How do I get the value (float) for RG & B of a UIColor object?

Question

I have created a UIColor object and want to set the colors before drawing using CGContextSetRGBStrokeColor. In order to do that I need to extract the values of red, green and blue from the UIColor object. How do I do that?

Or is there perhaps a better way defining the color using some other kind of methods (couldn't find when I looked for it though) in which I can use the UIColor object to set the color?

Thanks in advance!

/Niklas

Answer 1

You don't need the RGB components in your case. Just use CGContextSetStrokeColorWithColor instead of CGContextSetRGBStrokeColor.

CGContextSetStrokeColorWithColor(context, thatUIColor.CGColor);

(To get the RGB components, see How to get RGB values from UIColor?.)

Answer 2

If you made a color on a desktop, just look up the RGB values in the color picker. Here: http://sketchup.google.com/support/bin/answer.py?hl=en&answer=96105

Otherwise, you could just use the "default" colors, if you don'T care much about the RGB values of a color.

Like this:

[UIColor redColor]

Look at the documentation for more info.