Unity 获取Game窗口分辨率

方式1：调用api

直接调用：Handles.GetMainGameViewSize

方法2：反射

1. 下载Unity源代码Github
   查找GameView脚本:Editro/Mono/GameView/GameView.cs
   GameView脚本是内部类，继承PlayModeView,命名空间是UnityEditor
   PlayModeView继承EditorWindow
2. 查找Handles.cs脚本，Editor\Mono\Handles\Handles
   Handles.GetMainGameViewSize的静态方法内部调用PlayModeView的GetMainPlayModeViewTargetSize方法

实现

using UnityEditor;
using System.Reflection;
if (GUILayout.Button("获取GameView Size"))
{
    Type type = typeof(EditorWindow);//无法直接获取 UnityEditor.GameView的Type
    Assembly assembly = type.Assembly;//获取程序集
    type = assembly.GetType("UnityEditor.GameView");//获取gameview的类型
    var method = type.GetMethod("GetMainPlayModeViewTargetSize",//获取方法
        BindingFlags.Static | BindingFlags.NonPublic | BindingFlags.FlattenHierarchy);
    var gameWindow = EditorWindow.GetWindow(type);//获取窗口实例
    Vector2 size = (Vector2)method.Invoke(gameWindow, null);//调用方法
    Debug.Log(size);//打印大小
}