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Description:

otp pin field

otp_pin_field #
A flutter package which will help you to generate pin code fields with beautiful design and
animations. It's a beautiful and highly customizable Flutter widget for entering pin code.
Created by Shivam Mishra @shivbo96

Usage #
Use this package as a library #

Depend on it Add this to your package's pubspec.yaml file:

dependencies:
otp_pin_field: <VERSION>
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Install it You can install packages from the command line:
with Flutter:

$ flutter packages get
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Alternatively, your editor might support flutter packages get. Check the docs for your editor to
learn more.

Import it Now in your Dart code, you can use:

import 'package:otp_pin_field/otp_pin.dart';
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Properties #

name
type
default
description

fieldCount
int
4
The total length of pin number & the number of pin boxes.

highlightBorder
bool
true
highlight the focused pin box.

activeFieldBorderColor
Color
Colors.black
Set color of the focused pin box.

activeFieldBackgroundColor
Color
Colors.transparent
Set background color of the focused pin box.

defaultFieldBorderColor
Color
Colors.black45
Set color of the unfocused pin box.

defaultFieldBackgroundColor
Color
Colors.transparent
Set background color of the unfocused pin box.

fieldPadding
double
20.0
Set padding for pin box.

fieldBorderRadius
double
2.0
Set border radius for pin box.

fieldBorderWidth
double
2.0
Set border width for pin box.

textStyle
TextStyle
TextStyle(fontSize: 18.0,color: Colors.black,)
TextStyle for styling pin characters.

otpPinFieldInputType
OtpPinFieldInputType
OtpPinFieldInputType.none
Want to show text of otp_pin_field(OtpPinFieldInputType.none) or not(OtpPinFieldInputType.password) or want to show some special character(OtpPinFieldInputType.custom)

otpPinInputCustom
String
"*"
Special character to mask the pin code. Will only work if uses otpPinFieldInputType is set to OtpPinFieldInputType.custom.

onSubmit
void Function(String)

Callback when the max length of pin code is reached.

onChange
void Function(String)

Callback when there is any change in OTP Pin Field.

otpPinFieldStyle
OtpPinFieldStyle
OtpPinFieldStyle()
Customization for the individual pin boxes. Check OtpPinFieldStyle for possible options.

fieldHeight
double
45.0
Height of pin boxes.

fieldWidth
double
70.0
Width of pin boxes.

otpPinFieldDecoration
OtpPinFieldDecoration
OtpPinFieldDecoration.underlinedPinBoxDecoration
Predefine customization for the individual pin boxes. Check OtpPinFieldStyle for possible options and use OtpPinFieldDecoration.custom for fully customization like boarder radius,width, active and default otp_pin_field colors and etc..

keyboardType
TextInputType
TextInputType.number
The type of the input keyboard

autofocus
bool
false
Autofocus on view entered

cursorColor
Color
Color.black
To give color to the cursor

cursorWidth
double
2
To give width to the cursor

showCursor
bool
true
To show cursor in the otp pin fields

mainAxisAlignment
MainAxisAlignment
MainAxisAlignment.center
Manage the spacing in the otp pin fields

upperChild
Widget
Container()
Widget which will show above the otp pin fields only when showCustomKeyboard is set to be true

middleChild
Widget
Container()
Widget which will show between the otp pin fields and Custom Keyboard only when showCustomKeyboard is set to be true

showCustomKeyboard
bool
false
To show custom keyboard in place default keyboard

customKeyboard
Widget

Widget which help you to show your own custom keyboard in place if default custom keyboard

showDefaultKeyboard
bool
true
Bool which manage to show default OS keyboard

autoFillEnable
bool
false
Bool which manage to enable auto fill functionality For Ios it is not needed as the SMS autofill is provided by default, but not for Android, that's where this key is useful.

smsRegex
String
'\d{0,4}'
String which take use to show the OTP from the message

phoneNumbersHint
bool
false
Bool which manage to enable auto fill functionality Is a widget that will allow you ask for system phone number and autofill the widget if a phone is choosen by the user. [Android only]

textInputAction
TextInputAction
TextInputAction.done
In case you want to change the action of keyboard

filledFieldBackgroundColor
Color
Colors.transparent
Set background color of the filled field pin box.

filledFieldBorderColor
Color
Colors.transparent
Set color of the border of filled field pin box.

activeFieldBorderGradient
Gradient

Set gradient border Color for focused field pin box.

