Swift 4 XCode 9中的可达性功能

Question

我想在xcode 9中实现可达性功能，但是在达到可达性类时出现此错误，如何解决此错误？“类型为“ SCNetworkReachability的值？” 没有成员“ takeRetainedValue””。这是我的代码

import UIKit
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(&zeroAddress) {
            SCNetworkReachabilityCreateWithAddress(nil, UnsafePointer($0)).takeRetainedValue()
        }

        var flags: SCNetworkReachabilityFlags = SCNetworkReachabilityFlags(rawValue: 0)
        if SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags) == 0 {
            return false
        }

        let isReachable = (flags.rawValue & UInt32(kSCNetworkFlagsReachable)) != 0
        let needsConnection = (flags.rawValue & UInt32(kSCNetworkFlagsConnectionRequired)) != 0

        return (isReachable && !needsConnection) ? true : false
    }

}

Answer 1

在Swift 4中编译代码时有很多错误。

一个与Swift 4兼容的版本是（请使用大写字母开头的名称类）

public class Reachability {

    class func isConnectedToNetwork() -> Bool {

        var zeroAddress = sockaddr()
        zeroAddress.sa_len = UInt8(MemoryLayout<sockaddr>.size)
        zeroAddress.sa_family = sa_family_t(AF_INET)

        guard let defaultRouteReachability = withUnsafePointer(to: &zeroAddress, {
            SCNetworkReachabilityCreateWithAddress(nil, UnsafePointer($0))
        }) else { return false }

        var flags = SCNetworkReachabilityFlags()
        guard SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags) else { return false }

        return flags.contains(.reachable) && !flags.contains(.connectionRequired)
    }

}