StatefulWidget项目的Listview [英] Listview of item of StatefulWidget

问题描述

一旦放置了StatefulWidget，(屏幕外的项目)如何获取StatefulWidget的状态?

Once the StatefulWidget dispose, (item out of screen) how to retrieve the state of the StatefulWidget?

我实际上是设置了一个动画列表，但是我认为这也是一个问题.可能会更新列表，可能会解决问题.但是如何?

I'm actually set a animatedlist but I think it's the same probleme. May be update the list might solved the probleme. But how?

我只想要相同的状态.

推荐答案

您需要保留需要保存的State才能使用AutomaticKeepAliveClientMixin.

You'll want the State that needs to be preserved to use AutomaticKeepAliveClientMixin.

这是一个例子:

class Foo extends StatefulWidget {
  @override
  FooState createState() {
    super.build(context);
    return new FooState();
  }
}

class FooState extends State<Foo> with AutomaticKeepAliveClientMixin {
  @override
  Widget build(BuildContext context) {
    return Container(

    );
  }

  @override
  bool get wantKeepAlive => true;
}

即使Foo小部件将屏幕留在ListView

Such Foo widget will preserve its state even if it leaves the screen inside a ListView

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