从UIColor中提取rgb [英] Extracting rgb from UIColor

问题描述

之前看过这个问题，但我的例子似乎没有用。

Seen this asked before but my example does not seem to work.

const CGFloat *toCol = CGColorGetComponents([[UIColor greenColor] CGColor]);

使用GDB查看数组是空的。任何提示？

The array is empty from looking at it with GDB. Any hints?

推荐答案

您提供的代码示例应该有效。

The code sample you provided should work.

试试这个：

UIColor uicolor = [[UIColor greenColor] retain];
CGColorRef color = [uicolor CGColor];

int numComponents = CGColorGetNumberOfComponents(color);

if (numComponents == 4)
{
  const CGFloat *components = CGColorGetComponents(color);
  CGFloat red = components[0];
  CGFloat green = components[1];
  CGFloat blue = components[2];
  CGFloat alpha = components[3];
}

[uicolor release];

这篇关于从UIColor中提取rgb的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！