ios图表不显示图表中的行/条

Question

我正在快速3.0上由Daniel Gindi工作ios-charts。我为条形图编写了以下代码

var dataEntries: [BarChartDataEntry] = []
for i in 0..<dateTime.count {
    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "MM/dd/yyyy hh:mm:ss aa"
    let dateObj = dateFormatter.date(from: dateTime[i])
    let timeIntervalForDate = dateObj!.timeIntervalSince1970
    let dataEntry = BarChartDataEntry(x: Double(timeIntervalForDate), y: Double(readings[i]))
    dataEntries.append(dataEntry)
}
let chartDataSet = BarChartDataSet(values: dataEntries, label: "Units")
let chartData = BarChartData(dataSet: chartDataSet)
self.ChartsView.data = chartData

我在模拟器中得到以下结果：

你可以看到没有红线反映我的价值观。我甚至缩放到图表但没有显示任何内容。

我还尝试了带有样本值的折线图。这是代码：

let dollars1 = [20.0, 4.0, 6.0, 3.0, 12.0, 16.0, 4.0, 18.0, 2.0, 4.0, 5.0, 4.0]
let months = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]
var yValues : [ChartDataEntry] = [ChartDataEntry]()
for i in 0 ..< months.count {
    yValues.append(ChartDataEntry(x: Double(i + 1), y: dollars1[i]))
}
let LineData = LineChartData()
let ds = LineChartDataSet(values: yValues, label: "Months")

LineData.addDataSet(ds)
self.ChartsView.data = LineData

其结果更加奇怪。此图表中未显示任何网格线。这是图像。

我不确定这些图表有什么问题。我错过了什么。到目前为止，由于大多数解决方案都在使用旧版本的图表（或者可能是我不知道的其他内容），所以我无法看到任何更为复杂的东西。请指导我正确的方向。感谢

Answer 1

我正在努力使用3.0版本和Swift 3以及缺少文档...我可以指出有关该主题的最佳文本here

Xvals作为参数消失了，而是使用轴上的二维数据

关于时间问题你可以使用＆＃34; timeIntervalSince1970＆＃34;对象的日期对象和格式

return dateFormatter.string(from: Date(timeIntervalSince1970: value))

所有这些都可以在上面提到的链接中找到

Answer 2

bug中ios-charts尝试使用时间戳索引，而不是使用时间戳或日期在x轴上显示。

// i is the index of that timestamp in data.    
let dataEntry = BarChartDataEntry(x: i, y: Double(readings[i]))

Answer 3

嘿，在iOS图表中没有禁用任何内容一切正常。这是我在我的应用程序中用于显示水平图表以及垂直图表的代码希望它对任何被困在IOS图表上的人都有帮助...与StackOverflow保持一致...享受编码：）

import UIKit

import Charts

class DashboardViewController: UIViewController, ChartViewDelegate
{
 @IBOutlet weak var barview: BarChartView!
 @IBOutlet weak var horizontalview: HorizontalBarChartView!
 var attendencelabels = [String]()
 let Present = [60.0, 60.0]
 let Absent = [20.0,40.0]
 var subjects : [String]!
 var maxUnits : Double!
 override func viewDidLoad() {
    super.viewDidLoad()
    barview.delegate = self
    barview.noDataText = "You need to provide data for the chart."
    barview.chartDescription?.text = ""
    attendencelabels.append("March")
    attendencelabels.append("April")
    subjects = ["Physics","Chemistry","Biology","English","Maths"]
    horizontalview.delegate = self
    var marks = [60.0,70.0,60.0,80.0,90.0]
    maxUnits = marks.max()
    setHorizontalChart(dataPoints: subjects, values: marks)
    //legend
    let legend = barview.legend
    legend.enabled = true
    legend.horizontalAlignment = .center
    legend.verticalAlignment = .bottom
    legend.orientation = .horizontal
    legend.drawInside = false
    legend.yOffset = 10.0;
    legend.xOffset = 10.0;
    legend.yEntrySpace = 0.0;
    let xaxis = barview.xAxis
    xaxis.valueFormatter = DefaultAxisValueFormatter.self as! IAxisValueFormatter
    xaxis.drawGridLinesEnabled = true
    xaxis.labelPosition = .top
    xaxis.centerAxisLabelsEnabled = true
    xaxis.valueFormatter = IndexAxisValueFormatter(values:self.attendencelabels)
    xaxis.granularity = 1
    let leftAxisFormatter = NumberFormatter()
    leftAxisFormatter.maximumFractionDigits = 1
    let yaxis = barview.leftAxis
    yaxis.spaceTop = 0.35
    yaxis.axisMinimum = 0
    yaxis.drawGridLinesEnabled = false
    barview.rightAxis.enabled = false
    setChart()
}

