iOS 开发 网络实时监测

原文地址：iOS 开发 网络实时监测 作者：咚咚大魔王

  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 *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

{

// 开启网络状况的监听

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reachabilityChanged:) name:kReachabilityChangedNotification object:nil];

    

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

//开始监听，会启动一个run loop

    [self.hostReach startNotifier]; 

}

 

 

-(void)reachabilityChanged:(NSNotification *)note

{

    Reachability *currReach = [note object];

    NSParameterAssert([currReach isKindOfClass:[Reachability class]]);

    

    //对连接改变做出响应处理动作

    NetworkStatus status = [currReach currentReachabilityStatus];

    //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:nil cancelButtonTitle:@"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

{

    [super viewWillAppear: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:nil cancelButtonTitle:@"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。