Swift does not draw chart (XYPieChart) - swift

Question

I am using the XYPieChart library in order to draw a pie chart in my project but it doesn't draw the chart when I run it in the simulator. I tried it in a UITableViewController class but did not get result switched to UIViewController but got same results.
What am I doing wrong in here ?
import Foundation
import XYPieChart
class MainVC:UIViewController,XYPieChartDelegate,XYPieChartDataSource{
let z = Share.sharedInstance
let dbm = DatabaseManager()
var chart_dNameArr = [""]
var chart_dAmountArr = [0.0]
override func viewDidLoad() {
self.view.addGestureRecognizer(self.revealViewController().panGestureRecognizer())
makeChart()
}
func makeChart(){
let pieChart = XYPieChart()
let viewWidth: Float = Float(pieChart.bounds.size.width / 2)
let viewHeight: Float = Float(pieChart.bounds.size.height / 2)
pieChart.delegate = self
pieChart.dataSource = self
pieChart.startPieAngle = CGFloat(M_PI_2)
pieChart.animationSpeed = 1.5
pieChart.labelColor = UIColor.whiteColor()
pieChart.labelShadowColor = UIColor.blackColor()
pieChart.showPercentage = true
pieChart.backgroundColor = UIColor.whiteColor()
//To make the chart at the center of view
pieChart.pieCenter = CGPointMake(pieChart.bounds.origin.x + CGFloat(viewWidth), pieChart.bounds.origin.y + CGFloat(viewHeight))
//Method to display the pie chart with values.
pieChart.reloadData()
print("made a chart")
}
func numberOfSlicesInPieChart(pieChart: XYPieChart!) -> UInt {
return 2
}
func pieChart(pieChart: XYPieChart!, valueForSliceAtIndex index: UInt) -> CGFloat {
var value: CGFloat = 0.0
if index % 2 == 0 {
value = 25
}
else {
value = 75
}
return value
}
func pieChart(pieChart: XYPieChart!, colorForSliceAtIndex index: UInt) -> UIColor! {
var color: UIColor
if index % 2 == 0 {
color = UIColor.redColor()
}
else {
color = UIColor.greenColor()
}
return color
}
}

Answer 1

I think you did not add the piechart to the view
func makeChart(){
//....
pieChart.reloadData()
addSubView(pieChart) //<- Add this line
}