How to Dynamically Resize Text in Flutter

How to Dynamically Resize Text in Flutter

19 December 2024 Stephan Petzl Leave a comment Tech-Help

When working with Flutter, a common challenge developers face is adjusting text dynamically to fit within a designated space. This is particularly important when text is retrieved from a source like an API, where the content size can vary. In this article, we will explore effective methods to achieve dynamic text resizing in Flutter, ensuring that your app maintains a clean and professional appearance regardless of the text length.

Using FittedBox for Dynamic Text Resizing

One of the most efficient ways to dynamically resize text in Flutter is by using the FittedBox widget. This widget scales and positions its child within itself according to the specified BoxFit property. Here’s a simple example of how to implement FittedBox:

AppBar(
    centerTitle: true,
    title: FittedBox(
        fit: BoxFit.fitWidth, 
        child: Text('Hey this is my long text appbar title')
    ),
),
  

Wrapping your Text widget with FittedBox ensures that the text scales to fit the available width, making it a versatile choice for dynamic text handling.

Advanced Techniques with AutoSizeText

For more control over text resizing, consider using the auto_size_text package. This package allows you to specify maximum font sizes and even limit the number of lines. Here’s how you can implement it:

Container(
  child: ConstrainedBox(
    constraints: BoxConstraints(
      minWidth: 300.0,
      maxWidth: 300.0,
      minHeight: 30.0,
      maxHeight: 100.0,
    ),
    child: AutoSizeText(
      "yourText",
      style: TextStyle(fontSize: 30.0),
    ),
  ),
);
  

By integrating AutoSizeText, you gain granular control over text presentation, allowing for a polished and adaptable UI.

Practical Considerations and Best Practices

  • Use FittedBox for Simple Resizing: Ideal for scenarios where you want quick and efficient text resizing without additional dependencies.
  • Utilize AutoSizeText for Complex Layouts: Perfect for applications requiring precise control over text appearance, such as multi-line constraints and predefined font sizes.
  • Testing Across Devices: Always test your text scaling solutions across multiple devices to ensure consistency and readability.

Enhancing Your App with Repeato

As you work on optimizing your Flutter app’s UI, consider integrating automated testing to maintain quality across updates. Repeato, a no-code test automation tool for Flutter mobile apps, offers a seamless way to create, run, and maintain tests. With its computer vision and AI-driven approach, Repeato ensures your app’s text dynamically resizes correctly across all scenarios, enhancing speed and reliability in your development process.

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