How can I configure auto-capitalization behavior in Flutter's text entry fields?

Flutter has a textCapitalization property for textfields. Set this property to TextCapitalization.sentences or any of the available values eg .characters or .words Like so:

TextField(
   keyboardType: TextInputType.text,
   **textCapitalization: TextCapitalization.sentences,**
   style: TextStyle(
      fontSize: 30.0,
      color: Colors.black,
      fontWeight: FontWeight.bold
   ),
)

Here is the complete list of behaviors of TextInputAction class

textCapitalization: TextField provides options for capitalizing the text entered by the user.

1. TextCapitalization.sentences: This is the most common type of capitalization, and the first letter of each sentence is converted to uppercase.

   TextField(
    textCapitalization: TextCapitalization.sentences,
   ),
   

2. TextCapitalization.characters: Capitalize all characters in the sentence.

   TextField(
    textCapitalization: TextCapitalization.characters,
   ),
   

3. TextCapitalization.words: Capitalize the first letter of each word.

   TextField(
    textCapitalization: TextCapitalization.words,
   ),
   

4. Enable or disable autocorrection for a specific TextField. Use the AutoCorrect field to set it up. This also disables input suggestions.

   TextField(
 
     autocorrect: false,
   ),

   

Note: Only supports text keyboards, other keyboard types will ignore this configuration. Capitalization is locale-aware.

The starting-lowercase was a bug in our iOS implementation of Flutter's keyboard wrapper, which has since been fixed as of today!

I filed a bug for making this configurable (so you can disable the autocapitalize sentences behavior) here: https://github.com/flutter/flutter/issues/9363

Please don't hesitate to reach out if this does not resolve your issue.