PlayerPrefsXが必須で、オブジェクトを保存できる（完璧ではないが） URL: http://wiki.unity3d.com/index.php/PlayerPrefsX2

PlayerPrefsX2.cs

/*
	PlayerPrefsX2
	Author: shinriyo 
	Date: 1/9/2015
 */
using UnityEngine;
using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
using System.Reflection;

public class PlayerPrefsX2 
{		
	public static T GetObject<T>(string key, T defaultValue) where T : new()
	{
		Type t = typeof(T);
		FieldInfo[] fieldInfos = t.GetFields(BindingFlags.Public | BindingFlags.NonPublic |
			BindingFlags.Instance | BindingFlags.Static |
			BindingFlags.DeclaredOnly);

		var newObj = new T();

		foreach (var fieldInfo in fieldInfos)
		{
			var fieldName = fieldInfo.Name;
			var fieldKey = string.Format("{0}-{1}-{2}", t, fieldInfo.MemberType, fieldName);

			if(fieldInfo.FieldType == typeof(int))
			{
				var val = PlayerPrefs.GetInt (fieldKey);
				Debug.Log (val);
				fieldInfo.SetValue(newObj, (int)val);
			}	
			else if(fieldInfo.FieldType == typeof(float))
			{
				var val = PlayerPrefs.GetFloat (fieldKey);
				fieldInfo.SetValue(newObj, (float)val);
			}
			else if(fieldInfo.FieldType == typeof(string))
			{
				var val = PlayerPrefs.GetString (fieldKey);
				fieldInfo.SetValue(newObj, (string)val);
			}
			else if(fieldInfo.FieldType == typeof(long))
			{
				var val = PlayerPrefsX.GetLong (fieldKey);
				fieldInfo.SetValue(newObj, (long)val);
			}
			else if(fieldInfo.FieldType == typeof(Vector2))
			{
				var val = PlayerPrefsX.GetVector2 (fieldKey, Vector2.zero);
				fieldInfo.SetValue(newObj, (Vector2)val);
			}
			else if(fieldInfo.FieldType == typeof(Quaternion))
			{
				var val = PlayerPrefsX.GetQuaternion (fieldKey);
				fieldInfo.SetValue(newObj, (Quaternion)val);
			}
			else if(fieldInfo.FieldType == typeof(Color))
			{
				var val = PlayerPrefsX.GetColor (fieldKey);
				fieldInfo.SetValue(newObj, (Color)val);
			}
			// array.
			else if(fieldInfo.FieldType == typeof(int[]))
			{
				var val = PlayerPrefsX.GetIntArray (fieldKey);
				fieldInfo.SetValue(newObj, (int[])val);
			}
			else if(fieldInfo.FieldType == typeof(float[]))
			{
				var val = PlayerPrefsX.GetFloatArray (fieldKey);
				fieldInfo.SetValue(newObj, (float[])val);
			}
			else if(fieldInfo.FieldType == typeof(string[]))
			{
				var val = PlayerPrefsX.GetStringArray (fieldKey);
				fieldInfo.SetValue(newObj, (string[])val);
			}
			else if(fieldInfo.FieldType == typeof(Quaternion[]))
			{
				var val = PlayerPrefsX.GetQuaternionArray (fieldKey);
				fieldInfo.SetValue(newObj, (Quaternion[])val);
			}
			else if(fieldInfo.FieldType == typeof(Color[]))
			{
				var val = PlayerPrefsX.GetColorArray (fieldKey);
				fieldInfo.SetValue(newObj, (Color[])val);
			}
			// list.
			else if(fieldInfo.FieldType == typeof(List<int>))
			{
				var val = PlayerPrefsX.GetIntArray (fieldKey);
				fieldInfo.SetValue(newObj, val.OfType<int>().ToList());
			}
			else if(fieldInfo.FieldType == typeof(List<float>))
			{
				var val = PlayerPrefsX.GetFloatArray (fieldKey);
				fieldInfo.SetValue(newObj, val.OfType<float>().ToList());
			}
			else if(fieldInfo.FieldType == typeof(List<string>))
			{
				var val = PlayerPrefsX.GetStringArray (fieldKey);
				fieldInfo.SetValue(newObj, val.OfType<string>().ToList());
			}
			else if(fieldInfo.FieldType == typeof(List<Quaternion>))
			{
				var val = PlayerPrefsX.GetQuaternionArray (fieldKey);
				fieldInfo.SetValue(newObj, (Quaternion[])val);
			}
			else if(fieldInfo.FieldType == typeof(List<Color>))
			{
				var val = PlayerPrefsX.GetColorArray (fieldKey);
				fieldInfo.SetValue(newObj, (Color[])val);
			}
			// other.
			else
			{
				Debug.LogError("Un known type.");
			}
		}

		if (newObj != null)
		{
			return newObj;
		}

		return defaultValue;
	}

	public static bool SetObject(string name, object value)
	{
		Type t = value.GetType();
		FieldInfo[] fieldInfos = t.GetFields(BindingFlags.Public | BindingFlags.NonPublic |
			BindingFlags.Instance | BindingFlags.Static |
			BindingFlags.DeclaredOnly);

