Question

我正在尝试SimplePing app from Apple。但是没有调用委托方法。我想找到解决方案，但我也在这里寻求帮助。

谢谢。

这是完整的MainViewController类。

import UIKit

class MainViewController: UITableViewController, SimplePingDelegate {

    let hostName = "www.apple.com"

    override func viewDidLoad() {
        super.viewDidLoad()
        self.title = self.hostName
    }

    var pinger: SimplePing?
    var sendTimer: Timer?

    func start(forceIPv4: Bool, forceIPv6: Bool) {
        self.pingerWillStart()

        NSLog("start")

        let pinger = SimplePing(hostName: self.hostName)
        self.pinger = pinger

        if (forceIPv4 && !forceIPv6) {
            pinger.addressStyle = .icmPv4
        } else if (forceIPv6 && !forceIPv4) {
            pinger.addressStyle = .icmPv6
        }

        pinger.delegate = self
        pinger.start()
    }

    func stop() {
        NSLog("stop")
        self.pinger?.stop()
        self.pinger = nil

        self.sendTimer?.invalidate()
        self.sendTimer = nil

        self.pingerDidStop()
    }

    func sendPing() {
        self.pinger!.send(with: nil)
    }

    // MARK: pinger delegate callback

    private func simplePing(pinger: SimplePing, didStartWithAddress address: NSData) {
        NSLog("pinging %@", MainViewController.displayAddressForAddress(address: address))

        self.sendPing()

        assert(self.sendTimer == nil)
        self.sendTimer = Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: #selector(MainViewController.sendPing), userInfo: nil, repeats: true)
    }

    private func simplePing(pinger: SimplePing, didFailWithError error: NSError) {
        NSLog("failed: %@", MainViewController.shortErrorFromError(error: error))

        self.stop()
    }

    private func simplePing(pinger: SimplePing, didSendPacket packet: NSData, sequenceNumber: UInt16) {
        NSLog("#%u sent", sequenceNumber)
    }

    private func simplePing(pinger: SimplePing, didFailToSendPacket packet: NSData, sequenceNumber: UInt16, error: NSError) {
        NSLog("#%u send failed: %@", sequenceNumber, MainViewController.shortErrorFromError(error: error))
    }

    private func simplePing(pinger: SimplePing, didReceivePingResponsePacket packet: NSData, sequenceNumber: UInt16) {
        NSLog("#%u received, size=%zu", sequenceNumber, packet.length)
    }

    private func simplePing(pinger: SimplePing, didReceiveUnexpectedPacket packet: NSData) {
        NSLog("unexpected packet, size=%zu", packet.length)
    }

    // MARK: utilities

    static func displayAddressForAddress(address: NSData) -> String {
        var hostStr = [Int8](repeating: 0, count: Int(NI_MAXHOST))

        let success = getnameinfo(
            address.bytes.assumingMemoryBound(to: sockaddr.self),
            //UnsafePointer(address.bytes),
            socklen_t(address.length), 
            &hostStr, 
            socklen_t(hostStr.count), 
            nil, 
            0, 
            NI_NUMERICHOST
        ) == 0
        let result: String
        if success {
            result = String(cString: hostStr)
        } else {
            result = "?"
        }
        return result
    }

    /// Returns a short error string for the supplied error.
    ///
    /// - parameter error: The error to render.
    ///
    /// - returns: A short string representing that error.

    static func shortErrorFromError(error: NSError) -> String {
        if error.domain == kCFErrorDomainCFNetwork as String && error.code == Int(CFNetworkErrors.cfHostErrorUnknown.rawValue) {
            if let failureObj = error.userInfo[kCFGetAddrInfoFailureKey] {
                if let failureNum = failureObj as? NSNumber {
                    if failureNum.intValue != 0 {
                        let f = gai_strerror(Int32(failureNum.intValue))
                        if f != nil {
                            return String(cString: f!)
                        }
                    }
                }
            }
        }
        if let result = error.localizedFailureReason {
            return result
        }
        return error.localizedDescription
    }

    // MARK: table view delegate callback

    @IBOutlet var forceIPv4Cell: UITableViewCell!
    @IBOutlet var forceIPv6Cell: UITableViewCell!
    @IBOutlet var startStopCell: UITableViewCell!

    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        let cell = self.tableView.cellForRow(at: indexPath as IndexPath)!
        switch cell {
        case forceIPv4Cell, forceIPv6Cell:
            cell.accessoryType = cell.accessoryType == .none ? .checkmark : .none
        case startStopCell:
            if self.pinger == nil {
                let forceIPv4 = self.forceIPv4Cell.accessoryType != .none
                let forceIPv6 = self.forceIPv6Cell.accessoryType != .none
                self.start(forceIPv4: forceIPv4, forceIPv6: forceIPv6)
            } else {
                self.stop()
            }
        default:
            fatalError()
        }
        self.tableView.deselectRow(at: indexPath as IndexPath, animated: true)
    }

    func pingerWillStart() {
        self.startStopCell.textLabel!.text = "Stop…"
    }

    func pingerDidStop() {
        self.startStopCell.textLabel!.text = "Start…"
    }
}

我已将其转换为Swift 4语法，但在Simulator或真实设备上无效。我点击IPv4或IPv6然后启动，但没有任何反应。

Answer 1

我从Apple下载了该项目，并亲自尝试过。您可能对表视图的didSelect事件使用了错误的方法签名。

务必更改
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath)
到
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath)
在MainViewController.swift中。

我希望这可以解决您的问题。

编辑：您还需要更改MainViewController.swift中所有委托方法的签名。例如，func simplePing(pinger: SimplePing, didFailWithError error: NSError)应该变为func simplePing(_ pinger: SimplePing, didFailWithError error: Error)。

Apples SinglePing应用程序不会调用委托方法

1 个答案: