flutter - Navigator.of(context).pop() 给我黑屏

Question

新人在这里。我用 flutter 制作了一个更新检查器，但如果我选择任何按钮，它会给我黑屏。我怎样才能解决这个问题？有什么想法吗？

代码

• 完整来源:https://github.com/aroxu/LiteCalculator
• 对话部分来源:

import 'package:LiteCalculator/updater/bean/UpdaterBean.dart';
import 'package:flutter/material.dart';

class UpdateHolder extends StatelessWidget {
  final List<Version> version;

  UpdateHolder({Key key, this.version}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return calculateResult(
        version[0].latestVersion, version[1].currentVersion, context);
  }

  Widget calculateResult(latestVersion, currentVersion, context) {
    print('Latest Version : ${int.parse(latestVersion)}');
    print('Current Version : ${int.parse(currentVersion)}');
    Widget data;
    if ((int.parse(currentVersion) <= int.parse(latestVersion))) {
      data = Center(
        child: createAlert('Update Required', actions: <Widget>[
          FlatButton(
            child: Text('OK'),
            onPressed: () {
              print('OK Button Pressed.');
              Navigator.of(context).pop();
            },
          ),
          FlatButton(
            child: Text('Later'),
            onPressed: () {
              print('Later Button Pressed.');
              Navigator.of(context).pop();
            },
          ),
        ]),
      );
    } else
      data = Center();
    return data;
  }

  Widget createAlert(content, {List<Widget> actions, title}) {
    AlertDialog snackBar;
    snackBar = AlertDialog(
      content: Text(content),
      actions: actions,
    );
    return snackBar;
  }
}

Answer 1

为你的弹出窗口调用它，

void showDialogPopup(){
      showDialog(
        context: context,
        builder: (_)=>AlertDialog(
          backgroundColor: Colors.transparent,
          content: Container(
          child: Center(
             child: FlatButton(
               onPressed: (){
                 Navigator.of(context).pop(null);
               },
               child: Center(
                 child: Text("close")
               )
             )
           )
          )
        )
      );
    }