Demo code of building color palette system in SwiftUI

SwiftUI_structColor.swift

struct BaseColor {
    /// dynamic color sets (with dark and light mode)
    let contrastPrimary = Color("contrastPrimary")
    let themePrimary = Color("themePrimary")
    
    /// staic color sets (not updating along with color mode)
    let darkPrimary = Color("darkPrimary")
    let lightPrimary = Color("lightPrimary")
}

struct TokenColor {
    let baseColor = BaseColor()
    
    let textDefault: Color!
    let textTheme: Color!
    let textLight: Color!
    
    let buttonTheme: Color!
    let buttonContrast: Color!
    
    let backgroundDefault: Color!
    let backgroundTheme: Color!
    
    init() {
        /// themePrimary
        self.textTheme = baseColor.themePrimary
        self.buttonTheme = baseColor.themePrimary
        self.backgroundTheme = baseColor.themePrimary
        
        /// contrastPrimary
        self.buttonContrast = baseColor.contrastPrimary
        self.textDefault = baseColor.contrastPrimary
        self.backgroundDefault = baseColor.contrastPrimary
        
        /// lightPrimary
        self.textLight = baseColor.lightPrimary
    }
}