App没有启动的时候,接受到了消息通知.这个时候操作系统会按默认方式来展示一个alert，在App Icon上标记一个数字

1.当程序处于关闭状态收到推送消息时，点击图标或消息栏会调用- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions2.当程序处于前台工作时，这时候若收到消息推送会调用- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo3.当程序处于后台运行时，这时候若收到消息推送，点击图标或消息栏会调用- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo针对1种情况代码if (launchOptions) {        NSDictionary* pushInfo = [launchOptions objectForKey:@"UIApplicationLaunchOptionsRemoteNotificationKey"];        //此处必须用stringWithFormat转换下        if (pushInfo != nil) {                        UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"App关闭" message:[NSString stringWithFormat:@"%@",pushInfo] delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];            [alert show];        }    }针对2，3种情况代码if ([[userInfo objectForKey:@"aps"] objectForKey:@"alert"]!=NULL) {        // 当程序处于前台工作时，这时候若收到消息推送处理        if(application.applicationState == UIApplicationStateActive){                        UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"App前台运行" message:[[userInfo objectForKey:@"aps"] objectForKey:@"alert"] delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];            [alert show];        }        else  //当程序处于后台运行时，这时候若收到消息推送处理        {            UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"App后台运行" message:[NSString stringWithFormat:@"%@",userInfo] delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];            [alert show];                    }    }