This could be the silliest question, but I am trying to use the MengTo/Spring iOS Animation in Swift (link to Github [Spring](https://github.com/MengTo/Spring) ). But for some reason not able to get it working. I am getting error: use of undeclared type 'SpringView'

I followed the steps below:

1. Dragged the "Spring" folder inside my project in Xcode.
2. Created a UIView and connected it to SpringView class
3. Set the attributes mentioned
4. Created an outlet named "layer" in the view controller

As soon as I create the outlet, I get an error 'Use of undeclared type 'SpringView''

I am not sure what else is there in this. Can anyone help?
Thank you.
Regards.