFieldValidator library to Swift language

A lightweight, customizable subclass of UITextField that supports multiple regex validations and provides a simple UI to provide validation feedback.

Dhawaldawar has written a great libray, which is named TextFieldValidator at https://github.com/dhawaldawar/TextFieldValidator

He doesn't seem to update his repository from a year ago. So this library is still a objective-C library. We can also use this by using bridged-header file, but it's more better if we use this library in Swift language.

See his description at his blog, and from thinkotech with more example and how to use.

How to use (basic):

• Download and import the T4TextFieldValidator.swift file to anywhere in your project
• Add the icon_error to your Assets.xcassets
• Use custom class T4TextFieldValidator instead the default UITextField
• Assign a view to presentInView data member of T4TextFieldValidator class on which you want to show error popup. If you are managing text field from storyboard/xib then you can directly assign outlet of “presentInView” to any view.
• Assign delegate of the text field
• Add regex to validate
• Call validate method when you need to validate the text field

For more information and detail, visit this post. Or, you can see my demo, with some textfield type such as email, phone number, password...

Thank you, Dhawaldawar