读取文件时出现文件路径错误

Question

我正在为Android和Android制作游戏iOS并使用此脚本截取屏幕截图，并在达到高分时将其应用于精灵图像。调用getScreenshot()进行初始化。它在使用Application.persistentDataPath + "/" + screenshotFilename;的Windows上的播放器中工作正常，但我猜测iOS可能需要\，但我仍然在Xcode中收到函数LoadPNG();

的NullReferenceException

public static string screenshotFilename = "MM_Screenshot.png";
string pathToImage;

public void getScreenshot() {
    pathToImage = Application.persistentDataPath + "\\" + screenshotFilename;
    Application.CaptureScreenshot (pathToImage);
    StartCoroutine("LoadScreenshot");
}

IEnumerator LoadScreenshot() {
    Sprite NewSprite = new Sprite();
    Texture2D SpriteTexture = LoadPNG(pathToImage);
    GameObject.Find("CaptureImage").GetComponent<Image>().sprite = Sprite.Create(SpriteTexture,new Rect(0, 0, SpriteTexture.width, SpriteTexture.height), new Vector2(0.5f, 0.8f));
    yield return null;
}

public static Texture2D LoadPNG(string filePath) {

    Texture2D tex = null;
    byte[] fileData;

    if (File.Exists(filePath))     {
        fileData = File.ReadAllBytes(filePath);
        tex = new Texture2D(2, 2);
        tex.LoadImage(fileData); //..this will auto-resize the texture dimensions.
    }
    return tex;
}