iOS-检测网络可连接性

#pragma mark - 监测网络的可链接性
+ (void)netWorkReachabilityWithURLString:(NSString *)strUrl
{
    AFHTTPRequestOperationManager *manager = [[AFHTTPRequestOperationManager alloc] initWithBaseURL:[NSURL URLWithString:strUrl]];
    [manager.reachabilityManager setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {
        switch (status) {
            case AFNetworkReachabilityStatusUnknown:
            case AFNetworkReachabilityStatusNotReachable: {
                [[NSNotificationCenter defaultCenter] postNotificationName:DMNetworkInvalidNotification object:nil];
                UIAlertView *networkAlterView = [[UIAlertView alloc] initWithTitle:@"当前网络不可用，请检查您的网络设置。"
                                                                           message:nil
                                                                          delegate:self
                                                                 cancelButtonTitle:@"好"
                                                                 otherButtonTitles:nil, nil];
                [networkAlterView show];
            }
                break;
            case AFNetworkReachabilityStatusReachableViaWWAN:
                [[NSNotificationCenter defaultCenter] postNotificationName:DMNetworkActiveNotification object:nil];
                break;
            case AFNetworkReachabilityStatusReachableViaWiFi:
                [DMTools HUDError:DMRequestWIFINote toView:DMWindow];
                [[NSNotificationCenter defaultCenter] postNotificationName:DMNetworkActiveNotification object:nil];
                break;
        }
    }];
    [manager.reachabilityManager startMonitoring];
}