iOS 开发 网络实时监测

首先在AppDelegate.h添加头文件"Reachability.h",导入框架SystemConfiguration.frame 

下面是代码：

- (BOOL)application:(UIApplication *)applicationdidFinishLaunchingWithOptions:(NSDictionary *)launchOptions

{

//开启网络状况的监听

   [[NSNotificationCenterdefaultCenter]addObserver:self selector:@selector(reachabilityChanged:) name:kReachabilityChangedNotificationobject:nil];

    

   self.hostReach =[ReachabilityreachabilityWithHostName:@"www.baidu.com"] ;

//开始监听，会启动一个runloop

   [self.hostReach startNotifier]; 

}

 

 

-(void)reachabilityChanged:(NSNotification *)note

{

   Reachability *currReach = [noteobject];

   NSParameterAssert([currReachisKindOfClass:[Reachability class]]);

    

   //对连接改变做出响应处理动作

   NetworkStatus status = [currReachcurrentReachabilityStatus];

   //如果没有连接到网络就弹出提醒实况

   self.isReachable = YES;

   if(status == NotReachable)

    {

       UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"网络连接异常"message:nil delegate:nilcancelButtonTitle:@"确定"otherButtonTitles:nil];

       [alert show];

       [alert release];

      self.isReachable = NO;

      return;

    }

   if (status==kReachableViaWiFi||status==kReachableViaWWAN){

       

       UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"网络连接信息"message:@"网络连接正常"delegate:nil cancelButtonTitle:@"确定"otherButtonTitles:nil];

//       [alert show];

       [alert release];

      self.isReachable = YES;

}

}

然后在每个页面的viewWillAppear:加上：

-(void)viewWillAppear:(BOOL)animated

{

   [superviewWillAppear:YES];

   AppDelegate *appDlg = (AppDelegate *)[[UIApplication sharedApplication] delegate];

   if(appDlg.isReachable)

    {

       NSLog(@"网络已连接");//执行网络正常时的代码

    }

   else

    {

       NSLog(@"网络连接异常");//执行网络异常时的代码

       UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"网络连接异常"message:nil delegate:nilcancelButtonTitle:@"确定"otherButtonTitles:nil];

       [alert show];

       [alert release];

       

    }

}

这样就可以检查到在运行程序时网络突然的中断和连接。