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监听系统事件
程序加载完毕:
- 程序获取焦点
-(void)applicationDidBecomeActive:(UIApplication *)application
- 程序进入后台
-(void)applicationDidEnterBackground:(UIApplication *)application
- 程序失去焦点
-(void)applicationWillResignActive:(UIApplication *)application
- 程序从后台回到前台
-(void)applicationWillEnterForeground:(UIApplication *)application
- 程序内存警告，可能要终止程序
-(void)applicationDidReceiveMemoryWarning:(UIApplication *)application
- 程序即将退出
-(void)applicationWillTerminate:(UIApplication *)application