func setChart() {
    barview.noDataText = "You need to provide data for the chart."
    var dataEntries: [BarChartDataEntry] = []
    var dataEntries1: [BarChartDataEntry] = []
    for i in 0..<self.attendencelabels.count 
    {

        let dataEntry = BarChartDataEntry(x: Double(i) , y:     self.Present[i])
        dataEntries.append(dataEntry)

let dataEntry1 = BarChartDataEntry(x: Double(i) , y: self.self.Absent[i])
        dataEntries1.append(dataEntry1)

        //stack barchart
        //let dataEntry = BarChartDataEntry(x: Double(i), yValues:  [self.unitsSold[i],self.unitsBought[i]], label: "groupChart")
    }

    let chartDataSet = BarChartDataSet(values: dataEntries, label: "Working Days")
    let chartDataSet1 = BarChartDataSet(values: dataEntries1, label: "Present Days")

    let dataSets: [BarChartDataSet] = [chartDataSet,chartDataSet1]
    chartDataSet.colors = [UIColor(red: 0/255, green: 255/255, blue: 25/255, alpha: 1)]
    chartDataSet1.colors = [UIColor(red: 255/255, green: 0/255, blue: 61/255, alpha: 1)]
    //chartDataSet.colors = ChartColorTemplates.colorful()
    //let chartData = BarChartData(dataSet: chartDataSet)

    let chartData = BarChartData(dataSets: dataSets)


    let groupSpace = 0.3
    let barSpace = 0.05
    let barWidth = 0.3
    // (0.3 + 0.05) * 2 + 0.3 = 1.00 -> interval per "group"

    let groupCount = self.attendencelabels.count
    let startYear = 0


    chartData.barWidth = barWidth;
    barview.xAxis.axisMinimum = Double(startYear)
    let gg = chartData.groupWidth(groupSpace: groupSpace, barSpace: barSpace)
    print("Groupspace: \(gg)")
    barview.xAxis.axisMaximum = Double(startYear) + gg * Double(groupCount)

    chartData.groupBars(fromX: Double(startYear), groupSpace: groupSpace, barSpace: barSpace)
    //chartData.groupWidth(groupSpace: groupSpace, barSpace: barSpace)
    barview.notifyDataSetChanged()

    barview.data = chartData
    //background color
    barview.backgroundColor = UIColor.white

    //chart animation
    barview.animate(xAxisDuration: 1.5, yAxisDuration: 1.5, easingOption: .linear)

}
func setHorizontalChart(dataPoints: [String], values: [Double]) {
    horizontalview.noDataText = "You need to provide data for the chart."

    let formato: horizontalbarformatter = horizontalbarformatter()
    let xaxiss: XAxis = XAxis()
    var dataEntriesss: [BarChartDataEntry] = []
    for i in 0..<dataPoints.count {
        let dataEntryy = BarChartDataEntry(x: Double(Int(i)), y: values[i])
        dataEntriesss.append(dataEntryy)
        formato.stringForValue(Double(i), axis: xaxiss)
    }
    xaxiss.valueFormatter = formato

    let chartHorizontalDataSet = BarChartDataSet(values: dataEntriesss, label: "Marks")
    let horizontalchartData = BarChartData(dataSet: chartHorizontalDataSet)
    chartHorizontalDataSet.colors = ChartColorTemplates.colorful()

    horizontalview.xAxis.valueFormatter = xaxiss.valueFormatter
    horizontalview.data = horizontalchartData
    horizontalview.backgroundColor = UIColor.white
    horizontalview.descriptionText = ""
    horizontalview.xAxis.labelPosition = .bottom
    horizontalview.leftAxis.axisMinimum = 0
    horizontalview.leftAxis.axisMaximum = maxUnits + 1

    //barChartView.animate(xAxisDuration: 2.0, yAxisDuration: 2.0)
    horizontalview.animate(xAxisDuration: 2.0, yAxisDuration: 2.0, easingOption: .easeInBounce)

    let ll = ChartLimitLine(limit: 10.0, label: "Target")
    horizontalview.rightAxis.addLimitLine(ll)
}

func chartValueSelected(chartView: ChartViewBase, entry: ChartDataEntry, highlight: Highlight) {
    print("\(entry.y) in \(attendencelabels[Int(entry.x)])")
  }

 }