网络监听万能代码

NSUserDefaults * defaults = [NSUserDefaults standardUserDefaults];

//根据不同的网络状态改变去做相应处理

[[AFNetworkReachabilityManager sharedManager] setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {

[defaults setObject:[NSNumber numberWithInteger:status]forKey:@"network"];

switch (status) {

case AFNetworkReachabilityStatusReachableViaWWAN:

{

UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"当前网络2g/3g/4g连接" message:nil delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];

[alert show];

[alert release];

}

break;

case AFNetworkReachabilityStatusReachableViaWiFi:

{

UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"当前网络wifi连接" message:nil delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];

[alert show];

[alert release];

}

break;

case AFNetworkReachabilityStatusNotReachable:

{

UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"当前网络不可用,请检查网络" message:nil delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];

[alert show];

[alert release];

}

break;

default:

break;

}

}];

//开始监控

[[AFNetworkReachabilityManager sharedManager] startMonitoring];

self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];