SSBouncyButton is simple button UI component with iOS 7-style bouncy animation.
Take A Look
pod 'SSBouncyButton', '~> 1.0'
Use it just like using an UIButton. You can find the sample code.
Author and License
SSBouncyButton is written by Suyeol Jeon and, Suyeol Jeon and StyleShare maintain it. It is distributed under MIT License. The source code is available on GitHub.