filledFieldBorderGradient
Gradient

Set gradient border Color for filled field pin box.

defaultFieldBorderGradient
Gradient

Set gradient border Color for unfocused/default field pin box.

onPhoneHintSelected
Function(String)

Callback when you select the autofill hints.

beforeTextPaste
bool Function(String?)?
null
This callback execute before you copy paste the OTP

Example #

/// Otp pin Controller
final _otpPinFieldController = GlobalKey<OtpPinFieldState>();

OtpPinField(
key: _otpPinFieldController,

///in case you want to enable autoFill
autoFillEnable: false,

///for Ios it is not needed as the SMS autofill is provided by default, but not for Android, that's where this key is useful.
textInputAction: TextInputAction.done,

///in case you want to change the action of keyboard
/// to clear the Otp pin Controller
onSubmit: (text) {
print('Entered pin is $text');

/// return the entered pin
},
onChange: (text) {
print('Enter on change pin is $text');

/// return the entered pin
},
onCodeChanged: (code) {
print('onCodeChanged is $code');
},

/// to decorate your Otp_Pin_Field
otpPinFieldStyle: OtpPinFieldStyle(
/// border color for inactive/unfocused Otp_Pin_Field
// defaultFieldBorderColor: Colors.red,

/// border color for active/focused Otp_Pin_Field
// activeFieldBorderColor: Colors.indigo,

/// Background Color for inactive/unfocused Otp_Pin_Field
// defaultFieldBackgroundColor: Colors.yellow,

/// Background Color for active/focused Otp_Pin_Field
// activeFieldBackgroundColor: Colors.cyanAccent,

/// Background Color for filled field pin box
// filledFieldBackgroundColor: Colors.green,

/// border Color for filled field pin box
// filledFieldBorderColor: Colors.green,
//
/// gradient border Color for field pin box
activeFieldBorderGradient: LinearGradient(colors: [Colors.black, Colors.redAccent]),
filledFieldBorderGradient: LinearGradient(colors: [Colors.green, Colors.tealAccent]),
defaultFieldBorderGradient: LinearGradient(colors: [Colors.orange, Colors.brown]),
),
maxLength: 4,

/// no of pin field
showCursor: true,

/// bool to show cursor in pin field or not
cursorColor: Colors.indigo,

/// to choose cursor color
upperChild: Column(
children: [
SizedBox(height: 30),
Icon(Icons.flutter_dash_outlined, size: 150),
SizedBox(height: 20),
],
),
middleChild: Column(
children: [
SizedBox(height: 30),
ElevatedButton(
onPressed: () {
_otpPinFieldController.currentState
?.clearOtp(); // clear controller
},
child: Text('clear OTP')),
SizedBox(height: 10),
ElevatedButton(
onPressed: () => Navigator.push(context,
MaterialPageRoute(builder: (context) => NextPage())),
child: Text('Next Class')),
SizedBox(height: 30),
],
),

///bool which manage to show custom keyboard
showCustomKeyboard: true,

/// Widget which help you to show your own custom keyboard in place if default custom keyboard
// customKeyboard: Container(),
///bool which manage to show default OS keyboard
// showDefaultKeyboard: true,

/// to select cursor width
cursorWidth: 3,

/// place otp pin field according to yourself
mainAxisAlignment: MainAxisAlignment.center,

/// predefine decorate of pinField use OtpPinFieldDecoration.defaultPinBoxDecoration||OtpPinFieldDecoration.underlinedPinBoxDecoration||OtpPinFieldDecoration.roundedPinBoxDecoration
///use OtpPinFieldDecoration.custom (by using this you can make Otp_Pin_Field according to yourself like you can give fieldBorderRadius,fieldBorderWidth and etc things)
otpPinFieldDecoration:
OtpPinFieldDecoration.defaultPinBoxDecoration,
),

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Android SMS constraint #
For the code to be receive, it need to follow some rules as describe
here: https://developers.google.com/identity/sms-retriever/verify

Be no longer than 140 bytes
Contain a one-time code that the client sends back to your server to complete the verification
flow
End with an 11-character hash string that identifies your app

One example of SMS would be:
8125 is you verification code Ov114rXIhwf ( Ov114rXIhwf is your hash value which you will get in log ``` search your hash value is`` and append that value in your sms)
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refer to example/lib/main.dart
Different Shapes

video #

More information #
Pub package
Flutter documentation.