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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