Unknown class _TtC8Material20BarLineChartViewBase in Interface Builder file - ios

Question

I have used a xib file which contains Single UIView and in that UIView i have applied the class and added 3 UIView from which one of them is BarLineChartViewBase . I have Created the outlets for them and i am using the outlets in another class which is UIViewController in which i have used ScrollView and PageControl
import UIKit
import Charts
//this is the UIView in the XIB file
class Home: UIView {
#IBOutlet weak var barGraphView: BarLineChartViewBase!
#IBOutlet weak var totalLabel: UILabel!
#IBOutlet weak var nameLabel: UILabel!
/*
// Only override draw() if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
override func draw(_ rect: CGRect) {
// Drawing code
}
*/
}
import UIKit
import Charts
class HomeViewController: UIViewController , UIScrollViewDelegate{
let featureOne = ["name":"Date-Time","graph":"BarGraph","total":"Battery Discharge"]
let featureTwo = ["name":"Time-Date","graph":"LineGraph","total":"Battery Charge"]
let featureThree = ["name":"Calender","graph":"Pie Chart","total":"Input Voltage"]
var featureArray = [Dictionary<String,String>]()
#IBOutlet weak var pageControl: UIPageControl!
#IBOutlet weak var menuButton: UIButton!
#IBOutlet weak var scrollView: UIScrollView!
var months:[String]!
var unitsSold:[Double]!
override func viewDidLoad() {
super.viewDidLoad()
months = ["Jan", "Feb", "Mar", "Apr"]
unitsSold = [20.0, 4.0, 6.0, 3.0]
menuButton.addTarget(self.revealViewController(), action: #selector(SWRevealViewController.revealToggle(_:)), for: .touchUpInside)
self.view.addGestureRecognizer(self.revealViewController().panGestureRecognizer())
featureArray = [featureOne,featureTwo,featureThree]
scrollView.contentSize = CGSize(width: self.view.bounds.width * CGFloat(featureArray.count), height: scrollView.bounds.height)
scrollView.isPagingEnabled = true
scrollView.showsHorizontalScrollIndicator = false
loadData()
Timer.scheduledTimer(timeInterval: 0.1, target: self, selector: #selector(HomeViewController.loadData), userInfo: nil, repeats: true)
scrollView.delegate = self
self.view.insertSubview(scrollView, at: 0)
// Do any additional setup after loading the view.
}
func loadData(){
for (index,feature) in featureArray.enumerated(){
if let featureView = Bundle.main.loadNibNamed("Home", owner: self, options: nil)?.first as? Home {
featureView.nameLabel.text = DateFormatter.localizedString(from: NSDate() as Date, dateStyle: DateFormatter.Style.none, timeStyle: DateFormatter.Style.medium)
featureView.barGraphView.noDataText = "No Data" //Unknown class _TtC8Material20BarLineChartViewBase in Interface Builder file.
featureView.barGraphView.data = setChart(dataPoints: months, values: unitsSold)
featureView.totalLabel.text = feature["total"]
scrollView.addSubview(featureView)
featureView.frame.size.height = scrollView.bounds.height
featureView.frame.size.width = self.view.bounds.size.width
featureView.frame.origin.x = CGFloat(index) * self.view.bounds.size.width
}
}
}
func setChart(dataPoints: [String], values: [Double]) -> BarChartData {
var dataEntries: [BarChartDataEntry] = []
for i in 0..<dataPoints.count {
// let dataEntry = BarChartDataEntry(value: values[i], xIndex: i)
let dataEntry = BarChartDataEntry(x: Double(i), y: (values[i]))
dataEntries.append(dataEntry)
}
let chartDataSet = BarChartDataSet(values: dataEntries, label: "Units Sold")
// let chartData = BarChartData(xVals: months, dataSet: chartDataSet)
let chartData = BarChartData(dataSets: [chartDataSet])
return chartData
}
func scrollViewDidScroll(_ scrollView: UIScrollView) {
let page = scrollView.contentOffset.x / scrollView.frame.size.width
pageControl.currentPage = Int(page)
}