How do I draw Bar-Chart using danielgindi/Charts library with Swift 3.0 - swift

Question

Problem Statement : Unable to run due to some errors in implementation of Bar-Chart using 'danielgindi/Charts library' in swift 3.0 syntax errors.
Actual Error in Swift 3.0:
After correcting above error, it gives another error in next line, as shown below.
Coding Stuff:
import Charts
class ChartViewController: UIViewController {
#IBOutlet var barChartView: BarChartView!
var months: [String]!
var dataEntries: [BarChartDataEntry] = []
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(dataPoints: months, values: unitsSold)
}
func setChart(dataPoints: [String], values: [Double]) {
barChartView.noDataText = "You need to provide data for the chart."
for i in 0..<dataPoints.count {
let dataEntry = BarChartDataEntry(x: Double(i), yValues: [values[i]])
dataEntries.append(dataEntry)
}
let chartDataSet = BarChartDataSet(values: dataEntries, label: "Units Sold")
let chartData = BarChartData(xVals: months, dataSet: chartDataSet)
barChartView.data = chartData
}
Please help me, how do I resolve such errors in swift 3.0

Answer 1

I've had this issue as well. It was this line here:
let dataEntry = BarChartDataEntry(x: Double(i), yValues: [values[i]])
You cannot convert dataPoints: [String] to type Double.
My solution was to remove the Double. Then that did not satisfy my data types, so I made them all of type [Int] like so:
func setChart(dataPoints: [Int], values: [Int]) {
self.noDataText = "You need to provide data for the chart."
var dataEntries: [BarChartDataEntry] = []
for i in 0..<dataPoints.count {
let dataEntry = BarChartDataEntry(x: Double(i), y: Double(values[i]) )
dataEntries.append(dataEntry)
}
let chartDataSet = BarChartDataSet(values: dataEntries, label: "Units Sold")
let chartData = BarChartData(dataSet: chartDataSet)
self.data = chartData
You can convert [Int] to Double, so that fixed my issue. I changed the variable months: [String] to
let months = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]

Answer 2

import UIKit
import Charts
class ViewController: UIViewController, ChartViewDelegate {
#IBOutlet weak var barChartView: BarChartView!
weak var axisFormatDelegate: IAxisValueFormatter?
var months: [String]!
var unitsSold = [Double]()
override func viewDidLoad() {
super.viewDidLoad()
barChartView.delegate = self
axisFormatDelegate = self
months = ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"]
unitsSold = [20.0, 54.0, 6.0, 30.0, 92.0, 16.0,114.0]
setChart(dataPoints: months, values: unitsSold)
}
func setChart(dataPoints: [String], values: [Double]) {
barChartView.noDataText = "You need to provide data for the chart."
// Prevent from setting an empty data set to the chart (crashes)
guard dataPoints.count > 0 else { return }
var dataEntries = [BarChartDataEntry]()
for i in 0..<dataPoints.count {
let entry = BarChartDataEntry(x: Double(i), y: values[i], data: months as AnyObject?)
dataEntries.append(entry)
}
let chartDataSet = BarChartDataSet(entries: dataEntries, label: "Units Sold")
chartDataSet.drawValuesEnabled = false
chartDataSet.colors = [UIColor.red]
chartDataSet.colors = [UIColor.lightGray]
chartDataSet.highlightColor = UIColor.orange.withAlphaComponent(0.3)
chartDataSet.highlightAlpha = 1
let chartData = BarChartData(dataSet: chartDataSet)
barChartView.data = chartData
let xAxisValue = barChartView.xAxis
xAxisValue.valueFormatter = axisFormatDelegate
// chartDataSet.colors = ChartColorTemplates.colorful() //multiple colors
//Animation bars
barChartView.animate(xAxisDuration: 0.0, yAxisDuration: 1.0, easingOption: .easeInCubic)
// X axis configurations
barChartView.xAxis.granularityEnabled = true
barChartView.xAxis.granularity = 1
barChartView.xAxis.drawAxisLineEnabled = true
barChartView.xAxis.drawGridLinesEnabled = false
barChartView.xAxis.labelFont = UIFont.systemFont(ofSize: 15.0)
barChartView.xAxis.labelTextColor = UIColor.black
barChartView.xAxis.labelPosition = .bottom
// Right axis configurations
barChartView.rightAxis.drawAxisLineEnabled = false
barChartView.rightAxis.drawGridLinesEnabled = false
barChartView.rightAxis.drawLabelsEnabled = false
// Other configurations
barChartView.highlightPerDragEnabled = false
barChartView.chartDescription?.text = ""
barChartView.legend.enabled = false
barChartView.pinchZoomEnabled = false
barChartView.doubleTapToZoomEnabled = false
barChartView.scaleYEnabled = false
barChartView.drawMarkers = true
let l = barChartView.legend
l.horizontalAlignment = .left
l.verticalAlignment = .bottom
l.orientation = .horizontal
l.drawInside = false
l.form = .circle
l.formSize = 9
l.font = UIFont(name: "HelveticaNeue-Light", size: 11)!
l.xEntrySpace = 4
// On tapped bar marker before adding BalloonMarker.swift
let marker = BalloonMarker(color: UIColor.orange, font: UIFont.boldSystemFont(ofSize: 13), textColor: UIColor.white, insets: UIEdgeInsets(top: 7.0, left: 7.0, bottom: 15.0, right: 7.0))
marker.chartView = barChartView
barChartView.marker = marker
}
}
extension ViewController: IAxisValueFormatter {
func stringForValue(_ value: Double, axis: AxisBase?) -> String {
return months[Int(value)]
}
}
Install pod file
Assign barchartview class to chart view in storyboad
Follow setchart() method
For ballon marker add BallonMarker.swift file to your project library for this file chartsDemo->Components-> BallonMarker.swift
I have implemented a demo for that
This will Support Swift 4.2 and above
Check this link :
https://github.com/vijay1864/Barchart-Demo-with-Charts-Library
This Demo was Made with help of danielgindi Charts Library
https://github.com/danielgindi/Charts

