How To Prevent RichText Styling Issues In Flutter

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Learn how to prevent RichText styling issues in Flutter apps and consider using the alternative Text.rich

Flutter provides developers with a versatile set of widgets for creating rich and engaging user interfaces. Two commonly used widgets for displaying styled text are RichText and Text.rich. While both widgets offer text styling capabilities, it’s essential to understand their differences, especially the fact that RichText does not use the default text theme. Learn how to prevent RichText styling issues in Flutter to not get headaches like did.

RichText Widget

The RichText widget in Flutter is designed to display a paragraph of mixed-style text. It allows you to apply different text styles to different parts of the text within a single widget. This makes it an excellent choice for situations where you need to format text in various ways within the same text block.

One important distinction to note is that RichText does not inherit the default text theme of your app. This means that if you want to apply a specific text style to your RichText, you need to explicitly define it for each TextSpan within the widget. While this may require a bit more work compared to using Text with the default text theme, it grants you full control over the styling of individual text spans.

Here’s a simple example of how to use RichText:

Dart
RichText(
  text: TextSpan(
    text: 'This is an example of ',
    style: TextStyle(color: Colors.black),
    children: <TextSpan>[
      TextSpan(
        text: 'richly styled text',
        style: TextStyle(
          fontWeight: FontWeight.bold,
          color: Colors.blue,
        ),
      ),
      TextSpan(
        text: ' in Flutter.',
        style: TextStyle(
          fontStyle: FontStyle.italic,
        ),
      ),
    ],
  ),
)

In this example, we have three different text spans with varying styles, all displayed within the same RichText widget.

Text.rich Widget

The Text.rich widget is an alternative to RichText that simplifies text styling by making use of the default text theme. Unlike RichText, Text.rich inherits the text style of your app’s theme, making it a convenient choice for maintaining consistency in your app’s design.

Here’s how you can use Text.rich:

Dart
Text.rich(
  TextSpan(
    text: 'This is an example of richly styled text in Flutter.',
    children: <TextSpan>[
      TextSpan(
        text: ' You can apply different styles easily.',
        style: TextStyle(
          fontWeight: FontWeight.bold,
          color: Colors.blue,
        ),
      ),
    ],
  ),
)

In this example, the Text.rich widget automatically uses the default text theme’s style, but you can still override it for specific text spans as needed.

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Comparison

Here is the output of the code examples from above.

Flutter RichText vs Text.rich output with styling. RichText does not use the default text theme font while Text.rich does.
Flutter RichText vs Text.rich output with styling. RichText does not use the default text theme font while Text.rich does.

As you can see, they use different fonts. Since we didn’t specify the fonts in the widget, I would assume that the default text theme font is applied. But this is not the case for RichText. My advice is to only use Text.rich to prevent this problem.

I didn’t spot other properties than the font so far, but maybe there are more to be aware of. With Text.rich you should be on the safer side.

Conclusion

In this article, you learned how to prevent RichText styling issues in Flutter to not get headaches like I did.

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