Flutter Screen Lock

Flutterappworld

3 years ago

Short Intro: Provides the ability to lock the screen on ios and android. Biometric authentication can be used in addition to passcode.

This Flutter plugin provides an feature for screen lock. Enter your passcode to unlock the screen. You can also use biometric authentication as an option.

Attention

A detailed API description will be provided later. Only tentatively necessary information is provided.

Features

By the length of the character count
You can change Cancel and Delete widget
Optimizes the UI for device size and orientation
You can disable cancellation
You can use biometrics (local_auth plugin)
Biometrics can be displayed on first launch
Unlocked callback
You can specify a mismatch event.
Limit the maximum number of retries

Usage

You can easily lock the screen with the following code.
To unlock, enter correctString.

Simple

If you give the same input as correctString, it will automatically close the screen.

import 'package:flutter_screen_lock/functions.dart';

screenLock(
  context: context,
  correctString: '1234',
);

Change digits

Provides a screen lock that cannot be canceled.

import 'package:flutter_screen_lock/functions.dart';

screenLock(
  context: context,
  correctString: '1234',
  canCancel: false,
);

Confirmation screen

You can display the confirmation screen and get the first input with didConfirmed if the first and second inputs match.

import 'package:flutter_screen_lock/functions.dart';

screenLock(
  context: context,
  correctString: '',
  confirmation: true,
  didConfirmed: (matchedText) {
    print(matchedText);
  },
);

Control the confirmation state

import 'package:flutter_screen_lock/functions.dart';
import 'package:flutter_screen_lock/input_controller.dart';

final inputController = InputController();

screenLock(
  context: context,
  correctString: '',
  confirmation: true,
  inputController: inputController,
);

// Release the confirmation state at any event.
inputController.unsetConfirmed();

Use local_auth

Add the local_auth package to pubspec.yml.

https://pub.dev/packages/local_auth

It includes an example that calls biometrics as soon as screenLock is displayed in didOpened.

import 'package:flutter_screen_lock/functions.dart';
import 'package:local_auth/local_auth.dart';
import 'package:flutter/material.dart';

/// Method extraction to call by initial display and custom buttons.
Future<void> localAuth(BuildContext context) async {
  final localAuth = LocalAuthentication();
  final didAuthenticate = await localAuth.authenticateWithBiometrics(
      localizedReason: 'Please authenticate');
  if (didAuthenticate) {
    Navigator.pop(context);
  }
}

screenLock(
  context: context,
  correctString: '1234',
  customizedButtonChild: Icon(
    Icons.fingerprint,
  ),
  customizedButtonTap: () async {
    await localAuth(context);
  },
  didOpened: () async {
    await localAuth(context);
  },
);

Full customize

import 'package:flutter/material.dart';
import 'package:flutter_screen_lock/configurations/input_button_config.dart';
import 'package:flutter_screen_lock/configurations/screen_lock_config.dart';
import 'package:flutter_screen_lock/configurations/secret_config.dart';
import 'package:flutter_screen_lock/configurations/secrets_config.dart';
import 'package:flutter_screen_lock/functions.dart';
import 'package:flutter_screen_lock/screen_lock.dart';

screenLock(
  context: context,
  title: Text('change title'),
  confirmTitle: Text('change confirm title'),
  correctString: '1234',
  confirmation: true,
  screenLockConfig: ScreenLockConfig(
    backgroundColor: Colors.deepOrange,
  ),
  secretsConfig: SecretsConfig(
    spacing: 15, // or spacingRatio
    padding: const EdgeInsets.all(40),
    secretConfig: SecretConfig(
      borderColor: Colors.amber,
      borderSize: 2.0,
      disabledColor: Colors.black,
      enabledColor: Colors.amber,
      height: 15,
      width: 15,
      build: (context, {config, enabled}) {
        return SizedBox(
          child: Container(
            decoration: BoxDecoration(
              shape: BoxShape.rectangle,
              color: enabled
                  ? config.enabledColor
                  : config.disabledColor,
              border: Border.all(
                width: config.borderSize,
                color: config.borderColor,
              ),
            ),
            padding: EdgeInsets.all(10),
            width: config.width,
            height: config.height,
          ),
          width: config.width,
          height: config.height,
        );
      },
    ),
  ),
  inputButtonConfig: InputButtonConfig(
    textStyle:
        InputButtonConfig.getDefaultTextStyle(context).copyWith(
      color: Colors.orange,
      fontWeight: FontWeight.bold,
    ),
    buttonStyle: OutlinedButton.styleFrom(
      shape: RoundedRectangleBorder(),
      backgroundColor: Colors.deepOrange,
    ),
  ),
  cancelButton: const Icon(Icons.close),
  deleteButton: const Icon(Icons.delete),
);

