如何修改UIColor的色调，亮度和饱和度？

问题描述

让我说我有一个UIColor

  UIColor * color = [UIColor redColor]; 
  

现在我想修改饱和度/色调/亮度，我该怎么做？
我确实阅读了文档，但我仍然很困惑

我想修改我制作的UIColor（[UIColor redColor]）不会启动新颜色有一些偏好。如何修改它保留原件。我知道 colorWithHue：saturation：brightness：alpha：方法，我需要更新现有颜色的属性，保持红色。

解决方案

您可以在颜色上调用 getHue：saturation：brightness：alpha：，然后调整值，然后使用 + [UIColor colorWithHue：saturation：brightness：alpha：]

<$ p，使用调整后的组件创建新颜色$ p> CGFloat色调，饱和度，亮度，alpha;
BOOL ok = [< color> getHue：& hue saturation：& saturation brightness：& brightness alpha：& alpha];
如果（！ok）{
//处理错误
}
// ...调整组件..

UIColor * newColor = [UIColor colorWithHue：色调饱和度：饱和度亮度：亮度alpha：alpha];


Lets say I have a UIColor

UIColor *color = [UIColor redColor];

Now I want to modify the saturation/hue/brigthness, how do I do that?I did read the documentation but i'm still really confused

I want to modify the UIColor I made ([UIColor redColor]) not initiate a new color with some preferences. How do I modify it retaining the original. I do know about thecolorWithHue:saturation:brightness:alpha: method, I need to update an existing color's properties, keeping the red color.

解决方案

You can call getHue:saturation:brightness:alpha: on your color, then adjust the values, then create a new color with your adjusted components using +[UIColor colorWithHue:saturation:brightness:alpha:]

CGFloat hue, saturation, brightness, alpha ;
BOOL ok = [ <color> getHue:&hue saturation:&saturation brightness:&brightness alpha:&alpha ] ;
if ( !ok ) { 
    // handle error 
}
// ... adjust components..

UIColor * newColor = [ UIColor colorWithHue:hue saturation:saturation brightness:brightness alpha:alpha ] ;

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