在Swift Xcode 7.2.1中使用未解析的标识符'kCFStreamEventHasBytesAvailable'

Question

我在Swift中编写Socket编程。对于所有CoreFoundation常量，我收到错误：

  

使用未解析的标识符

1. 我已导入CoreFoundation

   import Foundation
   import CoreFoundation
   import CFNetwork
   

2. 添加了corefoundation框架

3. 尝试了Bridging标题

但以上都没有解决错误。

添加代码

import Cocoa
import Foundation
import CoreFoundation
import CFNetwork

class ViewController: NSViewController {

override func viewDidLoad() {
    super.viewDidLoad()



    // Do any additional setup after loading the view.
     CFSocketCreate(nil,             // Default allocator
        PF_INET,             // Protocol Family
        SOCK_STREAM,             // Socket Type
        IPPROTO_TCP,             // Protocol
        kCFSocketConnectCallBack,             // Callback flags
        (MyCFSocketCallback as! CFSocketCallBack),             // Callback method
        nil)

}

func MyCFSocketCallback(sref: CFSocketRef!, type: CFSocketCallBackType, inAddress: CFDataRef!, pData: UnsafePointer<Void>, pInfo: UnsafeMutablePointer<Void>) {

    switch type {
    case kCFSocketConnectCallBack:

        NSLog("Strem Event Open Completed")
        break;
    case kCFSocketAcceptCallBack:

        NSLog("Accept ")
        break;

    default:
        NSLog("received unexpected CFReadStream callback, CFStreamEventType")
    }

}

Code Snippet的截屏：