Flutter Login UI: A Simple Guide to Creating a User-Friendly Login Screen

Now for the fun part—let’s create the login UI using Flutter! Here’s a simple way to build it:

Step 1: Set Up Basic UI Components

To start, we’ll need a couple of key UI components:

• TextField: This widget allows users to input their username and password.
  
• RaisedButton (or ElevatedButton): This widget will be used for the login button.
  
• Padding and Alignment: These will help arrange our UI elements neatly.
  

Here’s an example of a simple login form layout:

dart

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import ‘package:flutter/material.dart’;

void main() {

  runApp(MyApp());

}

class MyApp extends StatelessWidget {

  @override

  Widget build(BuildContext context) {

    return MaterialApp(

      home: LoginScreen(),

    );

  }

}

class LoginScreen extends StatefulWidget {

  @override

  _LoginScreenState createState() => _LoginScreenState();

}

class _LoginScreenState extends State<LoginScreen> {

  final _usernameController = TextEditingController();

  final _passwordController = TextEditingController();

  @override

  Widget build(BuildContext context) {

    return Scaffold(

      appBar: AppBar(

        title: Text(“Login UI”),

      ),

      body: Padding(

        padding: const EdgeInsets.all(16.0),

        child: Column(

          children: [

            TextField(

              controller: _usernameController,

              decoration: InputDecoration(labelText: ‘Username’),

            ),

            TextField(

              controller: _passwordController,

              obscureText: true,

              decoration: InputDecoration(labelText: ‘Password’),

            ),

            SizedBox(height: 20),

            ElevatedButton(

              onPressed: () {

                // Handle login logic

              },

              child: Text(“Login”),

            ),

          ],

        ),

      ),

    );

  }

}

Step 2: Add Validation

No login form is complete without validation. To ensure that the user has entered valid data, we can add simple checks to verify if the username and password fields are filled in before they can proceed.

Here’s how you can add basic validation:

dart

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void _validateLogin() {

  String username = _usernameController.text;

  String password = _passwordController.text;

  if (username.isEmpty || password.isEmpty) {

    // Show an error message

    ScaffoldMessenger.of(context).showSnackBar(

      SnackBar(content: Text(“Please enter both username and password”)),

    );

  } else {

    // Proceed with login

    print(“Logging in…”);

  }

}

You can then call _validateLogin() when the login button is pressed.

Step 3: Style Your UI

To make your login UI look appealing, you can add padding, adjust the text input styles, and tweak button appearance. Here’s an example of improving the look:

dart

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TextField(

  controller: _usernameController,

  decoration: InputDecoration(

    labelText: ‘Username’,

    border: OutlineInputBorder(),

    prefixIcon: Icon(Icons.person),

  ),

),

This will add a border around the text field and a person icon for a better user experience.

Step 4: Add Backend Integration (Optional)

If you want to take your login UI further, you can connect it to a backend server or database using APIs. This will allow you to authenticate users with real credentials. For now, we’re focusing on the front-end UI, but integrating it with a backend is easy to achieve once you’re familiar with the basics.