问题描述

我的问题是我想要一个 TabBarView 在 SingleChildScrollView 中，但它给了我这个错误:RenderFlex 子级具有非零 flex 但传入的高度约束是无界的.

My problem is that I want a TabBarView inside a SingleChildScrollView but it gives me this error: RenderFlex children have non-zero flex but incoming height constraints are unbounded.

如果我删除 SingleChildScrollView 它可以工作，但我需要该小部件，因为我想推送一个 ListView，它可以使用 TabBar 滚动，例如 Instagram.

If I remove the SingleChildScrollView it works but I need the widget because then I want to push a ListView that it scrolls with the TabBar, like Instagram.

代码:

import 'package:flutter/material.dart';

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

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> with SingleTickerProviderStateMixin {
  TabController tabController;

  @override
  void initState() {
    super.initState();
    tabController = new TabController(length: 2, vsync: this);
  }

  @override
  void dispose() {
    tabController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        home: Scaffold(
            body: SingleChildScrollView(
      child: Column(
        children: [
          TabBar(
            controller: tabController,
            tabs: [
              Tab(
                icon: Icon(
                  Icons.photo_library,
                  size: 30,
                ),
              ),
              Tab(
                icon: Icon(
                  Icons.perm_media,
                  size: 30,
                ),
              ),
            ],
            labelColor: Colors.deepOrange,
            unselectedLabelColor: Colors.black,
            indicatorColor: Colors.deepOrange,
          ),
          Expanded(
            child: TabBarView(controller: tabController, children: [
              Expanded(child: Container()),
              Expanded(child: Container())
            ]),
          ),
        ],
      ),
    )));
  }
}

变化:

import 'package:flutter/material.dart';

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

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> with SingleTickerProviderStateMixin {
  TabController tabController;

  @override
  void initState() {
    super.initState();
    tabController = new TabController(length: 2, vsync: this);
  }

  @override
  void dispose() {
    tabController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        home: Scaffold(
            body: Column(
        mainAxisSize: MainAxisSize.min,
        children: [
          TabBar(
            controller: tabController,
            tabs: [
              Tab(
                icon: Icon(
                  Icons.photo_library,
                  size: 30,
                ),
              ),
              Tab(
                icon: Icon(
                  Icons.perm_media,
                  size: 30,
                ),
              ),
            ],
            labelColor: Colors.deepOrange,
            unselectedLabelColor: Colors.black,
            indicatorColor: Colors.deepOrange,
          ),
          Expanded(
            child: SingleChildScrollView(child:TabBarView(controller: tabController, children: [
              Container(),
              Container()
            ]),
          ),)
        ],
      ),
    ));
  }
}

推荐答案

您可以使用 NestedScrollView 来解决这个问题.

You can use NestedScrollView to fix this issue.

下面的代码帮我解决了:

The below code helped me to solve:

NestedScrollView(
      headerSliverBuilder: (context, value) {
        return [
          SliverToBoxAdapter(
              child: Header()
          ),
          SliverToBoxAdapter(
            child: TabBar(
              controller: _controller,
              tabs: [
                Tab(icon: Icon(Icons.x)),
                Tab(icon: Icon(Icons.y)),
                Tab(icon: Icon(Icons.z)),
              ],
            ),
          ),
        ];
      },
    body: Container(
      child: TabBarView(
        controller: _controller,
        children: <Widget>[
          page1(),
          page2(),
          page3(),
        ],
      ),
    ),
  )

更多解释请参考这个答案

这篇关于Flutter:SingleChildScrollView 内的 TabBarView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编程学习网！