colors property
read / write
        Creating a map that maps the integer values of the cross to the colors that they should be displayed as.
Implementation
Map<int, CupertinoDynamicColor> colors = <int, CupertinoDynamicColor>{
  0: CupertinoColors.systemGrey,
  1: CupertinoColors.systemGreen,
  2: CupertinoColors.systemRed,
  3: CupertinoColors.systemBlue,
  4: CupertinoColors.systemYellow,
};