IOS使用Reachability实时检测网络连接状况

OS使用Reachability实时检测网络连接状况

//在程序的启动处，开启通知

- (BOOL)application:(UIApplication *)applicationdidFinishLaunchingWithOptions:(NSDictionary *)launchOptions

{

//.....

//开启网络状况的监听

[[NSNotificationCenter defaultCenter] addObserver:self

selector:@selector(reachabilityChanged:)

name: kReachabilityChangedNotification

object: nil];

hostReach =[[Reachability reachabilityWithHostName:@"www.google.com"] retain];//可以以多种形式初始化

[hostReach startNotifier]; //开始监听,会启动一个run
loop

[self updateInterfaceWithReachability: hostReach];

//.....

}

// 连接改变

- (void)reachabilityChanged: (NSNotification*)note

{

Reachability*curReach = [note object];

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

[self updateInterfaceWithReachability:curReach];

}

//处理连接改变后的情况

- (void)updateInterfaceWithReachability: (Reachability*)curReach

{

//对连接改变做出响应的处理动作。

NetworkStatus status=[curReach currentReachabilityStatus];

if (status== NotReachable) { //没有连接到网络就弹出提实况

UIAlertView *alert= [[UIAlertView alloc] initWithTitle:@"MyApp
Name"

message:@"NotReachable"

delegate:nil

cancelButtonTitle:@"YES" otherButtonTitles:nil];

[alert show];

[alert release];

}

}