Unity 编辑器中获取GameView的分辨率

using UnityEngine;
using System.Collections;

public class GameCamera : MonoBehaviour
{
	private Camera _unityCamera;
	private Camera UnityCamera
	{
		get
		{
			if (_unityCamera == null)
			{
				_unityCamera = GetComponent<Camera>();
				if (_unityCamera == null)
				{
					Debug.LogError("A unity camera must be attached to the GameCamera script");
				}
			}
			return _unityCamera;
		}
	}

	public Camera ScreenCamera 
	{
		get
		{
			return UnityCamera;
		}
	}

	void Awake()
	{

	}

#if UNITY_EDITOR
	void Update()
	{	// 打印看看，是不是得到了编辑器的分辨率
		Debug.Log("[INFO] Resolusion: " + GetScreenPixelDimensions(this));
	}
#endif

	// 获得分辨率，当选择 Free Aspect 直接返回相机的像素宽和高
	Vector2 GetScreenPixelDimensions(GameCamera settings)
	{
		Vector2 dimensions = new Vector2(ScreenCamera.pixelWidth, ScreenCamera.pixelHeight);

#if UNITY_EDITOR
		// 获取编辑器 GameView 的分辨率
		float gameViewPixelWidth = 0, gameViewPixelHeight = 0;
		float gameViewAspect = 0;

		if (Editor__GetGameViewSize(out gameViewPixelWidth, out gameViewPixelHeight, out gameViewAspect))
		{
			if (gameViewPixelWidth != 0 && gameViewPixelHeight != 0)
			{
				dimensions.x = gameViewPixelWidth;
				dimensions.y = gameViewPixelHeight;
			}
		}
#endif

		return dimensions;
	}

#if UNITY_EDITOR
	static bool Editor__getGameViewSizeError = false;
	public static bool Editor__gameViewReflectionError = false;

	// 尝试获取 GameView 的分辨率
	// 当正确获取到 GameView 的分辨率时，返回 true
	public static bool Editor__GetGameViewSize(out float width, out float height, out float aspect)
	{
		try
		{
			Editor__gameViewReflectionError = false;

			System.Type gameViewType = System.Type.GetType("UnityEditor.GameView,UnityEditor");
			System.Reflection.MethodInfo GetMainGameView = gameViewType.GetMethod("GetMainGameView", System.Reflection.BindingFlags.Static | System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.NonPublic);
			object mainGameViewInst = GetMainGameView.Invoke(null, null);
			if (mainGameViewInst == null)
			{
				width = height = aspect = 0;
				return false;
			}
			System.Reflection.FieldInfo s_viewModeResolutions = gameViewType.GetField("s_viewModeResolutions", System.Reflection.BindingFlags.Static | System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.NonPublic);
			if (s_viewModeResolutions == null)
			{
				System.Reflection.PropertyInfo currentGameViewSize = gameViewType.GetProperty("currentGameViewSize", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.NonPublic);
				object gameViewSize = currentGameViewSize.GetValue(mainGameViewInst, null);
				System.Type gameViewSizeType = gameViewSize.GetType();
				int gvWidth = (int)gameViewSizeType.GetProperty("width").GetValue(gameViewSize, null);
				int gvHeight = (int)gameViewSizeType.GetProperty("height").GetValue(gameViewSize, null);
				int gvSizeType = (int)gameViewSizeType.GetProperty("sizeType").GetValue(gameViewSize, null);
				if (gvWidth == 0 || gvHeight == 0)
				{
					width = height = aspect = 0;
					return false;
				}
				else if (gvSizeType == 0)
				{
					width = height = 0;
					aspect = (float)gvWidth / (float)gvHeight;
					return true;
				}
				else
				{
					width = gvWidth; height = gvHeight;
					aspect = (float)gvWidth / (float)gvHeight;
					return true;
				}
			}
			else
			{
				Vector2[] viewModeResolutions = (Vector2[])s_viewModeResolutions.GetValue(null);
				float[] viewModeAspects = (float[])gameViewType.GetField("s_viewModeAspects", System.Reflection.BindingFlags.Static | System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.NonPublic).GetValue(null);
				string[] viewModeStrings = (string[])gameViewType.GetField("s_viewModeAspectStrings", System.Reflection.BindingFlags.Static | System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.NonPublic).GetValue(null);
				if (mainGameViewInst != null
					&& viewModeStrings != null
					&& viewModeResolutions != null && viewModeAspects != null)
				{
					int aspectRatio = (int)gameViewType.GetField("m_AspectRatio", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.NonPublic).GetValue(mainGameViewInst);
					string thisViewModeString = viewModeStrings[aspectRatio];
					if (thisViewModeString.Contains("Standalone"))
					{
						width = UnityEditor.PlayerSettings.defaultScreenWidth; height = UnityEditor.PlayerSettings.defaultScreenHeight;
						aspect = width / height;
					}
					else if (thisViewModeString.Contains("Web"))
					{
						width = UnityEditor.PlayerSettings.defaultWebScreenWidth; height = UnityEditor.PlayerSettings.defaultWebScreenHeight;
						aspect = width / height;
					}
					else
					{
						width = viewModeResolutions[aspectRatio].x; height = viewModeResolutions[aspectRatio].y;
						aspect = viewModeAspects[aspectRatio];
						// this is an error state
						if (width == 0 && height == 0 && aspect == 0)
						{
							return false;
						}
					}
					return true;
				}
			}
		}
		catch (System.Exception e)
		{
			if (Editor__getGameViewSizeError == false)
			{
				Debug.LogError("GameCamera.GetGameViewSize - has a Unity update broken this?
This is not a fatal error !
" + e.ToString());
				Editor__getGameViewSizeError = true;
			}
			Editor__gameViewReflectionError = true;
		}
		width = height = aspect = 0;
		return false;
	}
#endif
}