Flutter 如何在Dart/FLIFT中扩展类
我有甲级:Flutter 如何在Dart/FLIFT中扩展类,flutter,dart,Flutter,Dart,我有甲级: class A{ String title; String content; IconData iconData; Function onTab; A({this.title, this.content, this.iconData, this.onTab}); } 如何创建类B,该类B使用以下附加变量扩展类A: class B extends A{ bool read; B({this.read}); } 试过了,但没用
class A{
String title;
String content;
IconData iconData;
Function onTab;
A({this.title, this.content, this.iconData, this.onTab});
}
如何创建类B,该类B使用以下附加变量扩展类A:
class B extends A{
bool read;
B({this.read});
}
试过了,但没用
let o = new B(
title: "New notification",
iconData: Icons.notifications,
content: "Lorem ipsum doro si maet 100",
read: false,
onTab: (context) => {
});
您必须在子类上定义构造函数
class B extends A {
bool read;
B({title, content, iconData, onTab, this.read}) : super(title: title, content: content, iconData: iconData, onTab: onTab);
}