How to show/hide password in TextFormField?

Question

Currently I have my password TextFormField like this:

TextFormField(
  decoration: const InputDecoration(
         


        

Answer 1

With a credit goes to X-Wei, you can create the widget as a separate password.dart:

import 'package:flutter/material.dart';

class PasswordField extends StatefulWidget {
  const PasswordField({
    this.fieldKey,
    this.hintText,
    this.labelText,
    this.helperText,
    this.onSaved,
    this.validator,
    this.onFieldSubmitted,
  });

  final Key fieldKey;
  final String hintText;
  final String labelText;
  final String helperText;
  final FormFieldSetter onSaved;
  final FormFieldValidator validator;
  final ValueChanged onFieldSubmitted;

  @override
  _PasswordFieldState createState() => new _PasswordFieldState();
}

class _PasswordFieldState extends State {
  bool _obscureText = true;

  @override
  Widget build(BuildContext context) {
    return new TextFormField(
      key: widget.fieldKey,
      obscureText: _obscureText,
      maxLength: 8,
      onSaved: widget.onSaved,
      validator: widget.validator,
      onFieldSubmitted: widget.onFieldSubmitted,
      decoration: new InputDecoration(
        border: const UnderlineInputBorder(),
        filled: true,
        hintText: widget.hintText,
        labelText: widget.labelText,
        helperText: widget.helperText,
        suffixIcon: new GestureDetector(
          onTap: () {
            setState(() {
              _obscureText = !_obscureText;
            });
          },
          child:
          new Icon(_obscureText ? Icons.visibility : Icons.visibility_off),
        ),
      ),
    );
  }
}

Call it as:

  import 'package:my_app/password.dart';

  String _password;
  final _passwordFieldKey = GlobalKey>();

  PasswordField(
    fieldKey: _passwordFieldKey,
    helperText: 'No more than 8 characters.',
    labelText: 'Password *',
    onFieldSubmitted: (String value) {
      setState(() {
        this._password = value;
      });
    },
  ),