Brief Summary
This video introduces the Cupertino Radio widget in Flutter, designed for iOS-style selection of mutually exclusive options. It covers instantiation, value assignment, group management for maintaining selection state, and customization options for colors. The video also suggests pairing the widget with Cupertino List Tile for adding labels.
- Introduces the Cupertino Radio widget for iOS-style selection.
- Explains how to instantiate and assign values to radio buttons.
- Details group management for maintaining selection state.
- Covers customization options for colors and pairing with Cupertino List Tile for labels.
Introduction to Cupertino Radio
The video introduces the Cupertino Radio widget, which is designed to provide an iOS-style component for selecting one option from a set of mutually exclusive values. This widget is suitable for scenarios where users need to choose a single option from a list.
Instantiation and Value Assignment
To use the Cupertino Radio widget, you start by instantiating it. The button values are of a generic type, allowing you to use any type you prefer, with enums being a common choice for representing a fixed set of options. Each radio is assigned a specific value that it represents within the group.
Group Management and Selection State
The radio buttons do not maintain their own state individually. Instead, a group of radios shares a common group value that tracks which radio is currently selected. When a radio's value matches the group value, it appears selected, while all other radio buttons are deselected. An onChanged callback is provided to update the selected state variable when a radio button is clicked, ensuring that the UI reflects the current selection.
Customization Options
The Cupertino Radio widget offers several customization options. You can configure the active color, inactive color, and the inner circle fill color when the radio button is selected. For adding labels to the radio buttons, it is suggested to pair them with Cupertino List Tile, enhancing the user interface with clear and descriptive labels.
Conclusion
The Cupertino Radio widget is a suitable choice for iOS users needing to select between mutually exclusive values. For more information on the Cupertino Radio widget and other widgets, you can visit flutter.dev.
