Previously I mentioned PRTween, a library that provides a number of easing functions that you can use with UIView’s.
Here’s another great library from Zoreslav Khimich for UIView animation that allows you to apply easing to any animatable UIView properties called UIView-EasingFunctions.
UIView-EasingFunctions provides a UIView category, and with your own easing functions, or that from an already existing library allows you to apply the functions using a blocks based syntax.
You can find UIView-Easing functions on Github here.
An Objective-C library with an extensive collection of easing functions called AHEasing that you can plug right into UIView-Easing can be found on Github here.
A great UIView animation library.
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