Legacy Documentation: Version 2017.1 (Go to current version)
LanguageEnglish
  • C#
  • JS

Script language

Select your preferred scripting language. All code snippets will be displayed in this language.

UnityAction

Suggest a change

Success!

Thank you for helping us improve the quality of Unity Documentation. Although we cannot accept all submissions, we do read each suggested change from our users and will make updates where applicable.

Close

Submission failed

For some reason your suggested change could not be submitted. Please <a>try again</a> in a few minutes. And thank you for taking the time to help us improve the quality of Unity Documentation.

Close

Cancel

public delegate UnityAction(): void;
public delegate void UnityAction();

Description

Zero argument delegate used by UnityEvents.

Use this to create some dynamic functionality in your scripts. Unity Actions allow you to dynamically call multiple functions. Since Unity Actions have no arguments, functions they call must also have no arguments. See Delegates for more information.

no example available in JavaScript
//Attach this script to a GameObject. Attach a Renderer and Button component to the same GameObject for this example.
//This script will change the Color of the GameObject as well as output messages to the Console saying which function was run by the UnityAction.

using UnityEngine; using UnityEngine.UI; using UnityEngine.Events;

public class UnityActionExample : MonoBehaviour { //This is the Button you attach to the GameObject in the Inspector Button m_AddButton; Renderer m_Renderer;

private UnityAction m_MyFirstAction; //This is the number that the script updates float m_MyNumber;

void Start() { //Fetch the Button and Renderer components from the GameObject m_AddButton = GetComponent<Button>(); m_Renderer = GetComponent<Renderer>();

//Make a Unity Action that calls your function m_MyFirstAction += MyFunction; //Make the Unity Action also call your second function m_MyFirstAction += MySecondFunction; //Register the Button to detect clicks and call your Unity Action m_AddButton.onClick.AddListener(m_MyFirstAction); }

void MyFunction() { //Add to the number m_MyNumber++; //Display the number so far with the message Debug.Log("First Added : " + m_MyNumber); }

void MySecondFunction() { //Change the Color of the GameObject m_Renderer.material.color = Color.blue; //Ouput the message that the second function was played Debug.Log("Second Added"); } }

Did you find this page useful? Please give it a rating: