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本章节讲解如何使用swift连接网络，实时的监听到网络的状态，在主界面中进行调用，网络包含Wi-Fi 和 蜂窝。

1.封装一个判断是否有网络的类
2.在封装类注册通知
3.主界面接收注册通知，并且调用封装的网络类
4.成功测试，有网络为true，否则false

一：AllExpanded类

import UIKit
import WHToast
import MBProgressHUD
import SystemConfigurationclass AllExpanded{private var hud:MBProgressHUD?init() {startNetworkReachabilityNotifier()}func isConnectedToNetwork() -> Bool {var zeroAddress = sockaddr_storage()zeroAddress.ss_len = __uint8_t(MemoryLayout<sockaddr_storage>.size)zeroAddress.ss_family = sa_family_t(AF_INET)let defaultRouteReachability = withUnsafePointer(to: &zeroAddress) {$0.withMemoryRebound(to: sockaddr.self, capacity: 1) { zeroSockAddress inSCNetworkReachabilityCreateWithAddress(nil, zeroSockAddress)}}var flags: SCNetworkReachabilityFlags = []if SCNetworkReachabilityGetFlags(defaultRouteReachability!, &flags) == false {return false}let isReachable = flags.contains(.reachable)let needsConnection = flags.contains(.connectionRequired)let canConnectAutomatically = flags.contains(.connectionOnDemand) || flags.contains(.connectionOnTraffic)//let usesWiFi = flags.contains(.isWWAN)return isReachable && (!needsConnection || canConnectAutomatically)}func startNetworkReachabilityNotifier() {var zeroAddress = sockaddr_storage()zeroAddress.ss_len = __uint8_t(MemoryLayout<sockaddr_storage>.size)zeroAddress.ss_family = sa_family_t(AF_INET)let defaultRouteReachability = withUnsafePointer(to: &zeroAddress) {$0.withMemoryRebound(to: sockaddr.self, capacity: 1) { zeroSockAddress inSCNetworkReachabilityCreateWithAddress(nil, zeroSockAddress)}}var context = SCNetworkReachabilityContext(version: 0,info: UnsafeMutableRawPointer(Unmanaged.passUnretained(self).toOpaque()),retain: nil,release: nil,copyDescription: nil)if SCNetworkReachabilitySetCallback(defaultRouteReachability!, { (_, flags, info) inlet reachability = Unmanaged<AllExpanded>.fromOpaque(info!).takeUnretainedValue()reachability.notifyReachabilityChanged(flags)}, &context) {SCNetworkReachabilityScheduleWithRunLoop(defaultRouteReachability!, CFRunLoopGetCurrent(), CFRunLoopMode.defaultMode.rawValue)}}func notifyReachabilityChanged(_ flags: SCNetworkReachabilityFlags) {let isReachable = flags.contains(.reachable)let needsConnection = flags.contains(.connectionRequired)let canConnectAutomatically = flags.contains(.connectionOnDemand) || flags.contains(.connectionOnTraffic)let reachable = isReachable && (!needsConnection || canConnectAutomatically)NotificationCenter.default.post(name: .reachabilityChanged, object: nil, userInfo: ["reachable": reachable])}}extension Notification.Name {static let reachabilityChanged = Notification.Name("reachabilityChanged")
}

二：LoginViewController类

 override func viewDidLoad() {super.viewDidLoad()//接收注册的通知NotificationCenter.default.addObserver(self, selector: #selector(handleReachabilityChange(_:)), name: .reachabilityChanged, object: nil)
}@objc private func handleReachabilityChange(_ notification: Notification) {if let userInfo = notification.userInfo, let isReachable = userInfo["reachable"] as? Bool {//显示与隐藏红色的提示框(没有网络)if isReachable {loginView.netWorkVm.isHidden = true} else {loginView.netWorkVm.isHidden = false}}}

至此就阐述完毕，功能测试成功，运行到手机上，切换网络可实时的监听打印到数据信息；