Button.onClick

描述

按下按钮时触发的 UnityEvent。

使用 UnityEvent.AddListener 可扩展 onClick 单击事件。释放按下的 Button 时会调用添加的 UnityAction。一个 Button 可以有多个监听器。例如，在下面的脚本示例中，btn3 可以添加 TaskOnClick 作为第二个监听器调用。

请注意需要在 onClick 之前调用 EventType.MouseDown 和 EventType.MouseUp。

// To use this example, attach this script to an empty GameObject.
// Create three buttons (Create>UI>Button). Next, select your
// empty GameObject in the Hierarchy and click and drag each of your
// Buttons from the Hierarchy to the Your First Button, Your Second Button
// and Your Third Button fields in the Inspector.
// Click each Button in Play Mode to output their message to the console.
// Note that click means press down and then release.

using UnityEngine;
using UnityEngine.UI;

public class Example : MonoBehaviour
{
    //Make sure to attach these Buttons in the Inspector
    public Button m_YourFirstButton, m_YourSecondButton, m_YourThirdButton;

    void Start()
    {
        //Calls the TaskOnClick/TaskWithParameters/ButtonClicked method when you click the Button
        m_YourFirstButton.onClick.AddListener(TaskOnClick);
        m_YourSecondButton.onClick.AddListener(delegate {TaskWithParameters("Hello"); });
        m_YourThirdButton.onClick.AddListener(() => ButtonClicked(42));
        m_YourThirdButton.onClick.AddListener(TaskOnClick);
    }

    void TaskOnClick()
    {
        //Output this to console when Button1 or Button3 is clicked
        Debug.Log("You have clicked the button!");
    }

    void TaskWithParameters(string message)
    {
        //Output this to console when the Button2 is clicked
        Debug.Log(message);
    }

    void ButtonClicked(int buttonNo)
    {
        //Output this to console when the Button3 is clicked
        Debug.Log("Button clicked = " + buttonNo);
    }
}