当我试着在我的iPhone上检查网络连接时，我得到了一堆错误。有人能帮我解决这个问题吗?
代码:
import Foundation
import SystemConfiguration
public class Reachability {
class func isConnectedToNetwork() -> Bool {
var zeroAddress = sockaddr_in()
zeroAddress.sin_len = UInt8(sizeofValue(zeroAddress))
zeroAddress.sin_family = sa_family_t(AF_INET)
let defaultRouteReachability = withUnsafePointer(&zeroAddress) {
SCNetworkReachabilityCreateWithAddress(nil, UnsafePointer($0))
}
var flags: SCNetworkReachabilityFlags = 0
if SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags) == 0 {
return false
}
let isReachable = (flags & UInt32(kSCNetworkFlagsReachable)) != 0
let needsConnection = (flags & UInt32(kSCNetworkFlagsConnectionRequired)) != 0
return (isReachable && !needsConnection) ? true : false
}
}
代码的错误:
如果它是不可读的，错误1说:
'Int'不能转换为'SCNetworkReachabilityFlags'
错误2和3:
找不到一个超载的'init'接受提供的参数
这些答案中有许多已经不再适用。
原因是使用vpn(因为冠状病毒，我们现在通过vpn而不是公司的wifi进行测试)
使用苹果的网络框架，并基于这里的代码https://medium.com/@udaykiran.munaga/swift-check-for-internet-connectivity-14e355fa10c5，我能够分别检测到wifi和蜂窝网络。由于使用vpn，路径通常保持满意，因此isConnectedToNetwork()总是返回true。
下面的代码使用了apple Network框架，但重新编写，以便在现有代码中仍然使用Reachability.isConnectedToNetwork()。
import Network
class Reachability {
static let shared = Reachability()
let monitorForWifi = NWPathMonitor(requiredInterfaceType: .wifi)
let monitorForCellular = NWPathMonitor(requiredInterfaceType: .cellular)
private var wifiStatus: NWPath.Status = .requiresConnection
private var cellularStatus: NWPath.Status = .requiresConnection
var isReachable: Bool { wifiStatus == .satisfied || isReachableOnCellular }
var isReachableOnCellular: Bool { cellularStatus == .satisfied }
func startMonitoring() {
monitorForWifi.pathUpdateHandler = { [weak self] path in
self?.wifiStatus = path.status
if path.status == .satisfied {
DLog.message("Wifi is connected!")
// post connected notification
} else {
DLog.message("No wifi connection.")
// post disconnected notification
}
}
monitorForCellular.pathUpdateHandler = { [weak self] path in
self?.cellularStatus = path.status
if path.status == .satisfied {
DLog.message("Cellular connection is connected!")
// post connected notification
} else {
DLog.message("No cellular connection.")
// post disconnected notification
}
}
let queue = DispatchQueue(label: "NetworkMonitor")
monitorForCellular.start(queue: queue)
monitorForWifi.start(queue: queue)
}
func stopMonitoring() {
monitorForWifi.cancel()
monitorForCellular.cancel()
}
class func isConnectedToNetwork() -> Bool {
return shared.isReachable
}
}
然后在你的Appdelegate中didFinishLaunchingWithOptions: start monitoring。
Reachability.shared.startMonitoring()
如果你的项目有一个高于或等于iOS 12的目标，并使用组合，你可以使用这一小段代码。
import Combine
import Network
enum NerworkType {
case wifi
case cellular
case loopBack
case wired
case other
}
protocol ReachabilityServiceContract {
var reachabilityInfos: PassthroughSubject<NWPath, Never> { get set }
var isNetworkAvailable: CurrentValueSubject<Bool, Never> { get set }
var typeOfCurrentConnection: PassthroughSubject<NerworkType, Never> { get set }
}
final class ReachabilityService: ReachabilityServiceContract {
var reachabilityInfos: PassthroughSubject<NWPath, Never> = .init()
var isNetworkAvailable: CurrentValueSubject<Bool, Never> = .init(false)
var typeOfCurrentConnection: PassthroughSubject<NerworkType, Never> = .init()
private let monitor: NWPathMonitor
private let backgroudQueue = DispatchQueue.global(qos: .background)
init() {
monitor = NWPathMonitor()
setUp()
}
init(with interFaceType: NWInterface.InterfaceType) {
monitor = NWPathMonitor(requiredInterfaceType: interFaceType)
setUp()
}
deinit {
monitor.cancel()
}
}
private extension ReachabilityService {
func setUp() {
monitor.pathUpdateHandler = { [weak self] path in
self?.reachabilityInfos.send(path)
switch path.status {
case .satisfied:
self?.isNetworkAvailable.send(true)
case .unsatisfied, .requiresConnection:
self?.isNetworkAvailable.send(false)
@unknown default:
self?.isNetworkAvailable.send(false)
}
if path.usesInterfaceType(.wifi) {
self?.typeOfCurrentConnection.send(.wifi)
} else if path.usesInterfaceType(.cellular) {
self?.typeOfCurrentConnection.send(.cellular)
} else if path.usesInterfaceType(.loopback) {
self?.typeOfCurrentConnection.send(.loopBack)
} else if path.usesInterfaceType(.wiredEthernet) {
self?.typeOfCurrentConnection.send(.wired)
} else if path.usesInterfaceType(.other) {
self?.typeOfCurrentConnection.send(.other)
}
}
monitor.start(queue: backgroudQueue)
}
}
只要订阅你想要跟踪的变量，你就会得到任何变化的更新。
更新版本的@martin的答案Swift 5+使用组合。它还包括iOS 14的不可用原因检查。
import Combine
import Network
enum NetworkType {
case wifi
case cellular
case loopBack
case wired
case other
}
final class ReachabilityService: ObservableObject {
@Published var reachabilityInfos: NWPath?
