Question

我在我的“彩虹”中遇到一个问题,即钥匙板在案文栏目中打字或删除一个特性后自动开除。我有一份清单,列出含有文稿田的、可允许的植被。然而,每当我打字或删除文本表格中的一种特性时,关键板就突然放弃。

我的法典:

import  package:flutter/material.dart ;
import  package:r6stats/scanner_result.dart ;

class PlayerEditor extends StatefulWidget {
  const PlayerEditor({super.key, required this.playerNames});

  final List<String> playerNames;

  @override
  State<PlayerEditor> createState() => _PlayerEditorState();
}

class _PlayerEditorState extends State<PlayerEditor> {

  @override
  Widget build(BuildContext context) {
    List<String> players = widget.playerNames;

    return Scaffold(
      appBar: AppBar(
        title: const Text("Edit Players"),
        actions: [
          IconButton(
              onPressed: () {
                Navigator.of(context).push(
                  MaterialPageRoute(
                    builder: (context) => ScannerResult(playerNames: players),
                  ),
                );
              },
              icon: const Icon(Icons.check))
        ],
      ),
      body: ListView.builder(
        itemCount: players.length,
        itemBuilder: (context, index) => Padding(
          padding: const EdgeInsets.all(8),
          child: Dismissible(
            key: UniqueKey(),
            direction: DismissDirection.startToEnd,
            onDismissed: (direction) {
              final playerName = players[index];
              ScaffoldMessenger.of(context).showSnackBar(SnackBar(
                content: Text("${players[index]} dismissed"),
                action: SnackBarAction(
                  label:  UNDO ,
                  onPressed: () {
                    setState(() {
                      players.insert(index, playerName);
                    });
                  },
                ),
              ));
              setState(() {
                players.removeAt(index);
              });
            },
            background: Container(
              color: Colors.red,
              alignment: Alignment.centerLeft,
              padding: const EdgeInsets.only(left: 20.0),
              child: const Icon(Icons.delete, color: Colors.white),
            ),
            child: ListTile(
              tileColor: const Color.fromRGBO(194, 194, 194, 100),
              shape: const RoundedRectangleBorder(
                  side: BorderSide(color: Colors.black, width: 1)),
              title: TextFormField(
                initialValue: players[index],
                onChanged: (newValue) {
                  setState(() {
                    players[index] = newValue;
                  });
                },
                style: Theme.of(context)
                    .textTheme
                    .titleMedium!
                    .copyWith(color: Colors.black),
                decoration: const InputDecoration(
                  border: InputBorder.none,
                  focusedBorder: InputBorder.none,
                  hintText:  Enter player name ,
                ),
              ),
              titleTextStyle: Theme.of(context)
                  .textTheme
                  .titleMedium!
                  .copyWith(color: Colors.black),
            ),
          ),
        ),
      ),
    );
  }
}

I ve Trial using GlobalKey for the ListView. 每一可忽略的植被的建筑群和独木块,但问题依然存在。我如何防止主板在打字或去除特性后自动开除?

任何见解或建议都将受到高度赞赏。谢谢!

Answer 1

我认为,你的法典可能有两个问题。

Since you are changing the list of players, and you can not change the value of widget.playerNames, you must copy the List items. So, do this:

List<String> players = [...widget.playerNames];

You don t need to use setState in your onChanged method.

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