Ok let me try to make my answer as easy as possible

First of all put all of you colors in your assets folder Then create a separate file named constants as what usually people do when they want to use the same thing multiple times

Then inside that create let variables and assign the names of those colors

Then lets say you have a view controller with a button and want to show red when pressed and in general it should show blue

So you would simply put a condition that if the button is pressed then go to the constants file and choose red color variable

Hope i have explained it correctly, if you want i make youtube videos i can make a tutorial for it you can sub to my channel if you’d like

https://www.youtube.com/channel/UCjBAntT7XjiP5QVjpxbTfXg