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.MouseDownEventType.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); } }
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