title: Flutter scroll issue - A RenderFlex overflowed by 192 pixels on the bottom
body: <p>I'm building a form with 4-5 form fields. However, when I try to enter the data, it throws the below error</p>
  
  <pre><code>Performing hot reload...
  Syncing files to device sdk gphone x86 64...
  Reloaded 3 of 512 libraries in 363ms.
  W/IInputConnectionWrapper(21437): getTextBeforeCursor on inactive InputConnection
  W/IInputConnectionWrapper(21437): getSelectedText on inactive InputConnection
  W/IInputConnectionWrapper(21437): getTextAfterCursor on inactive InputConnection
  W/IInputConnectionWrapper(21437): beginBatchEdit on inactive InputConnection
  W/IInputConnectionWrapper(21437): endBatchEdit on inactive InputConnection
  
  ════════ Exception caught by rendering library ═════════════════════════════════════════════════════
  The following assertion was thrown during layout:
  A RenderFlex overflowed by 192 pixels on the bottom.
  
  The relevant error-causing widget was: 
    Column file:///C:/Users/xyz/Documents/quizmaker/lib/views/signup.dart:54:20
  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#322a5 relayoutBoundary=up2 OVERFLOWING
  ...  needs compositing
  ...  parentData: offset=Offset(24.0, 0.0) (can use size)
  ...  constraints: BoxConstraints(0.0&lt;=w&lt;=363.4, 0.0&lt;=h&lt;=321.1)
  ...  size: Size(363.4, 321.1)
  ...  direction: vertical
  ...  mainAxisAlignment: start
  ...  mainAxisSize: min
  ...  crossAxisAlignment: start
  ...  textDirection: ltr
  ...  verticalDirection: down
  ◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤
  ════════════════════════════════════════════════════════════════════════════════════════════════════
  </code></pre>
  
  <p>Here is my code </p>
  
  <pre><code>import 'package:flutter/material.dart';
  import 'package:quizmaker/services/auth.dart';
  import 'package:quizmaker/views/home.dart';
  import 'package:quizmaker/views/signin.dart';
  import 'package:quizmaker/widgets/widgets.dart';
  
  class SignUp extends StatefulWidget {
    @override
    _SignUpState createState() =&gt; _SignUpState();
  }
  
  class _SignUpState extends State&lt;SignUp&gt; {
  
    final _formKey = GlobalKey&lt;FormState&gt;();
    String sName, fName, lName, email, phone, password;
    AuthService authService = new AuthService();
    bool _isLoading = false;
  
    signUp() async {
      if(_formKey.currentState.validate()){
        setState(() {
          _isLoading = true;
        });
        authService.signUpWithEmailAndPass(email, password).then((value){
          if(value != null){
            setState(() {
              _isLoading = false;
            });
            Navigator.pushReplacement(context, MaterialPageRoute(
              builder: (context) =&gt; Home()
            ));
          }
          });
      }
    }
  
    @override
    Widget build(BuildContext context) {
      return Scaffold(
        appBar: AppBar(
          title: appBar(context),
          centerTitle: true,
          backgroundColor: Colors.transparent,
          elevation: 0.0,
          brightness: Brightness.light,
        ),
        body: _isLoading ? Container(
          child: Center(child: CircularProgressIndicator(),),
        ) : Form(
          key: _formKey,
          child: Container(
            padding: EdgeInsets.symmetric(horizontal: 24),
            child: Container(
              child: Column(
                mainAxisSize: MainAxisSize.min,
                crossAxisAlignment: CrossAxisAlignment.start,
                children: &lt;Widget&gt;[
                Spacer(),
                TextFormField(
                  validator: (val){
                    return val.isEmpty ? "Enter School Name" : null ;
                  } ,
                  decoration: InputDecoration(
                      hintText: "School Name"
                  ),
                  onChanged:  (val){
                    sName = val;
                  },
                ),
                SizedBox(height: 6,),
                TextFormField(
                  validator: (val){
                    return val.isEmpty ? "Enter First Name" : null ;
                  } ,
                  decoration: InputDecoration(
                      hintText: "First Name"
                  ),
                  onChanged:  (val){
                    fName = val;
                  },
                ),
                SizedBox(height: 6,),
                TextFormField(
                  validator: (val){
                    return val.isEmpty ? "Enter Last Name" : null ;
                  } ,
                  decoration: InputDecoration(
                      hintText: "Last Name"
                  ),
                  onChanged:  (val){
                    lName = val;
                  },
                ),
                SizedBox(height: 6,),
                TextFormField(
                  validator: (val){
                    return val.isEmpty ? "Enter Emailid" : null ;
                  } ,
                  decoration: InputDecoration(
                      hintText: "Email"
                  ),
                  onChanged:  (val){
                    email = val;
                  },
                ),
                SizedBox(height: 6,),
                TextFormField(
                  validator: (val){
                    return val.isEmpty ? "Enter Phone Number" : null ;
                  } ,
                  decoration: InputDecoration(
                      hintText: "Phone"
                  ),
                  onChanged:  (val){
                    phone = val;
                  },
                ),
                SizedBox(height: 6,),
                TextFormField(
                  obscureText: true,
                  validator: (val){
                    return val.isEmpty ? "Enter Password" : null ;
                  } ,
                  decoration: InputDecoration(
                      hintText: "Password"
                  ),
                  onChanged:  (val){
                    password = val;
                  },
                ),
                SizedBox(height: 24,),
                GestureDetector(
                  onTap: (){
                    signUp();
                  },
                  child: Container(
                    padding: EdgeInsets.symmetric(vertical: 18),
                    decoration: BoxDecoration(
                        color: Colors.blue,
                        borderRadius: BorderRadius.circular(30)
                    ),
                    alignment: Alignment.center,
                    width: MediaQuery.of(context).size.width - 48,
                    child: Text("Register", style: TextStyle(color: Colors.white, fontSize: 16),),
                  ),
                ),
                SizedBox(height: 18,),
                Row(
                  mainAxisAlignment: MainAxisAlignment.center,
                  mainAxisSize: MainAxisSize.min,
                  children: &lt;Widget&gt;[
                    Text("Already have an account? ", style: TextStyle(fontSize: 15.5),),
                    GestureDetector(
                      onTap: (){
                        Navigator.pushReplacement(context, MaterialPageRoute(
                        builder: (context) =&gt; SignIn()
                        ));
                      },
  
                        child: Text("Sign in", style: TextStyle(fontSize: 15.5, decoration: TextDecoration.underline),))
  
                  ],
                ),
  
                SizedBox(height: 80,),
  
              ],
              ),
            ),
          ),
        ),
      );;
    }
  }
  </code></pre>
  
  <p>I tried adding Expanded to the children, it removes the error, but the form fields become very small while entering the data. Tried wrapping column in SingleChildScrollView, but it gives me the below</p>
  
  <blockquote>
    <p>RenderFlex children have non-zero flex but incoming height constraints are unbounded</p>
  </blockquote>
  
  <p>Can anyone suggest what it is that I'm doing wrong?</p>
  
  <p>Thanks!</p>