JNWSpringAnimation : Spring physics in Core Animation
JNWSpringAnimation is a subclass of CAKeyframeAnimation that adds support for creating damped harmonic animations. It lets you implement spring animations to enhance the feel of your app. JNWSpringAnimation is a subclass of CAKeyframeAnimation, however, treated as if it were a subclass of CABasicAnimation. You can create the animation by using the dedicated initializer, +animationWithKeyPath or using +animation and by setting the key path afterwards.
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