通过主机数组ping并在表中显示结果

我正在尝试ping包含不同主机的数组。在每个循环中,我都会根据ping是否成功保存一个图像(checkImg,errorImg)。之后,我想在一个表中显示信息(主机名和img)。

线程1:致命错误:行中的索引超出范围:imgServer.image文件= UIImage(名称:statusImagesMain)[索引.row])

所以我想不同主机的ping循环之前没有完成serverStatusTable.reloadData文件()已执行。

你知道我能做些什么来克服这个问题吗?

import UIKit

class ServerVC: SimplePingDelegate, UITableViewDelegate, UITableViewDataSource {

    @IBOutlet weak var serverStatusTable: UITableView!

    let imageError = UIImage(named: "error")
    let imageCheck = UIImage(named: "check")

    var pings = ["www.apple.com", "www.appleidontknowwhy.de", "www.apple.com", "www.apple.com"]

    var hosts = [String]() // hostnames which get pinged
    var componentTextArray = [String]() // project names
    var statusImagesTemporary = [String]() // temporary store images
    var statusImagesMain = [String]() // array filled with temporary stored images
    var serverStatusMain = [String]() // server status string (connected, error)
    var serverStatusTemporary = [String]() // temporary server status

    override func viewDidLoad() {
        super.viewDidLoad()

        serverStatusTable.dataSource = self
        serverStatusTable.delegate = self

        statusImagesMain = ["error", "error", "error", "error"]
        componentTextArray = ["Project 1", "Project 2", "Project 3", "Project 4"]
        serverStatusMain = ["no data", "no data", "no data", "no data"]
        hosts = pings

        pingNext()
        serverStatusTable.reloadData()
        }

    override func viewDidAppear(_ animated: Bool) {
    // initial ping host process when loading the view
        startHostRequest()
    }

    @IBAction func refreshBtnAction(_ sender: Any) {
    // manual ping host process when clicking the button "refresh"
        startHostRequest()
    }


    func startHostRequest () {
        print("refresh server status")
        pingNext()
        // clear array before each host ping process in order for the array to keep only four items
        statusImagesMain.removeAll()
        serverStatusMain.removeAll()

        for statusImageTemporary in statusImagesTemporary {
            statusImagesMain.append(statusImageTemporary)
        }
        for i in serverStatusTemporary {
            serverStatusMain.append(i)
        }
        serverStatusTable.reloadData()
    }

    func pingNext() {
        guard pings.count > 0 else {
            return
        }
        let ping = pings.removeFirst()
        PlainPing.ping(ping, withTimeout: 1.0, completionBlock: { (timeElapsed:Double?, error:Error?) in
            if let latency = timeElapsed {
                print("\(ping) latency (ms): \(latency)")
                // fill temporary arrays with img and serverStatus text for successful connection
                self.statusImagesTemporary.append("check")
                self.serverStatusTemporary.append("Running ")
            }
            if let error = error {
                print("error: \(error.localizedDescription)")
                // fill temporary arrays with img and serverStatus text for failed connection attempt
                self.statusImagesTemporary.append("error")
                self.serverStatusTemporary.append("Error ")
            }
            self.pingNext()
        })
    }

// fill table with host data

    func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return componentTextArray.count
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = serverStatusTable.dequeueReusableCell(withIdentifier: "serverStatusCell", for: indexPath)

        let lblServerStatus : UILabel = cell.contentView.viewWithTag(8) as! UILabel
        let imgServer : UIImageView = cell.contentView.viewWithTag(7) as! UIImageView


        imgServer.image = UIImage(named: statusImagesMain[indexPath.row])
        lblServerStatus.text = serverStatusMain[indexPath.row]

        return cell
    }
}