一.AFN

 (void)afnReachability{
    
    AFNetworkReachabilityManager *manager = [AFNetworkReachabilityManager sharedManager];
//    AFNetworkReachabilityStatusUnknown          = -1,
//    AFNetworkReachabilityStatusNotReachable     = 0,
//    AFNetworkReachabilityStatusReachableViaWWAN = 1,
//    AFNetworkReachabilityStatusReachableViaWiFi = 2,
    [manager setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {
        switch (status) {
            case AFNetworkReachabilityStatusReachableViaWiFi:
                NSLog(@"WIFI");
                break;
            case AFNetworkReachabilityStatusReachableViaWWAN:
                NSLog(@"移动蜂窝");
                break;
            case AFNetworkReachabilityStatusNotReachable:
                NSLog(@"无网络");
                break;
            case AFNetworkReachabilityStatusUnknown:
                NSLog(@"未知");
                break;
            default:
                NSLog(@"未知");
                break;
        }
    }];
    [manager startMonitoring];
}

2.Reachability

@property (nonatomic, strong) Reachability *r;

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reachability) name:@"kReachabilityChangedNotification" object:nil];
    self.r = [Reachability reachabilityForLocalWiFi];
    [self.r startNotifier];
}

- (void)dealloc{
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

- (void)reachability{
//    NotReachable = 0,
//    ReachableViaWiFi = 2,
//    ReachableViaWWAN = 1
    if ([Reachability reachabilityForInternetConnection].currentReachabilityStatus == ReachableViaWWAN) {
        NSLog(@"移动蜂窝");
    }else if ([Reachability reachabilityForInternetConnection].currentReachabilityStatus == ReachableViaWiFi){
        NSLog(@"WIFI");
    }else if ([Reachability reachabilityForInternetConnection].currentReachabilityStatus == NotReachable){
        NSLog(@"无网络");
    }else{
        NSLog(@"未知");
    }
}