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
There is no real way to do this, even APIs that do this will try to connect to a particular service and tell you if it succeed after previously failing, the best approach is to just try to connect to your service and handle the error appropriately, if you want some service that will notify you when you become connected, all that will happens is that it periodically calls to a fixed service until it gets a response and then let you know that it succeed, what if the problem is not the internet itself but the specific service you are trying to connect to.
最好的方法是在你的连接方法中设计处理这个问题的方法,你可以在给定的时间内触发重试,这取决于你的错误,也许是失败的数量,你可以返回一个错误,你可以用它来显示一个错误消息,给用户一个重试的可能性,也许是尝试几次,然后返回和错误的组合。
另一个类似的问题是发送你已经发送但还没有得到响应的消息,最好还是写你的应用程序来处理这个,忽略请求,直到它等待的请求返回,如果请求不同,取消等待请求,等等
这些东西可以以非常通用的方式编写,所以它们可以用于应用程序的许多不同方面,甚至不同的项目。
在项目中创建一个新的Swift文件,命名为Reachability.swift。将以下代码剪切并粘贴到其中以创建您的类。
import Foundation
import SystemConfiguration
open class Reachability {
class func isConnectedToNetwork() -> Bool {
var zeroAddress = sockaddr_in()
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()
if !SCNetworkReachabilityGetFlags(defaultRouteReachability!, &flags) {
return false
}
let isReachable = (flags.rawValue & UInt32(kSCNetworkFlagsReachable)) != 0
let needsConnection = (flags.rawValue & UInt32(kSCNetworkFlagsConnectionRequired)) != 0
return (isReachable && !needsConnection)
}
}
你可以在代码的任何地方调用Reachability,就像
if Reachability.isConnectedToNetwork() {
print("Network is connected")
} else {
print("Network is not connected")
}
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!")
}
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)")
}