Pie chart using Charts library with swift

Question

I am integrating pie chart in my app using Charts library and getting issue with chart data my code is

import UIKit
import Charts
class ViewController: UIViewController {
 @IBOutlet weak var pieChartView: PieChartView!
    override func viewDidLoad() {
        super.viewDidLoad()
        let months = ["Jan", "Feb", "Mar", "Apr", "May", "Jun"]
        let unitsSold = [10.0, 4.0, 6.0, 3.0, 12.0, 16.0]
        setChart(dataPoints: months, values: unitsSold)

    }


func setChart(dataPoints: [String], values: [Double]) {

var dataEntries: [ChartDataEntry] = []

for i in 0..<dataPoints.count {
    let dataEntry1 = ChartDataEntry(x: Double(i), y: values[i], data: dataPoints[i] as AnyObject)

    dataEntries.append(dataEntry1)
}
print(dataEntries[0].data)
let pieChartDataSet = PieChartDataSet(values: dataEntries, label: "Units Sold")
let pieChartData = PieChartData(dataSet: pieChartDataSet)
pieChartView.data = pieChartData

var colors: [UIColor] = []

for _ in 0..<dataPoints.count {
    let red = Double(arc4random_uniform(256))
    let green = Double(arc4random_uniform(256))
    let blue = Double(arc4random_uniform(256))

    let color = UIColor(red: CGFloat(red/255), green: CGFloat(green/255), blue: CGFloat(blue/255), alpha: 1)
    colors.append(color)
}

pieChartDataSet.colors = colors
}
}

and when run app I getting something this

but I need pie chart in full data records like in below screen shot

Answer 1

The reason all the information isn't showing up is because you are using a parent initialiser when creating the entry point.

Instead of

let dataEntry1 = ChartDataEntry(x: Double(i), y: values[i], data: dataPoints[i] as AnyObject)

try this instead

let dataEntry1 = PieChartDataEntry(value: Double(i), label: dataPoints[i], data:  dataPoints[i] as AnyObject)

The PieChartDataEntry is specifically for Pie charts so you should see the month show up in the chart.

Hopefully this gets you on the right track

Answer 2

Update for this question.

  func updateChartData()  {

    let chart = PieChartView(frame: self.view.frame)
    // 2. generate chart data entries
    let track = ["Income", "Expense", "Wallet", "Bank"]
    let money = [650, 456.13, 78.67, 856.52]

    var entries = [PieChartDataEntry]()
    for (index, value) in money.enumerated() {
        let entry = PieChartDataEntry()
        entry.y = value
        entry.label = track[index]
        entries.append( entry)
    }

    // 3. chart setup
    let set = PieChartDataSet( values: entries, label: "Pie Chart")
    // this is custom extension method. Download the code for more details.
    var colors: [UIColor] = []

    for _ in 0..<money.count {
        let red = Double(arc4random_uniform(256))
        let green = Double(arc4random_uniform(256))
        let blue = Double(arc4random_uniform(256))
        let color = UIColor(red: CGFloat(red/255), green: CGFloat(green/255), blue: CGFloat(blue/255), alpha: 1)
        colors.append(color)
    }
    set.colors = colors
    let data = PieChartData(dataSet: set)
    chart.data = data
    chart.noDataText = "No data available"
    // user interaction
    chart.isUserInteractionEnabled = true

    let d = Description()
    d.text = "iOSCharts.io"
    chart.chartDescription = d
    chart.centerText = "Pie Chart"
    chart.holeRadiusPercent = 0.2
    chart.transparentCircleColor = UIColor.clear
    self.view.addSubview(chart)

}