INTUAnimationEngineiOS 动画引擎

INTUAnimationEngine 是一个动画引擎，可以方便地定制很多动画效果。可以自定义动画、自定义动画时间、自定义动画完成的回调等等。

示例代码：

+ (INTUAnimationID)animateWithDuration:(NSTimeInterval)duration
                                 delay:(NSTimeInterval)delay
                                easing:(INTUEasingFunction)easingFunction
                            animations:(void (^)(CGFloat progress))animations
                            completion:(void (^)(BOOL finished))completion;