here are two charts. and I would like to show the data of object and object2 together in one chart.

Would it be possible?

Chart(db.objects, id: \.self) { object in
    LineMark(
        x: .value("name", object.name),
        y: .value("value", Int(object.value) ?? 0)
    )
}

Chart(db.objects2, id: \.self) { object2 in
    LineMark(
        x: .value("name", object2.name),
        y: .value("value", Int(object2.value) ?? 0)
    )
}

CodePudding user response：

I just found the way from apple developer website

The chartForegroundStyleScale is optional since each line will automatically be colored differently. But chartForegroundStyleScale can be used to customize the line colors.

CodePudding user response：

Here I am showing the data for a week. So if you want to show more than data then you can increase the number of entries. So that’s it from my side hope you understand.

Now use MultiLineChartView like this.

Complete Code:

import SwiftUI
import Charts

struct ContentView: View {
    let days = ["S", "M", "T", "W", "T", "F", "S"]
    let entries1 = [
        ChartDataEntry(x: 1, y: 1),
        ChartDataEntry(x: 2, y: 2),
        ChartDataEntry(x: 3, y: 0),
        ChartDataEntry(x: 4, y: 0),
        ChartDataEntry(x: 5, y: 0),
        ChartDataEntry(x: 6, y: 0),
        ChartDataEntry(x: 7, y: 1),
        
    ]
    let entries2 = [
        ChartDataEntry(x: 1, y: 2),
        ChartDataEntry(x: 2, y: 3),
        ChartDataEntry(x: 3, y: 0),
        ChartDataEntry(x: 4, y: 0),
        ChartDataEntry(x: 5, y: 0),
        ChartDataEntry(x: 6, y: 0),
        ChartDataEntry(x: 7, y: 2)
    ]
    var body: some View {
        VStack{
            Spacer()
            MultiLineChartView(entries1: entries1, entries2: entries2, days: days)
            .frame(height: 220)
            Spacer()
        }
    }
}

struct MultiLineChartView : UIViewRepresentable {
    
    var entries1 : [ChartDataEntry]
    var entries2 : [ChartDataEntry]
    var days: [String]
    
    func makeUIView(context: Context) -> LineChartView {
        let chart = LineChartView()
        return createChart(chart: chart)
    }
    
    func updateUIView(_ uiView: LineChartView, context: Context) {
        uiView.data = addData()
    }
    
    func createChart(chart: LineChartView) -> LineChartView{
        chart.chartDescription?.enabled = false
        chart.xAxis.drawGridLinesEnabled = false
        chart.xAxis.drawLabelsEnabled = true
        chart.xAxis.drawAxisLineEnabled = false
        chart.xAxis.labelPosition = .bottom
        chart.rightAxis.enabled = false
        chart.leftAxis.enabled = false
        chart.drawBordersEnabled = false
        chart.legend.form = .none
        chart.xAxis.labelCount = 7
        chart.xAxis.forceLabelsEnabled = true
        chart.xAxis.granularityEnabled = true
        chart.xAxis.granularity = 1
        chart.xAxis.valueFormatter = CustomChartFormatter(days: days)
        
        chart.data = addData()
        return chart
    }
    
    func addData() -> LineChartData{
        let data = LineChartData(dataSets: [
            //Schedule Trips Line
            generateLineChartDataSet(dataSetEntries: entries1, color: UIColor(Color(#colorLiteral(red: 0.6235294118, green: 0.7333333333, blue: 0.3568627451, alpha: 1))), fillColor: UIColor(Color(#colorLiteral(red: 0, green: 0.8134518862, blue: 0.9959517121, alpha: 1)))),
            //Unloadings Line
            generateLineChartDataSet(dataSetEntries: entries2, color: UIColor(Color(#colorLiteral(red: 0.003921568627, green: 0.231372549, blue: 0.431372549, alpha: 1))), fillColor: UIColor(Color(#colorLiteral(red: 0.4745098054, green: 0.8392156959, blue: 0.9764705896, alpha: 1))))
        ])
        return data
    }
    
    func generateLineChartDataSet(dataSetEntries: [ChartDataEntry], color: UIColor, fillColor: UIColor) -> LineChartDataSet{
        let dataSet = LineChartDataSet(entries: dataSetEntries, label: "")
        dataSet.colors = [color]
        dataSet.mode = .cubicBezier
        dataSet.circleRadius = 5
        dataSet.circleHoleColor = UIColor(Color(#colorLiteral(red: 0.003921568627, green: 0.231372549, blue: 0.431372549, alpha: 1)))
        dataSet.fill = Fill.fillWithColor(fillColor)
        dataSet.drawFilledEnabled = true
        dataSet.setCircleColor(UIColor.clear)
        dataSet.lineWidth = 2
        dataSet.valueTextColor = color
        dataSet.valueFont = UIFont(name: "Avenir", size: 12)!
        return dataSet
    }
    
}

class CustomChartFormatter: NSObject, IAxisValueFormatter {
    var days: [String]
    
    init(days: [String]) {
        self.days = days
    }
    
    public func stringForValue(_ value: Double, axis: AxisBase?) -> String {
        return days[Int(value-1)]
    }
}