In my app I have a color.xcasset with following structure: color.xcasset
->Red
->primarycolor
->secondarycolor
->backgroundcolor
->headercolor
->Blue
->primarycolor
->secondarycolor
->backgroundcolor
->headercolor
->Yellow
->primarycolor
->secondarycolor
->backgroundcolor
->headercolor
Now I want to load only one folder at a time and that i will specify/select somewhere in app or in code. For example: When I choose to apply red theme to my app, it should load red folder. Same for blue and yellow themes. How I can do this?