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Showing content from https://docs.unity3d.com/Manual/../ScriptReference/Events.UnityEvent.html below:

Unity - Scripting API: UnityEvent

UnityEvent

class in UnityEngine.Events

Inherits from:Events.UnityEventBase

Implemented in:UnityEngine.CoreModule

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Description

A zero-argument event callback that persists with the Scene and allows the registration of runtime and persistent listeners.

You can use this class to add runtime listeners or define persistent listeners in the Unity Editor. You can also use this class to manage callbacks for game events or UI interactions. This is particularly useful for game components to communicate without tight coupling. UnityEvent can also be awaited in any async method.

using UnityEngine;
using UnityEngine.Events;public class ExampleClass : MonoBehaviour
{
    UnityEvent m_MyEvent;
    void Start()
    {
        if (m_MyEvent == null)
            m_MyEvent = new UnityEvent();
        m_MyEvent.AddListener(OnEventTriggered);
    }
    void Update()
    {
        if (Input.anyKeyDown && m_MyEvent != null)
        {
            m_MyEvent.Invoke();
        }
    }
    void OnEventTriggered()
    {
        Debug.Log("Callback executed");
    }
}

Constructors Constructor Description UnityEvent Initializes a new instance of the UnityEvent class. Public Methods Method Description AddListener Adds a runtime listener to the UnityEvent. Invoke Invoke all registered callbacks both runtime and persistent. RemoveListener Removes a runtime listener from the UnityEvent. Inherited Members Static Methods Method Description GetValidMethodInfo Given an object, function name, and a list of argument types; find the method that matches.

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