Unity開發過程中如何正確的拿到Screen的width和height

首先明確兩個概念:

Screen.currentResolution - 指的是設備分辨率，比如:電腦上指的就是電腦的屏幕分辨率，手機上指的就是手機的屏幕分辨率。

Screen.width,Screen.height - 指的是使用該值的窗口的寬高，比如:在Scene窗口使用指的就是Scene窗口的寬高，在Game窗口使用，即運行編輯器時使用，指的就是Game窗口的寬高，在自定義的Window使用指的就是自定義的Window的寬高。

定義如下窗口，用來測試上述結論:

代碼:

using UnityEngine;
using UnityEditor;


public class CustomWindow : EditorWindow
{
    static CustomWindow mWin;

    [MenuItem("自定義窗口/MyWin")]
    static void ShowWin()
    {
        mWin = GetWindow<CustomWindow>();
        mWin.titleContent = new GUIContent("MyWin");
        mWin.minSize = new Vector2(400, 200);
    }

    void OnGUI()
    {
        if (GUILayout.Button("ShowInfo", GUILayout.Width(200), GUILayout.Height(50)))
        {
            Debug.Log("Screen.width = " + Screen.width + "  Screen.height = " + Screen.height + " | currentResolution = " + Screen.currentResolution);
        }
    }
}

打印結果:

在游戲開發過程中，我們更多關注的是Game視圖下的屏幕寬高。假如，我們想在自定的Window中獲取Game視圖的屏幕寬高，該如何做呢？

下面是NGUI-3.9.4中提供的獲取Game視圖屏幕寬高的方法:

static int mSizeFrame = -1;
static System.Reflection.MethodInfo s_GetSizeOfMainGameView;
static Vector2 mGameSize = Vector2.one;

/// <summary>
/// Size of the game view cannot be retrieved from Screen.width and Screen.height when the game view is hidden.
/// </summary>

static public Vector2 screenSize
{
    get
    {
        int frame = Time.frameCount;

        if (mSizeFrame != frame || !Application.isPlaying)
        {
            mSizeFrame = frame;

            if (s_GetSizeOfMainGameView == null)
            {
                System.Type type = System.Type.GetType("UnityEditor.GameView,UnityEditor");
                s_GetSizeOfMainGameView = type.GetMethod("GetSizeOfMainGameView",
                    System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Static);
            }
            mGameSize = (Vector2)s_GetSizeOfMainGameView.Invoke(null, null);
        }
        return mGameSize;
    }
}

對於移動設備，個人理解Screen.width,Screen.height和Screen.currentResolution值是一樣的(並未實際驗證)。為了安全起見，個人建議，編輯器下和移動設備上最好用Screen.width,Screen.height統一起來。NGUI也是這個思路:

#if UNITY_EDITOR
static int mSizeFrame = -1;
static System.Reflection.MethodInfo s_GetSizeOfMainGameView;
static Vector2 mGameSize = Vector2.one;

/// <summary>
/// Size of the game view cannot be retrieved from Screen.width and Screen.height when the game view is hidden.
/// </summary>

static public Vector2 screenSize
{
    get
    {
        int frame = Time.frameCount;

        if (mSizeFrame != frame || !Application.isPlaying)
        {
            mSizeFrame = frame;

            if (s_GetSizeOfMainGameView == null)
            {
                System.Type type = System.Type.GetType("UnityEditor.GameView,UnityEditor");
                s_GetSizeOfMainGameView = type.GetMethod("GetSizeOfMainGameView",
                    System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Static);
            }
            mGameSize = (Vector2)s_GetSizeOfMainGameView.Invoke(null, null);
        }
        return mGameSize;
    }
}
#else
    /// <summary>
    /// Size of the game view cannot be retrieved from Screen.width and Screen.height when the game view is hidden.
    /// </summary>

    static public Vector2 screenSize { get { return new Vector2(Screen.width, Screen.height); } }
#endif

 

這里再提供一個折疊屏手機展開或者閉合后屏幕適配的一個思路:

Update中檢測Screen的size是否發生變化，如果發生變化就去刷新一下錨定設置。

代碼:

using UnityEngine;

public class CheckScreen : MonoBehaviour
{
    int screenWidth, screenHeight;
    void Start()
    {
        screenWidth = Screen.width;
        screenHeight = Screen.height;
    }


    void Update()
    {
        if (screenWidth != Screen.width || screenHeight != Screen.height)
        {
            screenWidth = Screen.width;
            screenHeight = Screen.height;
            OnScreenChange();
        }
    }

    void OnScreenChange()
    {
        //發送消息-處理適配之 前 的一些操作
        //UI適配
        //3D適配
        //其他...
        //發送消息-處理適配之 后 的一些操作
    }
}