问题描述
我想创建一个带有标签的应用程序以获取用户输入.问题是，不同的选项卡获得不同的输入，但是我必须收集数据库的输入.我的主意是，主要的Scaffhold会收集所有Tabs的输入并将其写入数据库中！我的问题是，我不知道将数据从选项卡(另一个文件中的statefullWidget)发送到父类(Scaffold)还是从那里运行函数！
I want to create an App with Tabs to get the users input. The Problem is, that the different Tabs get different inputs, but i have to collect the inputs for the Database. My idea her was, that the main Scaffhold collects the inputs from all Tabs and write it in a database! My Problem is, that i dont know to send data from the tab (statefullWidget in an other file) to the parent class (Scaffold) or run a function from there!
请帮助我，抱歉我的英语不好！
Please help me and sorry for my bad english!
乔纳斯(Jonas)
推荐答案
您可以传递一个 Function ，该函数可以随时调用.
You can pass a Function that can be called whenever you want.
...
class _MamaBear extends State<MamaBear> {
void hungryBear(String babyBear) {
print("$babyBear is hungry");
}
@override
Widget build(BuildContext context) {
return Scaffold(
body: Container(
child: Column(children: <Widget>[
BabyBear(
"Mark",
(babyBear) {
hungryBear(babyBear);
},
)])));}
class BabyBear extends StatefulWidget {
final String babyBearName;
final Function onBearAction;
BabyBear(this.babyBearName, this.onBearAction);
@override
_BabyBear createState() => _BabyBear();
}
class _BabyBear extends State<BabyBear> {
@override
Widget build(BuildContext context) {
return Card(
child: RaisedButton(
child: Text("Mama I'm hungry"),
onPressed: () {
widget.onBearAction(widget.babyBearName);
}),
);
}
}
这篇关于Flutter:将数据从TabBarView(StatefullWidgets)发送回主支架的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！