保存

PlayerPrefs.SetString("username", "Alice");
PlayerPrefs.SetInt("level", 5);
PlayerPrefs.Save(); // 可选，但推荐写

读取

string username = PlayerPrefs.GetString("username", "defaultName");
int level = PlayerPrefs.GetInt("level", 0);

删除

PlayerPrefs.DeleteKey("username");
PlayerPrefs.DeleteAll();