Скачать или смотреть Creating a Custom TextFormField in Flutter with an Optional Suffix Icon

Learn how to build a *Custom TextFormField* in Flutter that includes an optional *suffix icon* for enhanced functionality and user interface.
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This video is based on the question https://stackoverflow.com/q/70916084/ asked by the user 'caeruleum' ( https://stackoverflow.com/u/11812455/ ) and on the answer https://stackoverflow.com/a/70916297/ provided by the user 'Md. Yeasin Sheikh' ( https://stackoverflow.com/u/10157127/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Creating a Custom TextFormField in Flutter with an Optional Suffix Icon

When developing applications with Flutter, customizing input fields to suit the needs of your users is essential. One common requirement is having a TextFormField that includes an optional suffix icon. This can improve user experience by providing actions such as clearing the text or revealing a password. In this post, we'll explore how to implement a Custom TextFormField that accommodates an optional suffix icon in Flutter.

Understanding the Problem

You might find yourself in a situation where you want a TextFormField capable of displaying an icon next to its input field, for instance, an icon that could help users interact with the text input. This is especially useful for actions like hiding/showing passwords or submitting forms. The challenge lies in ensuring that the suffix icon is truly optional; if users do not provide an icon, the field should still function correctly.

Step-by-Step Solution

Let's break down the solution into simple, organized steps.

Step 1: Define the Custom Widget

We start by defining a custom widget, CustomTextFormField, that accepts several parameters including text, hint text, a boolean for obscuring text, and an optional IconButton.

Here’s what the code looks like:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Handle the Icon Button Callback

It's important to provide a way for the icon button to perform actions when pressed. To achieve this, we can add a callback method that gets triggered when the icon button is pressed.

Here’s how you can modify the constructor:

[[See Video to Reveal this Text or Code Snippet]]

With this, you can now use the callback whenever the default IconButton is displayed.

Step 3: Complete the Suffix Icon Implementation

Lastly, in your TextFormField, set up the suffixIcon to either use the provided iconButton or fall back to a default IconButton that utilizes the callback.

[[See Video to Reveal this Text or Code Snippet]]

With this setup, you can effortlessly create a customizable CustomTextFormField that allows you to maintain flexibility for the suffix icon.

Conclusion

Creating a Custom TextFormField with an optional suffix icon is an excellent way to enhance user interaction in your Flutter applications. By following the structured implementation provided, you can ensure users have a smooth and user-friendly experience while inputting data.

Feel free to adapt it further based on your specific requirements, like changing the default icon or adding more functionality to the callback. Happy coding!