How do I comfortably use CGColor in an NSArray with CGGradient

Question

I have two UIColor instances and want to use them creating a gradient. The code works, but it gives me a warning when I call the arrayWithObject: constructor:

Answer 1

Try this

UIColor *startColor, *endColor; 
   // ...
   NSArray *colors = [NSArray arrayWithObjects:
                      (id)startColor.CGColor, (id)endColor.CGColor, nil];
   CGGradientRef gradient = CGGradientCreateWithColors(colorSpace, 
                     (CFArrayRef) colors, NULL);