Unity 用UnityUI实现最小化

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System.Runtime.InteropServices;
using System;
/*xbb
 * 系统方法类
 * */
public class WindowsTools {

    //设置当前窗口的显示状态
    [DllImport("user32.dll")]
    public static extern bool ShowWindow(System.IntPtr hwnd, int nCmdShow);

    //获取当前激活窗口
    [DllImport("user32.dll", EntryPoint = "GetForegroundWindow")]
    public static extern System.IntPtr GetForegroundWindow();

    //设置窗口边框
    [DllImport("user32.dll")]
    public static extern IntPtr SetWindowLong(IntPtr hwnd, int _nIndex, int dwNewLong);

    //设置窗口位置，大小
    [DllImport("user32.dll")]
    public static extern bool SetWindowPos(IntPtr hWnd, int hWndInsertAfter, int X, int Y, int cx, int cy, uint uFlags);

    //窗口拖动
    [DllImport("user32.dll")]
    public static extern bool ReleaseCapture();
    [DllImport("user32.dll")]
    public static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);

    //边框参数
    const uint SWP_SHOWWINDOW = 0x0040;
    const int GWL_STYLE = -16;
    const int WS_BORDER = 1;
    const int WS_POPUP = 0x800000;
    const int SW_SHOWMINIMIZED = 2;//(最小化窗口)


    //最小化窗口
    public void SetMinWindows()
    {
        ShowWindow(GetForegroundWindow(), SW_SHOWMINIMIZED);
        //具体窗口参数看这     https://msdn.microsoft.com/en-us/library/windows/desktop/ms633548(v=vs.85).aspx
    }

    //设置无边框，并设置框体大小，位置
    public  void SetNoFrameWindow(Rect rect)
    {
        SetWindowLong(GetForegroundWindow(), GWL_STYLE, WS_POPUP);
        bool result = SetWindowPos(GetForegroundWindow(), 0, (int)rect.x, (int)rect.y, (int)rect.width, (int)rect.height, SWP_SHOWWINDOW);
    }

    //拖动窗口
    public void DragWindow(IntPtr window)
    {
        ReleaseCapture();
        SendMessage(window, 0xA1, 0x02, 0);
        SendMessage(window, 0x0202, 0, 0);
    }
}

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System;

/*xbb
* 
* */
public class WindowsToolMgr : Singleton<WindowsToolMgr>
{

  //系统方法类实体
  public WindowsTools winTool = new WindowsTools();

  //当前Unity程序进程
  private static IntPtr currentWindow;

  void Start()
  {
      currentWindow = WindowsTools.GetForegroundWindow();
  }

  //最小化窗口
  public void MinWindows()
  {
      winTool.SetMinWindows();

  }

  //设置无边框窗口
  public void SetNoFrame()
  {
      //窗口大小  以此为例
      float windowWidth = 1024;
      float windowHeight = 768;
      //计算框体显示位置
      float posX = (Screen.currentResolution.width - windowWidth) / 2;
      float posY = (Screen.currentResolution.height - windowHeight) / 2;
      Rect _rect = new Rect(posX, posY, windowWidth, windowHeight);

      winTool.SetNoFrameWindow(_rect);
  }

  /// <summary>
  /// 全屏
  /// </summary>
  public void FullScreen()
  {
      if (Screen.fullScreen)
      {
          Screen.SetResolution(1024, 768, false);
      }
      else
      {
          Screen.SetResolution(Screen.currentResolution.width, Screen.currentResolution.height, true);
      }
      //等待当前帧完成 再去除边框
      StartCoroutine(IE_NoFrame());
  }

  private IEnumerator IE_NoFrame()
  {
      yield return new WaitForEndOfFrame();
      yield return new WaitForFixedUpdate();
      if (!Screen.fullScreen)
      {
          SetNoFrame();
      }
  }

  //窗口拖动
  public void Drag()
  {
      winTool.DragWindow(currentWindow);
  }
}

在unity中添加一个Button调用WindowsToolMgr中的MinWindows方法

参考:https://www.jianshu.com/p/03310f18ef34