一、AFNetworing检测网络

```OC 

AFNetworkReachabilityManager *manager = [AFNetworkReachabilityManager sharedManager];

[manager setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {

// 当网络状态改变时调用

switch (status) {

case AFNetworkReachabilityStatusUnknown:

NSLog(@"未知网络");

break;

case AFNetworkReachabilityStatusNotReachable:

NSLog(@"没有网络");

break;

case AFNetworkReachabilityStatusReachableViaWWAN:

NSLog(@"手机自带网络");

break;

case AFNetworkReachabilityStatusReachableViaWiFi:

NSLog(@"WIFI");

break;

}

}];

//开始监控

[manager startMonitoring]

```