iOS Reachability监控网络使用

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第一步:在AppDelegate.h添加头文件"Reachability.h"

第二步:导入框架SystemConfiguration.frame

第三步: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。