UXML element RadioButton

A RadioButton lets users select a single choice when used along with other RadioButtons in a group. You can use a GroupBox to group RadioButtons. Otherwise, the panel acts as the default group.

Note: To align an element with other fields in an InspectorA Unity window that displays information about the currently selected GameObject, asset or project settings, allowing you to inspect and edit the values. More info
See in Glossary window, simply apply the .unity-base-field__aligned USS class to it. For more information, refer to BaseField.

Create a RadioButton

You can create a RadioButton with UI(User Interface) Allows a user to interact with your application. Unity currently supports three UI systems. More info
See in Glossary Builder, UXML, or C#. The following C# example creates two new radio buttons in the same container and logically groups them together in the panel.

var choice1 = new RadioButton() { text = "Choice 1" };
choice1.RegisterValueChangedCallback(v => Debug.Log("Choice 1 is : " + v.newValue));
var choice2 = new RadioButton() { text = "Choice 2" };
choice2.RegisterValueChangedCallback(v => Debug.Log("Choice 2 is : " + v.newValue));
container.Add(choice1);
container.Add(choice2);

Examples

The following UXML example creates a RadioButton:

<UXML xmlns="UnityEngine.UIElements" xmlns:uie="UnityEditor.UIElements">
    <GroupBox>
        <RadioButton label="UXML Field 1" name="the-uxml-field1" />
        <RadioButton label="UXML Field 2" name="the-uxml-field2" />
    </GroupBox>
</UXML>

The following C# example illustrates some of the customizable functionalities of the RadioButton:

/// <sample>
// Note: See also RadioButtonGroup in the ChoiceField section of UI Toolkit Samples

// Get a reference to the first radio button from UXML and assign a value to it.
var uxmlField1 = container.Q<RadioButton>("the-uxml-field1");
var uxmlField2 = container.Q<RadioButton>("the-uxml-field2");
uxmlField1.value = true;

// Create two RadioButtons in a separate group, disable them, and give them a style class.
var groupBox = new GroupBox();
container.Add(groupBox);

var csharpField1 = new RadioButton("C# Field 1");
csharpField1.SetEnabled(false);
csharpField1.AddToClassList("some-styled-field");
groupBox.Add(csharpField1);

var csharpField2 = new RadioButton("C# Field 2");
csharpField2.SetEnabled(false);
csharpField2.AddToClassList("some-styled-field");
groupBox.Add(csharpField2);

csharpField1.value = uxmlField1.value;

// Mirror the value of the UXML field into the C# field.
uxmlField1.RegisterCallback<ChangeEvent<bool>>((evt) =>
{
    csharpField1.value = evt.newValue;
});
uxmlField2.RegisterCallback<ChangeEvent<bool>>((evt) =>
{
    csharpField2.value = evt.newValue;
});
/// </sample>

To try this example live in Unity, go to Window > UI Toolkit > Samples.

C# class and namespace

C# class: RadioButton
Namespace: UnityEngine.UIElements
Base class: BaseBoolField

Inherited UXML attributes

This element inherits the following attributes from its base class:

This element also inherits the following attributes from VisualElement:

USS classes

The following table lists all the C# public property names and their related USS selector.

You can also use the Matching Selectors section in the Inspector or the UI Toolkit Debugger to see which USS selectors affect the components of the VisualElement at every level of its hierarchy.

Additional resources

• RadioButtonGroup
• GroupBox