A step-by-step walkthrough of building a custom slide toggle control in Unity's UI Toolkit. Covers inheriting from BaseField<bool>, exposing UXML attributes for UI Builder, structuring the control with BEM-named USS classes, handling click events to flip state, overriding SetValueWithoutNotify to keep visuals in sync, and styling with USS transitions for the sliding animation. Also shows how to query and use the custom control at runtime from a C# MonoBehaviour.
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