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。