TL; DR：
迅速：
extension UIColor {
var lighterColor: UIColor {
return lighterColor(removeSaturation: 0.5, resultAlpha: -1)
}
func lighterColor(removeSaturation val: CGFloat, resultAlpha alpha: CGFloat) -> UIColor {
var h: CGFloat = 0, s: CGFloat = 0
var b: CGFloat = 0, a: CGFloat = 0
guard getHue(&h, saturation: &s, brightness: &b, alpha: &a)
else {return self}
return UIColor(hue: h,
saturation: max(s - val, 0.0),
brightness: b,
alpha: alpha == -1 ? a : alpha)
}
}
用法：
let lightColor = somethingDark.lighterColor
目标C：
- (UIColor *)lighterColorRemoveSaturation:(CGFloat)removeS
resultAlpha:(CGFloat)alpha {
CGFloat h,s,b,a;
if ([self getHue:&h saturation:&s brightness:&b alpha:&a]) {
return [UIColor colorWithHue:h
saturation:MAX(s - removeS, 0.0)
brightness:b
alpha:alpha == -1? a:alpha];
}
return nil;
}
- (UIColor *)lighterColor {
return [self lighterColorRemoveSaturation:0.5
resultAlpha:-1];
}
@rchampourlier对@ user529758（已接受的答案）的评论是正确的-HSB（或HSV）和RGB解决方案给出的结果完全不同。RGB只是添加（或使颜色更接近）白色，而HSB解决方案使颜色更接近Brigtness比例尺的边缘-基本上从黑色开始，以纯色结束...
基本上，“亮度（值）”使颜色越来越接近黑色，而“饱和度”使颜色越来越接近白色...
如此处所示：
因此，使颜色实际上更亮（即更接近白色...）的解决方案将是使其饱和度值更小，从而得出以下解决方案：
- (UIColor *)lighterColor {
CGFloat h,s,b,a;
if ([self getHue:&h saturation:&s brightness:&b alpha:&a]) {
return [UIColor colorWithHue:h
saturation:MAX(s - 0.3, 0.0)
brightness:b /*MIN(b * 1.3, 1.0)*/
alpha:a];
}
return nil;
}
