如何遍历Swift数组并在iOS图表中使用数据？

我有一个条形图，我试图通过从数组中提取的数据来填充该条形图。

我试图遍历此数组以填充我的图表。

请注意：在下面的示例中，有3个winningStreakDM变量被硬编码用于测试目的，但是在“现实生活”中，每个API调用的数量可能会有所不同，这取决于该联盟中有多少“用户”。

这就是为什么我需要遍历数组并构造适合的数据的原因。

    let winningStreakDM1 : [String : Any] = [
        "id" : 2,
        "user_name" : "Dicky",
        "winning_streak" : 5
    ]

    let winningStreakDM2 : [String : Any] = [
        "id" : 6,
        "user_name" : "G",
        "winning_streak" : 2
    ]

    let winningStreakDM3 : [String : Any] = [
        "id" : 5,
        "user_name" : "Sultan",
        "winning_streak" : 0
    ]

我的问题是，我不知道如何遍历初始数组来构造数据以使其与上述代码一起使用。

这是我的完整脚本：

import UIKit
import Charts

class CommunityLeagueStatsVC: UIViewController {


// GRAPHS *********

@IBOutlet weak var chartView: BarChartView!
var values = [BarChartDataEntry]()

// ****************
//********CHART VARIABLES**************//

//WINS LOSSES DRAWS
var winStreak: Double = 0.0

@IBOutlet weak var leagueStatsScrollView: UIScrollView!

var noDefeats: Bool?
var noWins: Bool?
var biggestWin: String?
var biggestWinTeams: String?

var passedCommunityName: String?
@IBOutlet weak var communityName: UILabel!

var playerId2: String?
var communityId2: String?
var eMail2: String?

override func viewDidLoad() {
    super.viewDidLoad()


    let winningStreak =  ["Wins"]
    let gamesWon = [winStreak]
    setWinStreakChart(dataPoints: winningStreak, values: gamesWon)

    let defaults = UserDefaults.standard
    let Email = defaults.string(forKey: "userEmail")
    let playerId = defaults.string(forKey: "playerId")
    let commsId = defaults.string(forKey: "communityId")

    self.playerId2 = playerId
    self.communityId2 = commsId
    self.eMail2 = Email


}

 func setWinStreakChart(dataPoints: [String], values: [BarChartDataEntry]){

    xAxis.valueFormatter = WinningStreakFormatter(chartView: self.chartView)
    let barChartDataSet = BarChartDataSet(values: values, label: "Winning Streak")
    barChartDataSet.colors = ChartColorTemplates.material()

    let barChartData = BarChartData(dataSet: barChartDataSet)
    barChartData.setValueFont(UIFont.systemFont(ofSize: 12.0))
    self.chartView.data = barChartData
}


override func viewDidAppear(_ animated: Bool) {

    let myUrl = URL(string: "http://www.xxx.uk/xxx/getLeagueStats.php")
    var request = URLRequest(url:myUrl!)
    request.httpMethod = "POST"

    let postString = "player_id=\(self.playerId2!)&community_id=\(communityId2!)";

    request.httpBody = postString.data(using: String.Encoding.utf8);
    let task = URLSession.shared.dataTask(with: request) { (data: Data?, response: URLResponse?, error: Error?) in
        DispatchQueue.main.async
            {
                do{

                    let json = try JSONSerialization.jsonObject(with: data!, options: .allowFragments) as? [String:AnyObject]
                    print (json!)

                       if let dict = json?["leagueStats"] as? [String:AnyObject] {

                          //WINNING STREAK

                        var values = [BarChartDataEntry]()

                        if let dataWinStreak = dict["winningStreak"] as? [[String : Any]] {
                            print ("test one")
                            for (index,item) in dataWinStreak.enumerated() {
                                if let yValue = item["winning_streak"] as? Int, let userName = item["user_name"] as? String {
                                    print ("test two")
                                    let barChartDataEntry = BarChartDataEntry(x: Double(index), y: Double(yValue), data: userName as AnyObject?)
                                    values.append(barChartDataEntry)

                                }
                            }

                            self.setWinStreakChart(dataPoints: ["wins"], values: values)
                        }
        catch{
            print(error)
                }
        }
        }
    task.resume()

}
}

更新：

这些是我目前收到的错误：

经过一些试验并注释掉了包含第一个错误的行，我到了这个阶段，该阶段可以正确显示带有值的图形，但是没有xAxis包含每个玩家的用户名。