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。