API References

screenLock / ScreenLock API

Property	Type	Default	Description
context	BuildContext		(Required) [screenLock] only
correctString	String		(Required) Input correct String If [confirmation] is `true`, it will be ignored, so set it to any string or empty.
screenLockConfig	ScreenLockConfig	ScreenLockConfig()	Refer to the API of ScreenLockConfig
secretsConfig	SecretsConfig	SecretsConfig()	Refer to the API of SecretsConfig
inputButtonConfig	InputButtonConfig	InputButtonConfig()	Refer to the API of InputButtonConfig
canCancel	bool	true	`true` is show cancel button. (Default: `true`)
confirmation	bool		Make sure the first and second inputs are the same.
digits	int		Set the maximum number of characters to enter when [confirmation] is `true`.
maxRetries	int	0	`0` is unlimited. For example, if it is set to 1, didMaxRetries will be called on the first failure.
didUnlocked	void Function()		Called if the value matches the correctString.
didError	void Function(int retries)		Called if the value does not match the correctString.
didMaxRetries	void Function(int retries)		Events that have reached the maximum number of attempts.
didOpened	void Function()		For example, when you want to perform biometric authentication. [screenLock] only
didConfirmed	void Function(String matchedText)		Called when the first and second inputs match during confirmation. It is possible to receive the matched text as an argument.
customizedButtonTap	Future<void> Function()		Tapped for left side lower button.
customizedButtonChild	Widget		Child for bottom left side button.
footer	Widget		Add a Widget to the footer.
cancelButton	Widget		Change the child widget for the cancel button.
deleteButton	Widget		Change the child widget for the delete button.
title	Widget	HeadingTitle(text: ‘Please enter passcode.’)	Change the title widget.
confirmTitle	Widget	HeadingTitle(text: ‘Please enter confirm passcode.’)	Change the confirm title widget.
inputController	InputController		Control the confirmation state change on the outside.

ScreenLockConfig API

Property	Type	Default	Description
backgroundColor	Color		Specifies the background color of the screen. By default, themeData will be set.
themeData	ThemeData	ScreenLockConfig.defaultThemeData

SecretsConfig API

Property	Type	Default	Description
spacing	double		Absolute space between secret widgets. If specified together with spacingRatio, this will take precedence.
spacingRatio	double	0.05	Space ratio between secret widgets.
padding	EdgeInsetsGeometry	EdgeInsets.only(top: 20, bottom: 50)	padding of Secrets Widget.
secretConfig	SecretConfig	SecretConfig()	Refer to the API of SecretConfig

SecretConfig API

Property	Type	Default	Description
width	double	16	Widget width.
height	double	16	Widget height.
borderSize	double	1.0	border size.
borderColor	Color	Color(0xFFFFFFFF)	border color.
enabledColor	Color	Color(0xFFFFFFFF)	Fill color when input is active.
disabledColor	Color	Color(0xFFFFFFFF)	Fill color for unentered.

InputButtonConfig API

Property	Type	Default	Description
height	double	`MediaQuery.of(context).size.height * 0.6 * 0.16`	Button height.
width	double	`MediaQuery.of(context).size.width * 0.22`	Button width.
autoSize	bool	true	Automatically adjust the size of the square to fit the orientation of the device.
inputStrings	List<String>	[‘0′,’1′,’2′,’3′,’4′,’5′,’6′,’7′,’8′,’9’]	A string to be matched against correctString.
displayStrings	List<String>	[‘0′,’1′,’2′,’3′,’4′,’5′,’6′,’7′,’8′,’9’]	The string to be displayed on the screen.
style	ButtonStyle		It is recommended that you use [OutlinedButton.styleFrom()] to change it.
textStyle	TextStyle		Changes the text style of the button.

Download Flutter Screen Lock package source code on GitHub

https://github.com/naoki0719/flutter_screen_lock