关于程序安按住Home键进入后台,回到前台调用的方法

进入后台:
//申请将主动辞去活动

• (void)applicationWillResignActive:(UIApplication *)application;
  //程序进入后台
• (void)applicationDidEnterBackground:(UIApplication *)application;

进入前台:
//程序即将进入前台

• (void)applicationWillEnterForeground:(UIApplication *)application;
  //程序变为活动状态
• (void)applicationDidBecomeActive:(UIApplication *)application;