unity3d 状态存储 PlayerPrefs高级用法

using UnityEngine;
using System.Xml.Serialization;
using System.IO;

public class StateStorage{
 
 public static T LoadData( string key ){
  if ( PlayerPrefs.HasKey( key ) ) {  
   XmlSerializer serializer = new XmlSerializer( typeof( T ) );
   StringReader sr = new StringReader( PlayerPrefs.GetString( key ) );
   return ( T )serializer.Deserialize( sr );
  }else{
   return default(T);
  }
 } 
 
 public static void SaveData( string key, T source ){
  XmlSerializer serializer = new XmlSerializer( typeof( T ) );
  StringWriter sw = new StringWriter();
  serializer.Serialize( sw, source );
  PlayerPrefs.SetString( key, sw.ToString() );
 }
 
 public static void ClearData( string key ){
  PlayerPrefs.DeleteKey( key );
 }
 
}