Answer 3

You can iterate month and units sold values as xVal and yVal.
var barChartValues: [BarChartDataEntry] = []
for (key,val) in self.barChartDataval.enumerated() {
let xVal = Double(key)
let yVal = Double(val.cost)
let dataEntry = BarChartDataEntry(x: xVal, y: yVal!)
barChartValues.append(dataEntry)
}
let chartDataSet = BarChartDataSet(values: barChartValues, label: "Expenses Summary")
chartDataSet.colors = [Constants.k_COLORS.BLUE]
var dataSets = [IChartDataSet]()
dataSets.append(chartDataSet)
let chartData = BarChartData(dataSets: dataSets)
self.barChartView.data = chartData
self.barChartView.chartDescription?.text = ""
self.barChartView.animate(xAxisDuration: 2.0, yAxisDuration: 2.0, easingOption: .easeInBounce)

Answer 4

For Line chart We can have following
import UIKit
import Charts
class LineChartVC: UIViewController , ChartViewDelegate{
#IBOutlet var lineChartView: LineChartView!
var months: [String]!
override func viewDidLoad() {
super.viewDidLoad()
self.lineChartSetUp()
}
}
extension LineChartVC{
func lineChartSetUp(){
self.lineChartView.delegate = self
self.lineChartView.chartDescription?.enabled = false//true
self.lineChartView.dragEnabled = true
self.lineChartView.setScaleEnabled(true)
self.lineChartView.pinchZoomEnabled = true
self.lineChartView.drawGridBackgroundEnabled = false
// x-axis limit line
/*
let llXAxis = ChartLimitLine(limit: 10.0, label: "Index 10")
llXAxis.lineWidth = 4.0
llXAxis.lineDashLengths = [(10.0), (10.0), (0.0)]
llXAxis.labelPosition = ChartLimitLine.LabelPosition.rightBottom//ChartLimitLabelPositionRightBottom
llXAxis.valueFont = UIFont.systemFont(ofSize: 10.0)
//[_chartView.xAxis addLimitLine:llXAxis];
self.lineChartView.xAxis.gridLineDashLengths = [10.0, 10.0]
self.lineChartView.xAxis.gridLineDashPhase = 0.0
let ll1 = ChartLimitLine(limit: 150.0, label: "Upper Limit")
ll1.lineWidth = 4.0
ll1.lineDashLengths = [5.0, 5.0]
ll1.labelPosition = ChartLimitLine.LabelPosition.rightTop //ChartLimitLabelPositionRightTop
ll1.valueFont = UIFont.systemFont(ofSize: 10.0)
let ll2 = ChartLimitLine(limit: -30.0, label: "Lower Limit")
ll2.lineWidth = 4.0
ll2.lineDashLengths = [5.0, 5.0]
ll2.labelPosition = ChartLimitLine.LabelPosition.rightBottom//ChartLimitLabelPositionRightBottom
ll2.valueFont = UIFont.systemFont(ofSize: 10.0)
let leftAxis: YAxis? = self.lineChartView.leftAxis
leftAxis?.removeAllLimitLines()
// leftAxis?.addLimitLine(ll1)
// leftAxis?.addLimitLine(ll2)
// leftAxis?.axisMaximum = 200.0
// leftAxis?.axisMinimum = -50.0
// leftAxis?.axisMaximum = 100.0
// leftAxis?.axisMinimum = 0.0
//
leftAxis?.gridLineDashLengths = [5.0, 5.0]
leftAxis?.drawZeroLineEnabled = false
leftAxis?.drawLimitLinesBehindDataEnabled = true
self.lineChartView.rightAxis.enabled = false
//[_chartView.viewPortHandler setMaximumScaleY: 2.f];
//[_chartView.viewPortHandler setMaximumScaleX: 2.f];
*/
let marker = BalloonMarker(color: UIColor(white: 180 / 255.0, alpha: 1.0), font: UIFont.systemFont(ofSize: 12.0), textColor: UIColor.white, insets: UIEdgeInsetsMake(8.0, 8.0, 20.0, 8.0))
marker.chartView = self.lineChartView
marker.minimumSize = CGSize(width: 80.0, height: 40.0)
self.lineChartView.marker = marker
self.lineChartView.legend.form = Legend.Form(rawValue: 5)!
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]
self.setChart(months, values: unitsSold)
}
func setChart(_ dataPoints: [String], values: [Double]) {
var dataEntries: [ChartDataEntry] = []
for i in 0..<dataPoints.count {
let dataEntry = ChartDataEntry(x:Double(i) , y: values[i])
dataEntries.append(dataEntry)
}
print(dataEntries )
let data = LineChartData()
let ds1 = LineChartDataSet(values: dataEntries, label: "Units Sold")
ds1.colors = [UIColor.red]
data.addDataSet(ds1)
self.lineChartView.data = data
}
func chartValueSelected(chartView: ChartViewBase, entry: ChartDataEntry, dataSetIndex: Int, highlight: Highlight) {
// print("\(entry.value) in \(months[dataSetIndex])")
print(entry )
}
}