Get Slightly Lighter and Darker Color from UIColor

Question

I was looking to be able to turn any UIColor into a gradient. The way I am intending to do this is by using Core Graphics to draw a gradient. What I am trying to do is to ge

Answer 1

I'm not sure if you're looking for some sort of Objective-C answer, but based on how colors specified by RGBA work, I think you can simply scale the RGB values according to an arbitrary factor to get a "lighter" or "darker" shade. For example, you might have a blue:

[UIColor colorWithRed:0.0 green:0.0 blue:1.0 alpha:1.0];

Want a darker blue? Multiply the RGB values by 0.9:

[UIColor colorWithRed:0.0 green:0.0 blue:0.9 alpha:1.0];

Voila. Or maybe you have an orange:

[UIColor colorWithRed:1.0 green:0.4 blue:0.0 alpha:1.0];

Choose another scale factor, say, 0.8:

[UIColor colorWithRed:0.8 green:0.32 blue:0.0 alpha:1.0];

Is that the sort of effect you're looking for?