Introduction to Flutter's Pin Code Fields Package

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Introduction to Flutter's Pin Code Fields Package

The pin_code_fields package provides a customizable and user-friendly widget for inputting PIN codes or OTPs in Flutter applications. This package offers a comprehensive set of features and options to enhance the user experience and seamlessly integrate with your app's design.

Features

The pin_code_fields package boasts a range of features that make it an ideal choice for PIN code input:

  • Automatic Focus Management: The package automatically focuses the next field on typing and moves the focus back to the previous field on deletion, ensuring a smooth and intuitive user experience.
  • Cursor Support: Unlike many other PIN code input widgets, pin_code_fields provides full support for cursor functionality, allowing users to easily navigate and edit their input.
  • Highly Customizable: The package offers extensive customization options that allow you to tailor the appearance and behavior of the PIN code fields to match your app's theme and requirements.
  • Multiple Animation Types: Pin code fields can be animated to appear using various animation types (scale, slide, fade, none), adding an extra touch of polish to your app.
  • Animated Active, Inactive, Selected, and Disabled Field Coloring: Each field's color can be dynamically changed based on its state (active, inactive, selected, disabled), providing visual feedback to the user.
  • Autofocus: The package supports autofocusing the first field, making it easy for users to start typing immediately.
  • OTP-Code Pasting: Users can easily paste OTP codes from the clipboard, reducing the need for manual input.
  • iOS Autofill Support: The package integrates seamlessly with iOS autofill, allowing users to quickly fill in OTP codes suggested by the system.
  • Error Animation: The package provides built-in support for shake animation to indicate input errors, providing visual cues to the user. It can be triggered programmatically.

Usage

Integrating the pin_code_fields package into your Flutter app is straightforward:

  1. Add the package to your project's pubspec.yaml file:
dependencies:
  pin_code_fields: ^6.1.0
  1. Import the package into your Dart file:
import 'package:pin_code_fields/pin_code_fields.dart';
  1. Create a PinCodeTextField widget and specify the desired properties:
PinCodeTextField(
  length: 6,
  obscureText: false,
  animationType: AnimationType.fade,
  pinTheme: PinTheme(
    shape: PinCodeFieldShape.box,
    borderRadius: BorderRadius.circular(5),
    fieldHeight: 50,
    fieldWidth: 40,
    activeFillColor: Colors.white,
  ),
  animationDuration: Duration(milliseconds: 300),
  backgroundColor: Colors.blue.shade50,
  enableActiveFill: true,
  errorAnimationController: errorController,
  controller: textEditingController,
  onCompleted: (v) {
    print("Completed");
  },
  onChanged: (value) {
    print(value);
    setState(() {
      currentText = value;
    });
  },
  beforeTextPaste: (text) {
    print("Allowing to paste $text");
    //if you return true then it will show the paste confirmation dialog. Otherwise if false, then nothing will happen.
    //but you can show anything you want here, like your pop up saying wrong paste format or etc
    return true;
  },
)

Customization

The pin_code_fields package allows you to customize various aspects of the PIN code fields:

  • Shape: Choose from box, underline, or circle shapes for the fields.
  • Animation: Specify the animation type (scale, slide, fade, none) for when the fields appear.
  • Colors: Set the colors for active, inactive, selected, and disabled fields.
  • Border: Control the border style, radius, and width.
  • TextStyle: Customize the font, size, weight, and color of the text in the fields.
  • Error Animation: Trigger the shake animation to indicate input errors.

Conclusion

The pin_code_fields package is a powerful and feature-rich solution for implementing PIN code input functionality in Flutter applications. With its extensive customization options, animations, and ease of use, it provides a seamless and user-friendly way to enhance your app's user experience. Whether you're building an OTP verification system or simply need to collect PIN codes, this package offers a robust and flexible solution to meet your requirements.

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