在 Flutter 中,容器具有填充:
padding: const EdgeInsets.only(
left: MyMeasurements.globalLeftPadding,
right: 20.0,
),
我希望能够覆盖“左”。
如果这样做,我会收到运行时错误:
class MySectionHeader extends StatelessWidget {
final double left;
MySectionHeader({
this.left,
});
// down to the widget body
padding: const EdgeInsets.only(
left: left ?? MyMeasurements.globalLeftPadding,
right: 20.0,
),
// and in the container that has the override...
new MySectionHeader(
left: 12.0,
),
这也会出现运行时错误:
padding: const EdgeInsets.only(
left: left ?? 14.0,
right: 20.0,
),
// and in the container that has the override...
new MySectionHeader(
left: 12.0,
),
建议?
最佳答案
您不能同时使用 const
构造函数和动态内容。
改为 new EdgeInsets.only(
https://stackoverflow.com/questions/47165288/