如何“A RenderFlex 在底部溢出 61 個像素。” 在 android 虛擬鍵盤的頂部

Question

這是用戶界面。 下面是 main.dart 文件和錯誤信息 我在我的 Flutter 應用程序中使用文本字段，它在虛擬鍵盤的頂部給出了渲染 flex 錯誤。 請檢查以下代碼。 在底部，我添加了錯誤消息。 之前我嘗試了所有其他方法來解決問題，但我沒有

import 'package:flutter/material.dart';
import './transaction.dart';
import 'package:intl/intl.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Expenses Tracker',
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  final List<Transaction> transactions = [
    Transaction(
      id: 't1',
      title: 'New Shoes',
      amount: 87.25,
      date: DateTime.now(),
    ),
    Transaction(
      id: 't2',
      title: 'Weekly Groceries',
      amount: 83.25,
      date: DateTime.now(),
    ),
  ];

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Expenses Tracker'),
      ),
      body: Column(
        children: <Widget>[
          Container(
            width: double.infinity,
            child: Card(
              child: Text("Chart!"),
              color: Colors.deepOrange,
              elevation: 9,
            ),
          ),
          Card(
            elevation: 5,
            child: Container(
              padding: EdgeInsets.all(10),
              child: Column(
                children: <Widget>[
                  TextField(
                    decoration: InputDecoration(labelText: 'Title'),
                  ),
                  TextField(
                    decoration: InputDecoration(labelText: 'Amount'),
                  ),
                ],
              ),
            ),
          ),
          Column(
            children: transactions.map((tx) {
              return Card(
                child: Row(
                  children: <Widget>[
                    Container(
                      margin: EdgeInsets.symmetric(
                        vertical: 10,
                        horizontal: 15,
                      ),
                      decoration: BoxDecoration(
                        border: Border.all(
                          color: Colors.purple,
                          width: 3,
                        ),
                      ),
                      padding: EdgeInsets.all(10),
                      child: Text(
                        '\$ ${tx.amount}',
                        style: TextStyle(
                          fontWeight: FontWeight.bold,
                          fontSize: 20,
                          color: Colors.purple,
                        ),
                      ),
                    ),
                    Column(
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: <Widget>[
                        Text(
                          tx.title,
                          style: TextStyle(
                            fontWeight: FontWeight.bold,
                            fontSize: 18,
                          ),
                        ),
                        Text(
                          DateFormat.yMMMEd().format(tx.date),
                          style: TextStyle(color: Colors.grey, fontSize: 14),
                        ),
                      ],
                    ),
                  ],
                ),
              );
            }).toList(),
          ),
        ],
      ),
    );
  }
}

下面是錯誤。

════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during layout:
A RenderFlex overflowed by 61 pixels on the bottom.
The relevant error-causing widget was:
  Column 
lib\main.dart:41
The overflowing RenderFlex has an orientation of Axis.vertical.
The edge of the RenderFlex that is overflowing has been marked in the rendering with a yellow and
black striped pattern. This is usually caused by the contents being too big for the RenderFlex.
Consider applying a flex factor (e.g. using an Expanded widget) to force the children of the
RenderFlex to fit within the available space instead of being sized to their natural size.
This is considered an error condition because it indicates that there is content that cannot be
seen. If the content is legitimately bigger than the available space, consider clipping it with a
ClipRect widget before putting it in the flex, or using a scrollable container rather than a Flex,
like a ListView.
The specific RenderFlex in question is: RenderFlex#0559b relayoutBoundary=up1 OVERFLOWING:
  needs compositing
  creator: Column ← _BodyBuilder ← MediaQuery ← LayoutId-[<_ScaffoldSlot.body>] ←
    CustomMultiChildLayout ← AnimatedBuilder ← DefaultTextStyle ← AnimatedDefaultTextStyle ←
    _InkFeatures-[GlobalKey#39d3c ink renderer] ← NotificationListener<LayoutChangedNotification> ←
    PhysicalModel ← AnimatedPhysicalModel ← ⋯
  parentData: offset=Offset(0.0, 80.0); id=_ScaffoldSlot.body (can use size)
  constraints: BoxConstraints(0.0<=w<=360.0, 0.0<=h<=263.0)
  size: Size(360.0, 263.0)
  direction: vertical
mainAxisAlignment: start
  mainAxisSize: max
  crossAxisAlignment: center
  verticalDirection: down

════════════════════════════════════════════════════════════════════════════════════════════════════

Answer 1

1. 一個快速的解決方案是在鍵盤打開時阻止Scaffold內的小部件來調整自己的大小，但是這樣，

某些小部件可能會obscured鍵盤obscured

我們可以使用Scaffold小部件上的resizeToAvoidBottomInset屬性來做到這一點。

例子：

 return Scaffold(
      resizeToAvoidBottomInset: false,   //new line
      appBar: AppBar(
        title: Text('Expenses Tracker'),
      ),
      body: Column(
          children: <Widget>[
            ...... // other widgets 
          ],
      ),
    );

---

2. 另一種解決方案是將Column小部件包裝到一個可滾動的小部件中。 Flutter提供的一個運行良好的內置小部件是SingleChildScrollView 。 這是避免鍵盤打開時出現“Bottom overflowed”錯誤的最佳解決方案。

 return Scaffold(
      appBar: AppBar(
        title: Text('Expenses Tracker'),
      ),
      body: SingleChildScrollView( // wrap with a scrollable widget
        child: Column(
          children: <Widget>[
            ...... // other widgets 
          ],
        ),
      ),
    );

Answer 2

嘗試在您的Scaffold設置resizeToAvoidBottomInset: false,

像這樣。

Scaffold(
 resizeToAvoidBottomInset: false,
 ...
)

Answer 3

您必須使用 SingleChildScrollView 。 這意味着可以滾動單個小部件的框。 所以首先去 colums ctrls+Shift+R 你可以獲得 wrapwith 小部件並單擊它並添加 SingleChildScrollView

Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Expenses Tracker'),
      ),
      body: SingleChildScrollView(child:Column(
        children: <Widget>[
          Container(
            width: double.infinity,
            child: Card(
              child: Text("Chart!"),
              color: Colors.deepOrange,
              elevation: 9,
            ),
          ),).