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
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。
这里是我的解决方案swift 2.3与库(reach .swift)
进入你的Podfile并添加:
pod 'ReachabilitySwift', '~> 2.4' // swift 2.3
然后进入您的终端:
pod install
然后创建一个新的文件ReachabilityManager并添加下面的代码:
import Foundation
import ReachabilitySwift
enum ReachabilityManagerType {
case Wifi
case Cellular
case None
}
class ReachabilityManager {
static let sharedInstance = ReachabilityManager()
private var reachability: Reachability!
private var reachabilityManagerType: ReachabilityManagerType = .None
private init() {
do {
self.reachability = try Reachability.reachabilityForInternetConnection()
} catch {
print("Unable to create Reachability")
return
}
NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(ReachabilityManager.reachabilityChanged(_:)),name: ReachabilityChangedNotification,object: self.reachability)
do{
try self.reachability.startNotifier()
}catch{
print("could not start reachability notifier")
}
}
@objc private func reachabilityChanged(note: NSNotification) {
let reachability = note.object as! Reachability
if reachability.isReachable() {
if reachability.isReachableViaWiFi() {
self.reachabilityManagerType = .Wifi
} else {
self.reachabilityManagerType = .Cellular
}
} else {
self.reachabilityManagerType = .None
}
}
}
extension ReachabilityManager {
func isConnectedToNetwork() -> Bool {
return reachabilityManagerType != .None
}
}
如何使用:
进入你的AppDelegate.swift并添加下面的代码:
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
ReachabilityManager.sharedInstance
}
然后，当你想检查设备是否连接到互联网时，请:
if ReachabilityManager.sharedInstance.isConnectedToNetwork() {
// Connected
} else {
// Not connected
}
我改进了莱科斯的例子。我添加了一些额外的控件来解决双重触发问题，还添加了通知支持来侦听状态更改。
我为防止双重触发问题而添加的控件还显示了设备主要使用哪个连接源来访问互联网。
例如，即使设备同时连接到蜂窝网络和Wi-Fi，“状态”返回为“connectedViaWiFi”，以指示当前的互联网访问是通过Wi-Fi。
import Foundation
import Network
class Reachability {
enum StatusFlag {
case unknow
case noConnection
case connectedViaWiFi
case connectedViaCellular
}
static let connectionStatusHasChangedNotification = NSNotification.Name("Reachability.connectionStatusHasChangedNotification")
static let shared = Reachability()
private var monitorForWifi: NWPathMonitor?
private var monitorForCellular: NWPathMonitor?
private var wifiStatus: NWPath.Status = .requiresConnection
private var cellularStatus: NWPath.Status = .requiresConnection
private var ignoreInitialWiFiStatusUpdate: Bool = true
private var ignoreInitialCelluluarStatusUpdate: Bool = true
private var isReachableOnCellular: Bool { cellularStatus == .satisfied }
private var isReachableOnWiFi: Bool { wifiStatus == .satisfied }
var status: StatusFlag = .unknow {
didSet {
guard status != oldValue else { return }
DispatchQueue.main.async { [weak self] in
NotificationCenter.default.post(name: Self.connectionStatusHasChangedNotification,
object: self?.status)
}
}
}
func startMonitoring() {
monitorForWifi = NWPathMonitor(requiredInterfaceType: .wifi)
monitorForWifi?.pathUpdateHandler = { [weak self] path in
self?.wifiStatus = path.status
self?.ignoreInitialWiFiStatusUpdate = false
self?.updateStatus()
}
monitorForCellular = NWPathMonitor(requiredInterfaceType: .cellular)
monitorForCellular?.pathUpdateHandler = { [weak self] path in
self?.cellularStatus = path.status
self?.ignoreInitialCelluluarStatusUpdate = false
self?.updateStatus()
}
let queue = DispatchQueue.global(qos: .background)
monitorForCellular?.start(queue: queue)
monitorForWifi?.start(queue: queue)
}
func stopMonitoring() {
monitorForWifi?.cancel()
monitorForWifi = nil
monitorForCellular?.cancel()
monitorForCellular = nil
wifiStatus = .requiresConnection
cellularStatus = .requiresConnection
status = .unknow
ignoreInitialWiFiStatusUpdate = true
ignoreInitialCelluluarStatusUpdate = true
}
private func updateStatus() {
if ignoreInitialWiFiStatusUpdate || ignoreInitialCelluluarStatusUpdate {
return
}
if !(isReachableOnCellular && isReachableOnWiFi) {
if isReachableOnCellular && !isReachableOnWiFi {
status = .connectedViaCellular
} else if isReachableOnWiFi && !isReachableOnCellular {
status = .connectedViaWiFi
} else {
status = .noConnection
}
} else {
status = .connectedViaWiFi
}
}
static func isConnectedToNetwork() -> Bool {
return shared.isReachableOnCellular || shared.isReachableOnWiFi
}
}
示例使用
override func viewDidLoad() {
super.viewDidLoad()
NotificationCenter.default.addObserver(self, selector: #selector(reachabilityChanged(_:)), name: Reachability.connectionStatusHasChangedNotification, object: nil)
Reachability.shared.startMonitoring()
}
@objc func reachabilityChanged(_ sender: Notification) {
guard let statusFlag = sender.object as? Reachability.StatusFlag else { return }
print("TEST -> statusFlag: \(statusFlag)")
}
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。
我使用NSTimer和Alamofire制作了自己的解决方案:
import Alamofire
public class ConnectionHelper: NSObject {
var request: Alamofire.Request?
func isInternetConnected(completionHandler: Bool -> Void) {
NSTimer.scheduledTimerWithTimeInterval(5.0, target: self, selector: "requestTimeout", userInfo: nil, repeats: false)
request = Alamofire
.request(
Method.HEAD,
"http://www.testurl.com"
)
.response { response in
if response.3?.code == -999 {
completionHandler(
false
)
} else {
completionHandler(
true
)
}
}
}
func requestTimeout() {
request!.cancel()
}
}
NSTimer被用作超时，并且由于使用Alamofire超时的不可靠结果而被使用。请求应该发送到您认为可靠的URL，例如您自己的服务器或托管您所依赖的服务的服务器。
当计时器过期时，请求将被取消，并使用完成处理程序返回结果。
用法:
ConnectionHelper().isInternetConnected() { internetConnected in
if internetConnected {
// Connected
} else {
// Not connected
}
}
