UnityAction

描述

UnityEvent 使用的 zero 参数委托。

使用此参数可在脚本中创建一些动态功能。Unity Action 支持您动态调用多个函数。由于 Unity Action 没有任何参数，它们调用的函数也不得包含任何参数。请参阅委托以了解更多信息。

//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");
    }
}