Error when setting up X & Y axis in iOS-Charts (Xcode 7.3.1)

Question

I'm very new to coding, so I'm sorry if this is a basic question. I am using iOS-Charts by Daniel Gindi (the most recent version on his Github) to set up a bar graph using the following code:

    import UIKit
    import Charts

    class BarChartViewController: UIViewController {

        var barChartView: BarChartView!
        var days: [String]!

        override func viewDidLoad() {
            super.viewDidLoad()

            days = ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"]
            let tasks = [1.0, 1.0, 1.5, 2.0, 3.0, 5.0, 0.0]

            setChart(days, values: tasks)
        }

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

            barChartView.noDataText = "You need to provide data for the chart."

            var dataEntries: [BarChartDataEntry] = Array()
            var counter = 0.0

            for i in 0..<dataPoints.count {
                counter += 1.0
                let dataEntry = BarChartDataEntry(x: values[i], y: counter)
                dataEntries.append(dataEntry)
            }

            let chartDataSet = BarChartDataSet(yVals: dataEntries, label: "Time")
            let chartData = BarChartData(xVals: days, dataSet: chartDataSet)
            barChartView.data = chartData
        }
    }

This prompts an error in func setChart:

In

    let chartDataSet = BarChartDataSet(yVals: dataEntries, label: "Time")

Incorrect argument in call (have yVals, expected values). But if you change yVals to values, it prompts an error in the next line:

    let chartData = BarChartData(xVals: days, dataSet: chartDataSet)

The error is: Cannot invoke initializer for type 'BarChartData' with an argument list of type '(xVals:[String]!, dataSet: BarChartDataSet)'

I took a look at ChartsDemo, but I'm not sure what I am exactly looking for (and I seem to be getting a compiling error when I try to build the demo).

Can someone help me out with this?

Answer 1

Try This

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

    barChartView.noDataText = "You need to provide data for the chart."

    var dataEntries: [BarChartDataEntry] = Array()
    var counter = 0.0

    for i in 0..<dataPoints.count {
        counter += 1.0
        let dataEntry = BarChartDataEntry(x: values[i], y: counter)
        dataEntries.append(dataEntry)
    }

    let chartDataSet = BarChartDataSet(values: dataEntries, label: "Time")
    let chartData = BarChartData()
    chartData.addDataSet(chartDataSet)
    barChartView.data = chartData

}

Answer 2

Try this

 let chartDataSet = BarChartDataSet(values: dataEntries, label: "Units Sold") let chartData = BarChartData() chartData.addDataSet(chartDataSet) barChart.animate(xAxisDuration: 2.0, yAxisDuration: 2.0) chartDataSet.colors = ChartColorTemplates.colorful() barChart.data = chartData 

full code

 // // ChartViewController.swift // OEE // // Created by Andrew on 07.03.2018. // Copyright © 2018 Andrew. All rights reserved. // import UIKit import Foundation import Charts class ChartViewController: UIViewController, IAxisValueFormatter, ChartViewDelegate { func stringForValue(_ value: Double, axis: AxisBase?) -> String { return months[Int(value)] } @IBOutlet weak var barChart: BarChartView! var months: [String]! override func viewDidLoad() { super.viewDidLoad() months = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"] let unitsSold = [20.0, 4.0, 6.0, 3.0, 12.0, 16.0, 4.0, 18.0, 2.0, 4.0, 5.0, 4.0] //setChart(months, values: unitsSold) missing argument label dataPoints: in call setChart(dataPoints: months, values: unitsSold) } func setChart(dataPoints: [String], values: [Double]) { barChart.noDataText = "You need to provide data for the chart." var dataEntries: [BarChartDataEntry] = [] var counter = 0.0 for i in 0..<dataPoints.count { counter += 1.0 let dataEntry = BarChartDataEntry(x: values[i], y: counter) dataEntries.append(dataEntry) } let chartDataSet = BarChartDataSet(values: dataEntries, label: "Units Sold") let chartData = BarChartData() chartData.addDataSet(chartDataSet) barChart.animate(xAxisDuration: 2.0, yAxisDuration: 2.0) chartDataSet.colors = ChartColorTemplates.colorful() barChart.data = chartData //barChart.xAxis.ent barChart.xAxis.valueFormatter = IndexAxisValueFormatter(values: months) barChart.xAxis.labelCount = months.count barChart.xAxis.labelPosition = .bottom } }