UnityEventT2

UnityEventT2 is a generic event system introduced in Unity’s scripting API to provide a more flexible and type-safe alternative to the traditional UnityEvent class. Unlike the standard UnityEvent, which uses a non-generic approach with object-based parameters, UnityEventT2 is designed to work with strongly-typed data, reducing the risk of runtime errors related to incorrect parameter types.

This event system is particularly useful in scenarios where developers need to pass specific data types between objects without relying on casting or type checking. UnityEventT2 is defined in the UnityEngine.Events namespace and is part of the Unity Events package, which also includes other event-related utilities. It supports multiple delegates, allowing multiple listeners to subscribe to the same event and receive updates when the event is invoked.

The class is generic, meaning it requires a type parameter when instantiated, such as UnityEventT2<int> for integer-based events or UnityEventT2<string> for string-based events. This type parameter ensures that only compatible methods can be added as listeners, improving code reliability. The API provides methods like AddListener, RemoveListener, and Invoke, similar to UnityEvent, but with stricter type enforcement.

UnityEventT2 is commonly used in game development for handling custom data-driven events, such as player score updates, UI interactions, or game state changes. It integrates seamlessly with Unity’s event system and can be easily serialized, making it suitable for editor-based workflows. While UnityEventT2 offers greater type safety, it requires developers to explicitly define the event type, which may introduce slight complexity compared to the simpler UnityEvent approach.