How to Show/Hide Password on TextField Input in Flutter App
Introduction
Flutter is a popular framework used to develop cross-platform applications. When creating a login or registration form, it’s essential to have a secure way to input passwords. One way to achieve this is by showing or hiding the password on a TextField input. In this article, we will explore how to implement this feature in a Flutter app.
Understanding the Requirement
To show or hide the password on a TextField input, we need to use the `obscureText` property. This property takes a boolean value, where `true` hides the password and `false` shows it.
Implementing the Solution
We can implement this feature by creating a boolean variable to toggle the `obscureText` property. Here’s an example code snippet:
“`dart
bool _isPasswordVisible = false;
@override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: TextField(
obscureText: _isPasswordVisible,
decoration: InputDecoration(
suffixIcon: IconButton(
icon: Icon(
isPasswordVisible ? Icons.visibility : Icons.visibilityoff,
),
onPressed: () {
setState(() {
isPasswordVisible = !isPasswordVisible;
});
},
),
),
),
),
);
}
“`
In this code, we create a boolean variable `_isPasswordVisible` to toggle the `obscureText` property. We use an `IconButton` as the suffix icon to toggle the visibility of the password.
Customizing the Solution
To further customize the solution, we can use a `TextInputType` of `password` to show a warning when the user tries to paste a password. We can also use a `validator` to check if the password is valid.
“`dart
TextField(
keyboardType: TextInputType.visiblePassword,
obscureText: _isPasswordVisible,
decoration: InputDecoration(
suffixIcon: IconButton(
icon: Icon(
isPasswordVisible ? Icons.visibility : Icons.visibilityoff,
),
onPressed: () {
setState(() {
isPasswordVisible = !isPasswordVisible;
});
},
),
),
validator: (value) {
if (value.length < 8) {
return ‘Password must be at least 8 characters long’;
}
return null;
},
)
“`
Conclusion
In this article, we explored how to show or hide the password on a TextField input in a Flutter app. We used the `obscureText` property to achieve this feature and provided a customizable solution to fit different use cases.
Frequently Asked Questions
1. What is the purpose of the `obscureText` property in Flutter?
The `obscureText` property is used to hide or show the text in a TextField input.
2. How do I toggle the `obscureText` property in Flutter?
You can toggle the `obscureText` property by creating a boolean variable and using the `setState` method to update the value.
3. Can I use a custom icon to toggle the password visibility?
Yes, you can use a custom icon to toggle the password visibility by using the `suffixIcon` property of the `InputDecoration` class.
4. How do I validate the password in a TextField input?
You can validate the password by using the `validator` property of the `TextField` class.
5. Can I use the `TextInputType` of `password` to show a warning when the user tries to paste a password?
Yes, you can use the `TextInputType` of `password` to show a warning when the user tries to paste a password.
