由于它是一个可选值,因此有时它将为空,那么我如何避免其抛出错误?这是唯一的方法吗?
class QText extends StatelessWidget {
QText(this.text, this.size, [this.bold]);
final String text;
final double size;
bool bold;
@override
Widget build(BuildContext context) {
bold = (bold == null) ? false : bold;
return Whatever..
}
}
我想这样做,但显然它不起作用:
class QText extends StatelessWidget {
QText(this.text, this.size, [this.bold]);
final String text;
final double size;
final bool bold ?? false;
@override
Widget build(BuildContext context) {
return Whatever..
}
}