Reachability检测联网状态

//
//  ViewController.swift
//  位移枚举
//
//  Created by zhang on 16/2/24.
//  Copyright © 2016年 jin. All rights reserved.
//
import UIKit

class ViewController: UIViewController {
    // 需要下载这个类
    let reach = Reachability(hostName: "baidu.com")
    override func viewDidLoad() {
        super.viewDidLoad()
        self.showStatus()
        // 监听联网状态的改变
        NSNotificationCenter.defaultCenter().addObserver(self, selector: "showStatus", name: kReachabilityChangedNotification, object: nil)
        // Do any additional setup after loading the view, typically from a nib.
    }
    deinit
    {
        // 移除整个控制器里所有的监听
        NSNotificationCenter.defaultCenter().removeObserver(self)
        // 移除监听
        NSNotificationCenter.defaultCenter().removeObserver(self, name: kReachabilityChangedNotification, object: nil)
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
                // Dispose of any resources that can be recreated.
    }
    func showStatus()
    {
        switch reach.currentReachabilityStatus().rawValue
        {
        case 0:
            print("没有联网")
            break
        case 1:
            print("wifi")
            break
        case 2:
            print("流量")
            break
        default:
            break
        }
    }
}