flutter qr_flutter二维码库填充不满问题解决方案

 全局搜索找到_PaintMetrics类的_calculateMetrics()方法，将

_pixelSize = (pixelSize * 2).roundToDouble() / 2;

这一行代码注释掉，然后添加_pixelSize = pixelSize这行代码，完整代码如下：

class _PaintMetrics {
  _PaintMetrics({
    required this.containerSize,
    required this.gapSize,
    required this.moduleCount,
  }) {
    _calculateMetrics();
  }

  final int moduleCount;
  final double containerSize;
  final double gapSize;

  late final double _pixelSize;
  double get pixelSize => _pixelSize;

  late final double _innerContentSize;
  double get innerContentSize => _innerContentSize;

  late final double _inset;
  double get inset => _inset;

  void _calculateMetrics() {
    final gapTotal = (moduleCount - 1) * gapSize;
    final pixelSize = (containerSize - gapTotal) / moduleCount;
    // _pixelSize = (pixelSize * 2).roundToDouble() / 2;  // 注释掉这行
    _pixelSize = pixelSize; // 添加这行代码，将pixelSize 直接赋值给_pixelSize 
    _innerContentSize = (_pixelSize * moduleCount) + gapTotal;
    _inset = (containerSize - _innerContentSize) / 2;
  }
}

qr_flutter二维码库修正 - 简书