AFNetworking网络状态监听

//创建网络监听管理者对象
AFNetworkReachabilityManager *manager = [AFNetworkReachabilityManager sharedManager];
//开始监听
[manager startMonitoring];
//监听回调
[manager setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {
    switch (status) {
        case AFNetworkReachabilityStatusUnknown:
            NSLog(@"未识别的网络");
            break;
                
        case AFNetworkReachabilityStatusNotReachable:
            NSLog(@"不可达的网络（未连接）");
            break;
                
        case AFNetworkReachabilityStatusReachableViaWiFi:
            NSLog(@"wifi的网络");
            break;
                
        case AFNetworkReachabilityStatusReachableViaWWAN:
            NSLog(@"2G,3G,4G...的网络");
            break;
                
        default:
            break;
    }
}];

ps：如果要在case中定义变量需要加花括号{}