Function to return a spinner widget or text depending of the page is still loading

spinner.dart

   // Function to return either a spinner or some text depending on whether a result is available
    Widget loadingSpinner() {
      if (loading == true) {
        return SpinKitDoubleBounce(
          color: Colors.red,
          size: 50,
        );
      } else {
        return Text(
          '$userPercentage%',
          style: kPrimaryTextStyle.copyWith(
              decoration: TextDecoration.underline, fontSize: 44),
        );
      }
    }