		try
		{
			foreach (var fieldInfo in fieldInfos)
			{
				var fieldName = fieldInfo.Name;
				var fieldKey = string.Format("{0}-{1}-{2}-{3}", name, t, fieldInfo.MemberType, fieldName);

				if(fieldInfo.FieldType == typeof(int))
				{
					var val = (int)fieldInfo.GetValue(value);
					PlayerPrefs.SetInt (fieldKey, val);
				}	
				else if(fieldInfo.FieldType == typeof(float))
				{
					var val = (float)fieldInfo.GetValue(value);
					PlayerPrefs.SetFloat (fieldKey, val);
				}
				else if(fieldInfo.FieldType == typeof(string))
				{
					var val = (string)fieldInfo.GetValue(value);
					PlayerPrefs.SetString (fieldKey, val);
				}
				else if(fieldInfo.FieldType == typeof(long))
				{
					var val = (long)fieldInfo.GetValue(value);
					PlayerPrefsX.SetLong (fieldKey, val);
				}
				// Unity val.
				else if(fieldInfo.FieldType == typeof(Vector2))
				{
					var val = (Vector2)fieldInfo.GetValue(value);
					PlayerPrefsX.SetVector2 (fieldKey, val);
				}
				else if(fieldInfo.FieldType == typeof(Vector3))
				{
					var val = (Vector3)fieldInfo.GetValue(value);
					PlayerPrefsX.SetVector3 (fieldKey, val);
				}
				else if(fieldInfo.FieldType == typeof(Quaternion))
				{
					var val = (Quaternion)fieldInfo.GetValue(value);
					PlayerPrefsX.SetQuaternion (fieldKey, val);
				}
				else if(fieldInfo.FieldType == typeof(Color))
				{
					var val = (Color)fieldInfo.GetValue(value);
					PlayerPrefsX.SetColor (fieldKey, val);
				}
				// array.
				else if(fieldInfo.FieldType == typeof(int[]))
				{
					var val = (int[])fieldInfo.GetValue(value);
					PlayerPrefsX.SetIntArray (fieldKey, val);
				}
				else if(fieldInfo.FieldType == typeof(float[]))
				{
					var val = (float[])fieldInfo.GetValue(value);
					PlayerPrefsX.SetFloatArray (fieldKey, val);
				}
				else if(fieldInfo.FieldType == typeof(string[]))
				{
					var val = (string[])fieldInfo.GetValue(value);
					PlayerPrefsX.SetStringArray (fieldKey, val);
				}
				else if(fieldInfo.FieldType == typeof(Quaternion[]))
				{
					var val = (Quaternion[])fieldInfo.GetValue(value);
					PlayerPrefsX.SetQuaternionArray (fieldKey, val);
				}
				else if(fieldInfo.FieldType == typeof(Color[]))
				{
					var val = (Color[])fieldInfo.GetValue(value);
					PlayerPrefsX.SetColorArray (fieldKey, val);
				}
				// list.
				else if(fieldInfo.FieldType == typeof(List<int>))
				{
					var val = (List<int>)fieldInfo.GetValue(value);
					PlayerPrefsX.SetIntArray (fieldKey, val.ToArray());
				}
				else if(fieldInfo.FieldType == typeof(List<float>))
				{
					var val = (List<float>)fieldInfo.GetValue(value);
					PlayerPrefsX.SetFloatArray (fieldKey, val.ToArray());
				}
				else if(fieldInfo.FieldType == typeof(List<string>))
				{
					var val = (List<string>)fieldInfo.GetValue(value);
					PlayerPrefsX.SetStringArray (fieldKey, val.ToArray());
				}
				else if(fieldInfo.FieldType == typeof(List<Quaternion>))
				{
					var val = (Quaternion[])fieldInfo.GetValue(value);
					PlayerPrefsX.SetQuaternionArray (fieldKey, val.ToArray());
				}
				else if(fieldInfo.FieldType == typeof(List<Color>))
				{
					var val = (Color[])fieldInfo.GetValue(value);
					PlayerPrefsX.SetColorArray (fieldKey, val.ToArray());
				}
				else
				{
					Debug.LogError("Un known type.");
				}
			}
		}
		catch
		{
			return false;
		}
		return true;
	}
}

使い方

using UnityEngine;
using System.Collections;

class Hoge
{
    public string hogePub;
    public int intPub;
    private int bar;
    private string fuga;
    private string hoge;
}

public class Test : MonoBehaviour
{
    // Use this for initialization
    void Start () {

        var hoge = new Hoge{hogePub="hoge", intPub=100};
        PlayerPrefsX2.SetObject("test", hoge);

        var a = PlayerPrefsX2.GetObject<Hoge> ("test", null);
        Debug.Log (a.hogePub);
        Debug.Log (a.intPub);
    }
}