Color difference between drawRect and Interface Builder?

Question

Simply, I have 2 views in interface builder, one is set to the color 99,99,99 using the RGB sliders in interface builder.

The other view is colored programmatically to achieve a certain shape. I fill it using:

//Obviously, this is in drawRect.
[[UIColor leadColor] set];
CGContextEOFillPath(myContext);

//And this is a category on UIColor
+ (UIColor *)leadColor {
    return [UIColor colorWithWhite:99/255.0 alpha:1.0];
}

The result:

Why does this difference exist??

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EDIT: (unecessary drawRect Code removed)

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EDIT2:

So, here I am lying to myself .. "Interface builder showed RGB 99,99,99 as 80,80,80. I bet it offsets the number by 19." >.> ... A desperate man using Xcode thinks crazy stuff like this .. The result:

PERFECT!!, but why???? Another Xcode bug? I found like 10 of those in the past month ...

Tormentil

Post a complete drawRect as that two lines together with UIGraphicsGetCurrentContext are not drawing the color over the view. – Overeat

Thanks for testing it out. Just replace CGContextEOFillPath(myContext); with CGContextFillRect. Simpler, just to test. – Tormentil

Have you tried [UIColor colorWithRed:99/255.0 green:99/255.0 blue:99/255.0 alpha:1.0]? – Eligible

@Tormentil doesn't work anyway with CGContextFillRect(myContext, self.frame);. Please post the code you are using. – Overeat

NOTE: I've got some very interesting information. Let me post them before you guys try something else. – Tormentil

Answer 1

I finally reached the fine-tuning stage of this app, and had to solve this issue, so, I searched and easily found the solution:

How do I enter RGB values into Interface Builder?

Illustration:

Tormentil

Thanks for that. I wouldn't have thought to do that in IB – Ballocks

I had the same problem and wven tested colors with Fireworks jejej – Legendre

Answer 2

colorWithWhite uses grayscale space, and a color of 99 in grayscale space doesn't map to a color of (99,99,99) in RGB space.

So in order to get the same result as in Interface Builder, you need to use RGB space. Replace your call to colorWithWhite with this:

[UIColor colorWithRed:99/255.0 green:99/255.0 blue:99/255.0 alpha:1.0]

Eligible

What you are saying makes perfect sense, however, it is not the case. The screenshot I uploaded has two different gray colors, the one drawn by drawRect + leadColor = RGB 99,99,99. (i.e. colorWithWhite is the same as the code you provided. Still, I tested it, no use). However, the color set in IB is showing up as RGB 80,80,80. – Tormentil

Weird! If you open your .xib in a text editor and look around for the color value, what do you see? – Eligible

<object class="NSColor" key="IBUIBackgroundColor"> <int key="NSColorSpace">2</int> <bytes key="NSRGB">MC40NjI3NDUwOTggMC40NjI3NDUwOTggMC40NjI3NDUwOTgAA</bytes> </object> .. Makes no sense to me. – Tormentil

Althoug you are right with the white space issue this is a problem of color space. – Legendre