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void Update () {
	if(Input.GetKeyDown(KeyCode.Escape)) {
		Application.Quit();
	}
}

void Start () {
	Input.backButtonLeavesApp = true;
}

using UnityEngine;
using System.Collections;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;

public class FileController : MonoBehaviour{

	public FileController(){
	}
	
    public static bool Save<T>( string prefKey, T serializableObject ){
        MemoryStream memoryStream = new MemoryStream();
#if UNITY_IPHONE || UNITY_IOS
		System.Environment.SetEnvironmentVariable("MONO_REFLECTION_SERIALIZER", "yes");
#endif
        BinaryFormatter bf = new BinaryFormatter();
        bf.Serialize( memoryStream, serializableObject );
 
        string tmp = System.Convert.ToBase64String( memoryStream.ToArray() );
        try {
            PlayerPrefs.SetString ( prefKey, tmp );
        } catch( PlayerPrefsException ) {
            return false;
        }
        return true;
    }
 
    public static T Load<T>( string prefKey ){
        if (!PlayerPrefs.HasKey(prefKey)) return default(T);
#if UNITY_IPHONE || UNITY_IOS
		System.Environment.SetEnvironmentVariable("MONO_REFLECTION_SERIALIZER", "yes");
#endif
        BinaryFormatter bf = new BinaryFormatter();
        string serializedData = PlayerPrefs.GetString( prefKey );
 
        MemoryStream dataStream = new MemoryStream( System.Convert.FromBase64String(serializedData) );
        T deserializedObject = (T)bf.Deserialize( dataStream );
 
        return deserializedObject;
	}
	
	public void save(SaveData data) {
		// 保存用クラスにデータを格納.
		FileController.Save("{PlayerPrefsに保存するキー}", data);
        PlayerPrefs.Save();
    }
    
	public SaveData load() {
		SaveData data_tmp = FileController.Load("{PlayerPrefsに保存するキー}");
		if( data_tmp != null){
			return data_tmp;
		}else{
			return null;
		}
	}