@Published var isNetworkAvailable: Bool?
@Published var typeOfCurrentConnection: NetworkType?
private let monitor = NWPathMonitor()
private let backgroundQueue = DispatchQueue.global(qos: .background)
init() {
setUp()
}
init(with interFaceType: NWInterface.InterfaceType) {
setUp()
}
deinit {
monitor.cancel()
}
}
private extension ReachabilityService {
func setUp() {
monitor.pathUpdateHandler = { [weak self] path in
self?.reachabilityInfos = path
switch path.status {
case .satisfied:
print("ReachabilityService: satisfied")
self?.isNetworkAvailable = true
break
case .unsatisfied:
print("ReachabilityService: unsatisfied")
if #available(iOS 14.2, *) {
switch path.unsatisfiedReason {
case .notAvailable:
print("ReachabilityService: unsatisfiedReason: notAvailable")
break
case .cellularDenied:
print("ReachabilityService: unsatisfiedReason: cellularDenied")
break
case .wifiDenied:
print("ReachabilityService: unsatisfiedReason: wifiDenied")
break
case .localNetworkDenied:
print("ReachabilityService: unsatisfiedReason: localNetworkDenied")
break
@unknown default:
print("ReachabilityService: unsatisfiedReason: default")
}
} else {
// Fallback on earlier versions
}
self?.isNetworkAvailable = false
break
case .requiresConnection:
print("ReachabilityService: requiresConnection")
self?.isNetworkAvailable = false
break
@unknown default:
print("ReachabilityService: default")
self?.isNetworkAvailable = false
}
if path.usesInterfaceType(.wifi) {
self?.typeOfCurrentConnection = .wifi
} else if path.usesInterfaceType(.cellular) {
self?.typeOfCurrentConnection = .cellular
} else if path.usesInterfaceType(.loopback) {
self?.typeOfCurrentConnection = .loopBack
} else if path.usesInterfaceType(.wiredEthernet) {
self?.typeOfCurrentConnection = .wired
} else if path.usesInterfaceType(.other) {
self?.typeOfCurrentConnection = .other
}
}
monitor.start(queue: backgroundQueue)
}
}
用法:
在视图模型中:
private let reachability = ReachabilityService()
init() {
reachability.$isNetworkAvailable.sink { [weak self] isConnected in
self?.isConnected = isConnected ?? false
}.store(in: &cancelBag)
}
在你的控制器中:
viewModel.$isConnected.sink { [weak self] isConnected in
print("isConnected: \(isConnected)")
DispatchQueue.main.async {
//Update your UI in here
}
}.store(in: &bindings)
这些答案中有许多已经不再适用。
原因是使用vpn(因为冠状病毒，我们现在通过vpn而不是公司的wifi进行测试)
使用苹果的网络框架，并基于这里的代码https://medium.com/@udaykiran.munaga/swift-check-for-internet-connectivity-14e355fa10c5，我能够分别检测到wifi和蜂窝网络。由于使用vpn，路径通常保持满意，因此isConnectedToNetwork()总是返回true。
下面的代码使用了apple Network框架，但重新编写，以便在现有代码中仍然使用Reachability.isConnectedToNetwork()。
import Network
class Reachability {
static let shared = Reachability()
let monitorForWifi = NWPathMonitor(requiredInterfaceType: .wifi)
let monitorForCellular = NWPathMonitor(requiredInterfaceType: .cellular)
private var wifiStatus: NWPath.Status = .requiresConnection
private var cellularStatus: NWPath.Status = .requiresConnection
var isReachable: Bool { wifiStatus == .satisfied || isReachableOnCellular }
var isReachableOnCellular: Bool { cellularStatus == .satisfied }
func startMonitoring() {
monitorForWifi.pathUpdateHandler = { [weak self] path in
self?.wifiStatus = path.status
if path.status == .satisfied {
DLog.message("Wifi is connected!")
// post connected notification
} else {
DLog.message("No wifi connection.")
// post disconnected notification
}
}
monitorForCellular.pathUpdateHandler = { [weak self] path in
self?.cellularStatus = path.status
if path.status == .satisfied {
DLog.message("Cellular connection is connected!")
// post connected notification
} else {
DLog.message("No cellular connection.")
// post disconnected notification
}
}
let queue = DispatchQueue(label: "NetworkMonitor")
monitorForCellular.start(queue: queue)
monitorForWifi.start(queue: queue)
}
func stopMonitoring() {
monitorForWifi.cancel()
monitorForCellular.cancel()
}
class func isConnectedToNetwork() -> Bool {
return shared.isReachable
}
}
然后在你的Appdelegate中didFinishLaunchingWithOptions: start monitoring。
Reachability.shared.startMonitoring()
虽然它可能不能直接确定手机是否连接到网络，但最简单的解决方案是“ping”谷歌或其他服务器(除非手机连接到网络，否则这是不可能的):
private var urlSession:URLSession = {
var newConfiguration:URLSessionConfiguration = .default
newConfiguration.waitsForConnectivity = false
newConfiguration.allowsCellularAccess = true
return URLSession(configuration: newConfiguration)
}()
public func canReachGoogle() -> Bool
{
let url = URL(string: "https://8.8.8.8")
let semaphore = DispatchSemaphore(value: 0)
var success = false
let task = urlSession.dataTask(with: url!)
{ data, response, error in
if error != nil
{
success = false
}
else
{
success = true
}
semaphore.signal()
}
task.resume()
semaphore.wait()
return success
}
如果您担心服务器可能宕机或阻塞您的IP，您总是可以以类似的方式ping多个服务器，并返回它们中的任何一个是否可达。或者让别人专门为这个目的设置一个专用服务器。
