jacobjennings / htgradienteasing

HTGradientEasing ================

##Overview

Easily add smooth easing to CAGradientLayers. A combination of the exhaustive collection of easing functions provided by the AHEasing project and a color mixer, UIColor+CrossFade.

There's this optical illusion called the Mach Bands effect:

• http://perceptualstuff.org/machbandsbasic.html

The Mach Bands effect exaggerates our perception of the hard lines at the ends of linear gradients. Eased gradients tend to look better.

• https://github.com/warrenm/AHEasing
• https://github.com/cbpowell/UIColor-CrossFade

##Installation

Include the following line in your podfile:

pod 'HTGradientEasing'

If you do not use cocoapods, you must install dependencies AHEasing and UIColor+Crossfade.

Usage

A category on CAGradientLayer is provided with the interface:

- (void)setEasedGradientColors:(NSArray *)colors
                     locations:(NSArray *)locations
                easingFunction:(AHEasingFunction)easingFunction
     keyframesBetweenLocations:(NSUInteger)keyframesBetweenLocations;

Colors must be UIColors, and locations NSNumbers in [0,1]. A great variety of easing functions may be passed (quintic/sine/quadratic ease in/out/inout etc)

Example:

[gradientLayer setEasedGradientColors:@[[UIColor redColor], [UIColor blueColor]]
                            locations:@[@0, @1]
                       easingFunction:QuadraticEaseInOut
            keyframesBetweenLocations:6];

Demo project in action

Use it? Love/hate it?

Tweet the author @jakejennings, and check out HotelTonight's engineering blog: http://engineering.hoteltonight.com

Also, check out HotelTonight's other iOS open source:

• https://github.com/hoteltonight/HTAutocompleteTextField
• https://github.com/hoteltonight/HTGradientEasing
• https://github.com/hoteltonight/HTStateAwareRasterImageView
• https://github.com/hoteltonight/HTDelegateProxy