I'm not sure what these codes are called, I think hex codes. The code for it is 006633 and it's a dark green color. I want it to match my view backgrounds.
For your problem:
your Hex code #006633 stands for
Red 00 Green 66 Blue 33
Since they are in Hex, converting to int.
R 0 ; G 102; B 51
the iOS api set it as
[self.view setBackgroundColor:[UIColor colorWithRed:0 green:102/255.0 blue:51/255.0 alpha:1.0]];
Refere to the below links if you want to understand further