CalmParametricAnimations

A nice iOS extension that gives CAKeyframeAnimation support for all of the complex easing curves found at http://easings.net

Installation

Add pod 'CalmParametricAnimations' to your Podfile or download the source here

Curves

CalmParametricAnimations supports the following curves (type ParametricTimeBlock):

typedef double (^ParametricTimeBlock)(double time)

sineIn
sineOut
sineInOut
squashedSineInOut

linear

appleIn
appleOut
appleInOut

backIn
backOut
backInOut
easeInBackOut
easeOutDramatic

quadraticIn
quadraticOut

cubicIn
cubicOut
cubicInOut

circularIn
circularOut

expoIn
expoOut
expoInOut

elasticIn
elasticOut

variableElasticOut (intensity) -> ParametricTimeBlock
bezierEvaluator (time, point1, point2) -> ParametricTimeBlock
arc (radius, center) -> ParametricTimeBlock

These can the be evaluated directly as functions passing double time from 0 - 1, or by using one of the "value blocks" we’ve defined:

double
point
size
rect
color
transform3D

Each of these value blocks has a corresponding extension method on CAKeyframeAnimation that allows passing of the key-path, the time function. For example:

+ (instancetype)animationWithKeyPath:(NSString *)path
                             timeFxn:(ParametricTimeBlock)timeFxn
                            fromRect:(CGRect)fromValue
                              toRect:(CGRect)toValue;

which will producte an animation that interpolates between the two rects according to the easing curve, with the duration set after initialization.