ObjectC&&Swift 渐变色算法实现

概述-(NSArray *)getGradientColorWithStartColor:(UIColor *)startColor endColor:(UIColor *)endColor step:(NSInteger)step inverse:(BOOL)inverse { //1 get start color rgb CGFloat startR = 0.0, startG

-(NSArray *)getGradIEntcolorWithStartcolor:(UIcolor *)startcolor endcolor:(UIcolor *)endcolor step:(NSInteger)step inverse:(BOol)inverse {    //1 get start color rgb    CGfloat startR = 0.0,startG = 0.0,startB = 0.0;    CGcolorRef startcolorRGB = [startcolor CGcolor];    NSInteger startNumComponents = CGcolorGetNumberOfComponents(startcolorRGB);    if (startNumComponents == 4)    {        const CGfloat *components = CGcolorGetComponents(startcolorRGB);        startR = components[0];        startG = components[1];        startB = components[2];    }    //2 get end color rgb    CGfloat endR = 0.0,endG = 0.0,endB = 0.0;    CGcolorRef endcolorRGB = [endcolor CGcolor];    NSInteger endNumComponents = CGcolorGetNumberOfComponents(endcolorRGB);    if (endNumComponents == 4)    {        const CGfloat *components = CGcolorGetComponents(endcolorRGB);        endR = components[0];        endG = components[1];        endB = components[2];    }    //3 calculate total threshold by step    CGfloat stepR = 0.0,stepG = 0.0,stepB = 0.0;    stepR = step == 1 ? 0 : (endR-startR) / (step - 1);    stepG = step == 1 ? 0 : (endG-startG) / (step - 1);    stepB = step == 1 ? 0 : (endB-startB) / (step - 1);    //calculate uicolor by step    CGfloat green = startG;    CGfloat red   = startR;    CGfloat blue  = startB;    NSMutableArray *stepcolorArray = [[NSMutableArray alloc] initWithCapacity:step];    for (NSInteger i = 0; i < step - 1; i++) {        red   = red + stepR;        green = green + stepG;        blue  = green + stepB;        UIcolor *color = [UIcolor colorWithRed:red green:green blue:blue Alpha:0];        [stepcolorArray addobject:color];    }    return stepcolorArray;}

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