anchor.diff:    color: Color(0xFF3C3C44),
     darkColor: Color(0xFFEBEBF5),
   );
  -
  -/// Define the iOS version style of [CupertinoActivityIndicator].
  -enum CupertinoActivityIndicatorIOSVersionStyle {
  -  /// The style that is used in iOS13 and earlier (12 points).
  -  @Deprecated(
  -    'Use iOS14 instead. '
  -    'This feature was deprecated after v1.21.0-1.0.pre.'
  -  )
  -  iOS13,
  -
  -  /// The style that was introduced in iOS14 (8 points).
  -  iOS14,
  -}
   
   /// An iOS-style activity indicator that spins clockwise.
   ///
  
positive.code:     @required this.activeColor,
      @required this.radius,
      @required this.progress,
      CupertinoActivityIndicatorIOSVersionStyle iOSVersionStyle =
          CupertinoActivityIndicatorIOSVersionStyle.iOS13,
    })  : alphaValues = _kAlphaValuesMap[iOSVersionStyle],
          tickFundamentalRRect = RRect.fromLTRBXY(
            -radius / _kDefaultIndicatorRadius,
            -radius /
                (iOSVersionStyle ==
                        CupertinoActivityIndicatorIOSVersionStyle.iOS14
                    ? 3.0
                    : 2.0),
            radius / _kDefaultIndicatorRadius,
            -radius,
            radius / _kDefaultIndicatorRadius,
  
negative.code:   ///
    /// Defaults to 1.0. Must be between 0.0 and 1.0 inclusive, and cannot be null.
    final double progress;
  
    @override
    _CupertinoActivityIndicatorState createState() =>
  