如何访问UIColor的颜色组件? [英] How to access the color components of an UIColor?

问题描述

即我想知道蓝色的价值.我如何从UIColor中得到它?

i.e. I want to know the value of blue. How would I get that from an UIColor?

推荐答案

UIColor类不提供有关颜色成分的信息.您必须改为从其CGColor获取组件.请注意，组件的数量取决于CGColorRef中使用的颜色空间.

UIColor class does not provide information about color components. You must get components from its CGColor instead. Note that the number of components depends on color space used in CGColorRef.

此代码显示蓝色的组件:

This code prints components for blue color:

UIColor* color = [UIColor blueColor];
int n = CGColorGetNumberOfComponents(color.CGColor);
const CGFloat *coms = CGColorGetComponents(color.CGColor);
for (int i = 0; i < n; ++i)
    NSLog(@"%f", coms[i]);

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