How to set Flutter Text line space?

In Flutter, adjusting line spacing (also known as line height) is a common task that can be achieved by setting the height parameter within the TextStyle property. The height property defines the space between text lines, with its value specified as a multiple of the font size.

For example, if you want to set a text widget with line spacing that is 1.5 times the font size, you can do the following:

dart
Text(
  'This is an example text demonstrating how to set line spacing.',
  style: TextStyle(
    fontSize: 20.0, // Specifies a font size of 20
    height: 1.5, // Specifies line height as 1.5 times the font size
  ),
)

Here, fontSize: 20.0 specifies a font size of 20, and height: 1.5 specifies line height as 1.5 times the font size. When height is set to 1.0, the line spacing is standard with no additional space. Increasing this value increases the spacing between lines, while decreasing it reduces the spacing.

Additionally, if you not only need to set line spacing globally but also want to adjust specific paragraphs or text segments, you can utilize the RichText widget with TextSpan, applying different TextStyle settings to various TextSpan instances.

dart
RichText(
  text: TextSpan(
    children: <TextSpan>[
      TextSpan(
        text: 'First line text\n',
        style: TextStyle(fontSize: 20.0, height: 1.0, color: Colors.black),
      ),
      TextSpan(
        text: 'Second line text\n',
        style: TextStyle(fontSize: 20.0, height: 2.0, color: Colors.black),
      ),
      TextSpan(
        text: 'Third line text',
        style: TextStyle(fontSize: 20.0, height: 1.5, color: Colors.black),
      ),
    ],
  ),
)

In this example, the first line has standard line spacing, the second line has double the line spacing, and the third line has 1.5 times the spacing. This approach allows you to more precisely control the line spacing for different text segments.

In summary, by adjusting the height property within TextStyle, you can flexibly adjust the line spacing in Flutter to achieve both aesthetic appeal and readability.