底部被 Infinity 像素溢出的 RenderFlex [英] A RenderFlex overflowed by Infinity pixels on the bottom
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问题描述
我有一个非常简单的控件，我试图在其中显示带有几个 TextFields 的 DropdownButton.
当应用程序在模拟器中运行时，我收到一条错误消息
I have a very simple control where I am trying to show a DropdownButton with a couple of TextFields.
When the app runs in the emulator, I get an error saying
BOTTOM OVERFLOWED BY Infinity PIXELS
Stack Trace 提示了该问题并指向了一些相关文档，但是对于 Flutter 来说非常新，我不确定需要更改什么.
The Stack Trace hints at the issue and points to some relevant documentation, but being very new to Flutter, I'm not sure what needs to be changed.
我根据类似错误的问题尝试了许多建议，但没有任何运气.
I have tried many of the suggestions based on the questions about similar errors, but have not had any luck.
堆栈跟踪:
I/flutter (10708): ══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════
I/flutter (10708): The following assertion was thrown during performLayout():
I/flutter (10708): RenderIndexedStack object was given an infinite size during layout.
I/flutter (10708): This probably means that it is a render object that tries to be as big as possible, but it was put
I/flutter (10708): inside another render object that allows its children to pick their own size.
I/flutter (10708): The nearest ancestor providing an unbounded width constraint is:
I/flutter (10708): RenderFlex#1d3ef relayoutBoundary=up7 NEEDS-LAYOUT NEEDS-PAINT
I/flutter (10708): creator: Row ← Padding ← Container ← DefaultTextStyle ← Stack ← Listener ← _GestureSemantics ←
I/flutter (10708): RawGestureDetector ← GestureDetector ← Semantics ← DropdownButton<String> ← Column ← ⋯
I/flutter (10708): parentData: offset=Offset(0.0, 0.0) (can use size)
I/flutter (10708): constraints: BoxConstraints(0.0<=w<=391.4, 0.0<=h<=Infinity)
I/flutter (10708): size: MISSING
I/flutter (10708): direction: horizontal
I/flutter (10708): mainAxisAlignment: spaceBetween
I/flutter (10708): mainAxisSize: min
I/flutter (10708): crossAxisAlignment: center
I/flutter (10708): textDirection: ltr
I/flutter (10708): verticalDirection: down
I/flutter (10708): The nearest ancestor providing an unbounded height constraint is:
I/flutter (10708): RenderFlex#bb3f8 relayoutBoundary=up1 NEEDS-LAYOUT NEEDS-PAINT
I/flutter (10708): creator: Column ← MediaQuery ← LayoutId-[<_ScaffoldSlot.body>] ← CustomMultiChildLayout ←
I/flutter (10708): AnimatedBuilder ← DefaultTextStyle ← AnimatedDefaultTextStyle ← _InkFeatures-[GlobalKey#6a13f ink
I/flutter (10708): renderer] ← NotificationListener<LayoutChangedNotification> ← PhysicalModel ←
I/flutter (10708): AnimatedPhysicalModel ← Material ← ⋯
I/flutter (10708): parentData: offset=Offset(0.0, 0.0); id=_ScaffoldSlot.body (can use size)
I/flutter (10708): constraints: BoxConstraints(0.0<=w<=391.4, 0.0<=h<=659.9)
I/flutter (10708): size: MISSING
I/flutter (10708): direction: vertical
I/flutter (10708): mainAxisAlignment: start
I/flutter (10708): mainAxisSize: max
I/flutter (10708): crossAxisAlignment: center
I/flutter (10708): verticalDirection: down
I/flutter (10708): The constraints that applied to the RenderIndexedStack were:
I/flutter (10708): BoxConstraints(unconstrained)
I/flutter (10708): The exact size it was given was:
I/flutter (10708): Size(Infinity, Infinity)
I/flutter (10708): See https://flutter.io/layout/ for more information.
为了简洁起见，此处的代码已删除 TextFields，因为无论有无它们都会发生错误.
The code here has has the TextFields removed for brevity as the error occurs with or without them.
代码
import 'package:flutter/material.dart';
import 'package:todo_app/model/todo.dart';
import 'package:todo_app/util/dbhelper.dart';
import 'package:intl/intl.dart';
class TodoDetail extends StatefulWidget {
Todo todo;
TodoDetail(Todo todo) {
this.todo = todo;
debugPrint("called ctor with " + todo.title + "!!");
}
@override
State<StatefulWidget> createState() => TodoDetailState(todo);
}
class TodoDetailState extends State {
final Todo todo;
TodoDetailState(this.todo);
final _priorites = ["High, Medium", "Low"];
String _priority = "Low";
TextEditingController titleController = TextEditingController();
TextEditingController descriptionController = TextEditingController();
@override
Widget build(BuildContext context) {
titleController.text = todo.title;
descriptionController.text = todo.description;
TextStyle textStyle = Theme.of(context).textTheme.title;
return Padding(
padding: EdgeInsets.only(top: 35, right: 10, left: 10),
child: Scaffold(
appBar: AppBar(
automaticallyImplyLeading: false,
title: Text('Add New'), //todo.title
),
body: Column(children: <Widget>[
DropdownButton<String>(
isExpanded: true,
items: _priorites.map((String value) {
return DropdownMenuItem<String>(
value: value, child: Text(value));
}).toList(),
style: textStyle,
value: "Low",
onChanged: null)
])));
//);
}
}
推荐答案
试着用固定宽度的 Container 包裹 DropdownButton.
Just try to wrap Container with fixed width around the DropdownButton.
@override
Widget build(BuildContext context) {
titleController.text = todo.title;
descriptionController.text = todo.description;
TextStyle textStyle = Theme.of(context).textTheme.title;
return Padding(
padding: EdgeInsets.only(top: 35, right: 10, left: 10),
child: Scaffold(
appBar: AppBar(
automaticallyImplyLeading: false,
title: Text('Add New'), //todo.title
),
body: Container(
height: 200,
child: Column(
children: <Widget>[
Container(
// don't forget about height
height: 200,
child: DropdownButton<String>(
isExpanded: true,
items: _priorites.map((String value) {
return DropdownMenuItem<String>(
value: value, child: Text(value));
}).toList(),
style: textStyle,
value: "Low",
onChanged: null,
),
)
],
),
),
),
);
}
这篇关于底部被 Infinity 像素溢出的 RenderFlex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IT屋！
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