using System;
using System.Collections;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using UnityEngine;
public class WindowMaxAndMin : MonoBehaviour {
[DllImport("user32.dll")]
    public static extern bool ShowWindow(IntPtr hwnd, int nCmdShow);
 
    [DllImport("user32.dll")]
    static extern IntPtr GetForegroundWindow();
 
    const int SW_SHOWMINIMIZED = 2; //{最小化, 激活}
    const int SW_SHOWMAXIMIZED = 3;//最大化
    const int SW_SHOWRESTORE = 1;//还原
    public void OnClickMinimize()
    { //最小化 
        ShowWindow(GetForegroundWindow(), SW_SHOWMINIMIZED);
    }
 
    public void OnClickMaximize()
    {
        //最大化
        ShowWindow(GetForegroundWindow(), SW_SHOWMAXIMIZED);
    }
 
    public void OnClickRestore()
    {
        //还原
        ShowWindow(GetForegroundWindow(), SW_SHOWRESTORE);
    }
 
    //测试
    public void OnGUI()
    {
        if(GUI.Button(new Rect(100,100,200,100),"最大化"))
            OnClickMaximize();
        if (GUI.Button(new Rect(100, 300, 200, 100), "最小化"))
            OnClickMinimize();
        if (GUI.Button(new Rect(100, 500, 200, 100), "窗口还原"))
            OnClickRestore(); 
    }
}

好使