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
对于Swift 3, Swift 4(使用蜂窝和Wi-Fi):
import SystemConfiguration
public class Reachability {
class func isConnectedToNetwork() -> Bool {
var zeroAddress = sockaddr_in(sin_len: 0, sin_family: 0, sin_port: 0, sin_addr: in_addr(s_addr: 0), sin_zero: (0, 0, 0, 0, 0, 0, 0, 0))
zeroAddress.sin_len = UInt8(MemoryLayout.size(ofValue: zeroAddress))
zeroAddress.sin_family = sa_family_t(AF_INET)
let defaultRouteReachability = withUnsafePointer(to: &zeroAddress) {
$0.withMemoryRebound(to: sockaddr.self, capacity: 1) {zeroSockAddress in
SCNetworkReachabilityCreateWithAddress(nil, zeroSockAddress)
}
}
var flags: SCNetworkReachabilityFlags = SCNetworkReachabilityFlags(rawValue: 0)
if SCNetworkReachabilityGetFlags(defaultRouteReachability!, &flags) == false {
return false
}
/* Only Working for WIFI
let isReachable = flags == .reachable
let needsConnection = flags == .connectionRequired
return isReachable && !needsConnection
*/
// Working for Cellular and WIFI
let isReachable = (flags.rawValue & UInt32(kSCNetworkFlagsReachable)) != 0
let needsConnection = (flags.rawValue & UInt32(kSCNetworkFlagsConnectionRequired)) != 0
let ret = (isReachable && !needsConnection)
return ret
}
}
用法:
if Reachability.isConnectedToNetwork(){
print("Internet Connection Available!")
}else{
print("Internet Connection not Available!")
}
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
}
对于swift 3,我不能只使用RAJAMOHAN-S解决方案的可达性,因为如果有WiFi但没有互联网,它会返回“true”。因此,我通过URLSession类和完成处理程序实现了第二次验证。
这是全班同学。
import Foundation
import SystemConfiguration
public class Reachability {
class func isConnectedToNetwork() -> Bool {
var zeroAddress = sockaddr_in(sin_len: 0, sin_family: 0, sin_port: 0, sin_addr: in_addr(s_addr: 0), sin_zero: (0, 0, 0, 0, 0, 0, 0, 0))
zeroAddress.sin_len = UInt8(MemoryLayout.size(ofValue: zeroAddress))
zeroAddress.sin_family = sa_family_t(AF_INET)
let defaultRouteReachability = withUnsafePointer(to: &zeroAddress) {
$0.withMemoryRebound(to: sockaddr.self, capacity: 1) {zeroSockAddress in
SCNetworkReachabilityCreateWithAddress(nil, zeroSockAddress)
}
}
var flags: SCNetworkReachabilityFlags = SCNetworkReachabilityFlags(rawValue: 0)
if SCNetworkReachabilityGetFlags(defaultRouteReachability!, &flags) == false {
return false
}
// Working for Cellular and WIFI
let isReachable = (flags.rawValue & UInt32(kSCNetworkFlagsReachable)) != 0
let needsConnection = (flags.rawValue & UInt32(kSCNetworkFlagsConnectionRequired)) != 0
let ret = (isReachable && !needsConnection)
return ret
}
class func isInternetAvailable(webSiteToPing: String?, completionHandler: @escaping (Bool) -> Void) {
// 1. Check the WiFi Connection
guard isConnectedToNetwork() else {
completionHandler(false)
return
}
// 2. Check the Internet Connection
var webAddress = "https://www.google.com" // Default Web Site
if let _ = webSiteToPing {
webAddress = webSiteToPing!
}
guard let url = URL(string: webAddress) else {
completionHandler(false)
print("could not create url from: \(webAddress)")
return
}
let urlRequest = URLRequest(url: url)
let session = URLSession.shared
let task = session.dataTask(with: urlRequest, completionHandler: { (data, response, error) in
if error != nil || response == nil {
completionHandler(false)
} else {
completionHandler(true)
}
})
task.resume()
}
}
你可以这样称呼它,例如:
Reachability.isInternetAvailable(webSiteToPing: nil) { (isInternetAvailable) in
guard isInternetAvailable else {
// Inform user for example
return
}
// Do some action if there is Internet
}
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。
虽然没有直接回答你的问题,但我想提一下苹果公司最近有这样一个谈话:
https://developer.apple.com/videos/play/wwdc2018/714/
大约在9点55分,他谈到了做你正在问的事情:
检查连接
如果连接->做点什么
如果没有连接->执行其他操作(等待?重试?)
然而,这有一些陷阱:
如果在第二步中,它说它有连接,但0.5秒后他就没有了呢?
如果用户在代理的后面呢
最后但并非最不重要的是,如果这里的一些答案不能确定连通性呢?(我敢肯定,如果你快速切换你的连接,去wi-fi,然后关掉它(只是让它变得复杂),它几乎永远不能正确地判断我是否获得了连接)。
视频中说:“没有办法保证未来的行动是否会成功。”
以下是苹果公司的一些最佳实践:
设置waitsForConnectivity为true (https://developer.apple.com/documentation/foundation/urlsessionconfiguration/2908812-waitsforconnectivity)
响应委托方法taskIsWaitingForConnectivity (https://developer.apple.com/documentation/foundation/urlsessiontaskdelegate/2908819-urlsession)。这是苹果推荐的检查连接的方法,正如33:25的视频中提到的那样。
根据谈话,不应该有任何理由预先检查你是否有互联网连接,因为在你向服务器发送请求时,它可能并不准确。