Simulates a color at opacity < 1.0 when placed over a black or white background

SimulateColorOpacity.swift

func hueAccentColor(angle: CGFloat) -> Color {
	return Color(hue: CGFloat(angle / 360.0), saturation: 1.0, brightness: 1.0, opacity: 1.0)
}

func whiteColor() -> Color {
	return Color.init(uiColor: .white) //        return Color(hue: CGFloat(hueAngle / 360.0), saturation: 0.0, brightness: 1.0, opacity: 1.0)
}

func blackColor() -> Color {
	return Color.init(uiColor: .black) //        return Color(hue: CGFloat(hueAngle / 360.0), saturation: 0.0, brightness: 0.0, opacity: 1.0)
}

enum UserInterfaceStyleMode: Int {
	case dark = 0
	case light = 1
}

enum UserInterfaceStyleSource {
	case system
	case user(UserInterfaceStyleMode)
}

func styleMode(source: UserInterfaceStyleSource) -> UserInterfaceStyleMode {
	var mode: Int {
		switch source {
		case .system:
			return UITraitCollection.current.userInterfaceStyle.rawValue
		case .user(let mode):
			return mode.rawValue
		}
	}
	return UserInterfaceStyleMode(rawValue: mode) ?? .light
}

var userInterfaceStyleSource: UserInterfaceStyleSource.Type = UserInterfaceStyleSource.self
var userInterfaceStyleMode: UserInterfaceStyleMode.Type = UserInterfaceStyleMode.self

func opaqueHueColor(angle: CGFloat, opacity: CGFloat?, userInterfaceStyleSource: UserInterfaceStyleSource) -> some View {
	return ((styleMode(source: userInterfaceStyleSource) != UserInterfaceStyleMode.light)
		? whiteColor().opacity(opacity ?? 0.5) : blackColor().opacity(opacity ?? 0.5))
		.background {
			hueAccentColor(angle: angle)
		}
		.overlay {
			((styleMode(source: userInterfaceStyleSource) == UserInterfaceStyleMode.light) ? whiteColor().opacity(opacity ?? 0.5) : blackColor().opacity(opacity ?? 0.5))
		}
}

/* Usage

 colorManager.opaqueHueColor(angle: 216.0, opacity: 0.5, userInterfaceStyleSource: ColorManager.UserInterfaceStyleSource.system)
 colorManager.opaqueHueColor(angle: 216.0, opacity: 0.5, userInterfaceStyleSource: ColorManager.UserInterfaceStyleSource.user(ColorManager.UserInterfaceStyleMode.dark))
 colorManager.opaqueHueColor(angle: 216.0, opacity: 0.5, userInterfaceStyleSource: ColorManager.UserInterfaceStyleSource.user(ColorManager.UserInterfaceStyleMode.light))

  */