PIN Input Field in Flutter

Published December 30, 2019

Hello guys, in this post we are going to learn how to design PIN input fileds in Flutter.

With pin_code_fields: ^2.3.0+3 plugin we can achive this one

Lets check the Image below

Now we are going to design this

Lets check the code

Add pin_code_fields: ^2.3.0+3 in pubspec.yaml file under dev_dependencies

dev_dependencies:
  pin_code_fields: ^2.3.0+3

import 'package:pin_code_fields/pin_code_fields.dart' in your dart file

import 'package:pin_code_fields/pin_code_fields.dart'

Here i have used background image which is added inside assets folder with name backgrnd.png.

To access this image file in dart file we need to add this file path in pubspec.yaml file

assets:
  - assets/backgrnd.png

Now lets add PinCodeTextField widget to our dart file where we are going to show the PIN fileds.

PinCodeTextField(
length: 4,
obsecureText: true,
animationType: AnimationType.fade,
shape: PinCodeFieldShape.box,
animationDuration: Duration(milliseconds: 300),
borderRadius: BorderRadius.circular(5),
fieldHeight: 50,
fieldWidth:50,

)

Here we are going to use 4 digits PIN number.

By using the length property we can fix the PIN length.

Properties of PinCodeTextField

Property	Default/Meaning
length	@required, defines the length of the PIn
obsecureText	default value is false, if its true will hide the pin
onCompleted	returns once all PIN fileds entered
fieldHeight	define the height of the field
fieldWidth	define the width of the field
activeColor	Colors of the input fields which have inputs. Default is [Colors.green]
selectedColor	Color of the input field which is currently selected. Default is [Colors.blue]
inactiveColor	Colors of the input fields which don't have inputs. Default is [Colors.red]
enabled	Enable or disable the Field. Default is [true]
animationType	[AnimationType] for the text to appear in the pin code field. Default is [AnimationType.slide]
textInputType	[TextInputType] for the pin code fields. default is [TextInputType.visiblePassword]
autoFocus	If the pin code field should be autofocused or not. Default is [false]
controller	[TextEditingController] to control the text manually. Sets a default [TextEditingController()] object if none given

Open Number Keyboard and Text keybord

By using the textInputType we can achieve to show only numbers with signed/ decimal or Text keyboard.

How to hide/show PIN value?

By using the obsecureText property we can achieve this.

obsecureText: true,

obsecureText: false,

Now Check Complete code

import 'package:flutter/material.dart';
import 'package:pin_code_fields/pin_code_fields.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(

        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {


  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage>  {

var value;
  @override
  void initState() {
    // TODO: implement initState
    super.initState();
    value="";

  }
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return SafeArea(
      child: Scaffold(
          body: Container(
            child: Stack(
              children: <Widget>[

                Positioned(child: Image.asset("assets/backgrnd.png",fit: BoxFit.fitHeight,),
                left: 0,right: 0,)
                ,
                Center(
                  child: Container(
                    width: 300,
                    color: Colors.white,
                    child: Padding(
                      padding: const EdgeInsets.all(12.0),
                      child: Column(
                        mainAxisSize: MainAxisSize.min,
                        mainAxisAlignment: MainAxisAlignment.spaceBetween,

                        children: <Widget>[
                          Text("Enter your 4 digit OTP ",style: TextStyle(fontSize: 20,color: Colors.indigoAccent[700]),),
                          SizedBox(height: 30,),
                          PinCodeTextField(
                            onCompleted:(_value){
                              print("values entered $value");
                              value=_value;
                            },
                            textInputType: TextInputType.emailAddress,
                            length: 4,
                            obsecureText: true,
                            animationType: AnimationType.fade,
                            shape: PinCodeFieldShape.box,
                            animationDuration: Duration(milliseconds: 300),
                            borderRadius: BorderRadius.circular(5),
                            fieldHeight: 50,
                            fieldWidth:50,

                          ),
                          SizedBox(height: 30,),
                          RaisedButton(
                            color:Colors.indigoAccent[700],

                            onPressed: (){
                              Scaffold.of(context).showSnackBar(SnackBar(content: Text("Entered PIN $value")));
                            },child: Text("Submit",style: TextStyle(fontSize: 20,color: Colors.white)),)
                        ],
                      ),
                    ),
                  ),
                ),
              ],

            ),
          ),
        ),

    );
  }

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