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。