Explain how to manage form state in a complex Flutter application with multiple input fields.

Handling state using setState and callbacks
Storing state in a global singleton class
Using the Form widget and GlobalKey
Utilizing state management solutions like Provider or Riverpod

In a complex Flutter application with multiple input fields, managing form state is crucial. The recommended approach is to use the Form widget along with a GlobalKey. This allows you to validate and save form data easily. The FormState provides methods to interact with the form's state, such as validate() and save(). This structured approach enhances code organization and makes it easier to handle form-related operations.

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