Here is a code snippets for get RGB components of color. What can I do if the _countComponents is less than four, for example two? I tried to get components of color gray [UIColor grayColor]
int _countComponents = CGColorGetNumberOfComponents(colorRef);
if (_countComponents == 4) {
const CGFloat *_components = CGColorGetComponents(colorRef);
CGFloat red = _components[0];
CGFloat green = _components[1];
CGFloat blue = _components[2];
CGFloat alpha = _components[3];
The components of a color depend on the associated color space.
So _components[0]
, _components[1]
, etc are not necessary red, green blue and alpha.