如何在没有 Renderflex 溢出错误的情况下动态更改 Container/PageView 的大小

问题描述

我有一个里面有一个 PageView 的容器，里面有一些列。每当页面更改时，都会为容器的高度分配不同的高度。如果当前页面的大小为 350，而下一个页面的大小应为 735，我会收到“RenderFlex 溢出底部 355 像素”错误。

GIF to demonstrate the problem

代码如下：

child: Container(
  height: _pageViewHeight,child: PageView(
    controller: _pageController,onPageChanged: (int page) {
      setState(() {
        _currentPage = page;
        _pageViewHeight = _heights[page];
      });
    },children: <Widget>[

      Column(
        children: <Widget>[
          Padding(
            padding: EdgeInsets.symmetric(vertical: 60),child: Image(
              image: AssetImage('assets/images/3_todo.png'),width: 100,height: 100,),],Column(
        children: <Widget>[
          Padding(
            padding: const EdgeInsets.all(8.0),child: Align(
              child: Text(
                "Download your data",style: TextStyle(
                  fontSize: 32,color: Colors.white,Padding(
            padding: const EdgeInsets.all(8.0),child: Image(
                image: AssetImage(
              'assets/images/json_tutorial.gif',)),]),Row(
    children: [_button(_currentPage)],)

_heights[] 包含两个高度。

当我转到第二页时，出现以下错误：

════════ Exception caught by rendering library ═════════════════════════════════
The following assertion was thrown during layout:
A RenderFlex overflowed by 355 pixels on the bottom.

The relevant error-causing widget was
Column
lib\views\onboarding.dart:176
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.

This is how it looks like while changing

And this is how it looks when changed

有没有办法在没有这个错误的情况下动态改变尺寸？

解决方法

使用媒体查询解决您的问题。全屏比例为1，现在定义一个比例，不会溢出。

Var ratio = MediaQuery.of(context).size;

container(height: ratio.height * 0.5,width : ratio.width*0.5,child: yourWidget(),)