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UIColor+CrossFade.h
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UIColor+CrossFade.h
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/**
* Copyright (c) 2012-2013 Charles Powell
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
//
// UIColor+CrossFade.h
//
#import <UIKit/UIKit.h>
#import <QuartzCore/QuartzCore.h>
@interface UIColor (CrossFade)
/**
* Fades between firstColor and secondColor at the specified ratio:
*
* @ ratio 0.0 - fully firstColor
* @ ratio 0.5 - halfway between firstColor and secondColor
* @ ratio 1.0 - fully secondColor
*
*/
+ (UIColor *)colorForFadeBetweenFirstColor:(UIColor *)firstColor
secondColor:(UIColor *)secondColor
atRatio:(CGFloat)ratio;
/**
* Same as above, but allows turning off the color space comparison
* for a performance boost.
*/
+ (UIColor *)colorForFadeBetweenFirstColor:(UIColor *)firstColor secondColor:(UIColor *)secondColor atRatio:(CGFloat)ratio compareColorSpaces:(BOOL)compare;
/**
* An array of [steps] colors starting with firstColor, continuing with linear interpolations
* between firstColor and lastColor and ending with lastColor.
*/
+ (NSArray *)colorsForFadeBetweenFirstColor:(UIColor *)firstColor
lastColor:(UIColor *)lastColor
inSteps:(NSUInteger)steps;
/**
* An array of [steps] colors starting with firstColor, continuing with interpolations, as specified
* by the equation block, between firstColor and lastColor and ending with lastColor. The equation block
* must take a float as an input, and return a float as an output. Output will be santizied to be between
* a ratio of 0.0 and 1.0. Passing nil for the equation results in a linear relationship.
*/
+ (NSArray *)colorsForFadeBetweenFirstColor:(UIColor *)firstColor
lastColor:(UIColor *)lastColor
withRatioEquation:(float (^)(float input))equation
inSteps:(NSUInteger)steps;
/**
* Convert UIColor to RGBA colorspace. Used for cross-colorspace interpolation.
*/
+ (UIColor *)colorConvertedToRGBA:(UIColor *)colorToConvert;
/**
* Creates a CAKeyframeAnimation for the given key path, duration, and first/last colors that can be
* applied to an appropriate CALayer property (i.e. backgroundColor). See the demo for example usage.
*/
+ (CAKeyframeAnimation *)keyframeAnimationForKeyPath:(NSString *)keyPath
duration:(NSTimeInterval)duration
betweenFirstColor:(UIColor *)firstColor
lastColor:(UIColor *)lastColor;
/**
* Same as above, but allows setting a ratio equation (for non-linear transitions between colors) and
* the number of steps to calculate. Decreasing steps may improve performance as it decreases the number
* of cross-fade calculations necessary.
*/
+ (CAKeyframeAnimation *)keyframeAnimationForKeyPath:(NSString *)keyPath
duration:(NSTimeInterval)duration
betweenFirstColor:(UIColor *)firstColor
lastColor:(UIColor *)lastColor
withRatioEquation:(float (^)(float))equation
inSteps:(NSUInteger)steps;
@end