Event.alt

描述

是否按住 Alt/Option 键？（只读）

在 Windows 系统上，当任何 Alt 键被按住时，它将返回 true。
在 Mac 系统上，当任何 Option 键被按住时，它将返回 true。

using UnityEngine;

public class Example : MonoBehaviour
{
    // Prints Option or Alt key was pressed depending the
    // platform this script is being run.
    void OnGUI()
    {
        Event e = Event.current;
        if (e.alt)
        {
            if (Application.platform == RuntimePlatform.OSXEditor)
            {
                Debug.Log("Option key was pressed");
            }
            else if (Application.platform == RuntimePlatform.WindowsEditor)
            {
                Debug.Log("Alt Key was pressed!");
            }
        }
    }
}