通過Swift獲取當前網絡狀態

通過第三方庫Alamofire獲取網絡狀態只能獲取到ethernetOrWiFi、cellular、notReachable、unknown這幾種網絡狀態，不能準確的獲取到Wifi/5G/4G/3G/2G狀態，于是通過系統SystemConfiguration跟CoreTelephony庫來實現獲取當前對應的網絡狀態，實現代碼如下：

import CoreTelephony import SystemConfiguration/// 無網絡返回字樣 private static var notReachable: String {get {return "notReachable"}}/// 獲取網絡類型 private static func getNetworkType() -> String {var zeroAddress = sockaddr_storage()bzero(&zeroAddress, MemoryLayout<sockaddr_storage>.size)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) { address inSCNetworkReachabilityCreateWithAddress(nil, address)}}guard let defaultRouteReachability = defaultRouteReachability else {return notReachable}var flags = SCNetworkReachabilityFlags()let didRetrieveFlags = SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags)guard didRetrieveFlags == true,(flags.contains(.reachable) && !flags.contains(.connectionRequired)) == trueelse {return notReachable}if flags.contains(.connectionRequired) {return notReachable} else if flags.contains(.isWWAN) {return self.cellularType()} else {return "WiFi"}}/// 獲取蜂窩數據類型private static func cellularType() -> String {let info = CTTelephonyNetworkInfo()var status: Stringif #available(iOS 12.0, *) {guard let dict = info.serviceCurrentRadioAccessTechnology,let firstKey = dict.keys.first,let statusTemp = dict[firstKey] else {return notReachable}status = statusTemp} else {guard let statusTemp = info.currentRadioAccessTechnology else {return notReachable}status = statusTemp}if #available(iOS 14.1, *) {if status == CTRadioAccessTechnologyNR || status == CTRadioAccessTechnologyNRNSA {return "5G"}}switch status {case CTRadioAccessTechnologyGPRS,CTRadioAccessTechnologyEdge,CTRadioAccessTechnologyCDMA1x:return "2G"case CTRadioAccessTechnologyWCDMA,CTRadioAccessTechnologyHSDPA,CTRadioAccessTechnologyHSUPA,CTRadioAccessTechnologyeHRPD,CTRadioAccessTechnologyCDMAEVDORev0,CTRadioAccessTechnologyCDMAEVDORevA,CTRadioAccessTechnologyCDMAEVDORevB:return "3G"case CTRadioAccessTechnologyLTE:return "4G"default:return notReachable}}

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