只有一個標籤出現在使用圖表創建的BarChart中

Question

我想創建一個帶有圖表庫的BarChart。除x軸上的標籤外，一切都運行良好。只有第一個標籤「Jan」出現在線上。這是我的代碼

override func viewWillAppear(_ animated: Bool) { 
     doBarChart() 
    } 

    func doBarChart(){ 


     barChartView.drawBarShadowEnabled = false 
     barChartView.drawValueAboveBarEnabled = true 
     barChartView.chartDescription?.enabled = false 

     barChartView.maxVisibleCount = 60 

     let xAxis = barChartView.xAxis 
     xAxis.axisLineColor = UIColor.black 
     xAxis.labelPosition = .bottom 
     xAxis.drawAxisLineEnabled = true 
     xAxis.drawGridLinesEnabled = false 
     xAxis.granularity = 1.0 
     xAxis.labelCount = 1 
     // xAxis.setLabelCount(7, force: true) 
     let months = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul",] 

     xAxis.valueFormatter = IndexAxisValueFormatter(values:months) 
     //Also, you probably want to add: 



     let leftAxis = barChartView.leftAxis; 
     leftAxis.enabled = false 
     leftAxis.drawAxisLineEnabled = false; 
     leftAxis.drawGridLinesEnabled = false; 
     leftAxis.axisMinimum = 0.0; // this replaces startAtZero = YES 

     let rightAxis = barChartView.rightAxis 
     rightAxis.enabled = false; 

     rightAxis.drawAxisLineEnabled = true; 
     rightAxis.drawGridLinesEnabled = false; 
     rightAxis.axisMinimum = 0.0; // this replaces startAtZero = YES 

     let l = barChartView.legend 
     l.enabled = false 

     barChartView.fitBars = true; 
     barChartView.animate(xAxisDuration: 0.2, yAxisDuration: 1.0, easingOptionX: .easeInExpo, easingOptionY: .easeInExpo) 

     setDataCount(count: 7, range: 50) 

    } 


    func setDataCount(count: Int, range: Double){ 

     let barWidth = 7.0 
     let spaceForBar = 10.0 

     var yVals = [BarChartDataEntry]() 


     yVals.append(BarChartDataEntry(x: Double(0) * spaceForBar, y: 44.5)) 
     yVals.append(BarChartDataEntry(x: Double(1) * spaceForBar, y: 78.1)) 
     yVals.append(BarChartDataEntry(x: Double(2) * spaceForBar, y: 50.3)) 
     yVals.append(BarChartDataEntry(x: Double(3) * spaceForBar, y: 56.6)) 
     yVals.append(BarChartDataEntry(x: Double(4) * spaceForBar, y: 20.5)) 
     yVals.append(BarChartDataEntry(x: Double(5) * spaceForBar, y: 44.3)) 
     yVals.append(BarChartDataEntry(x: Double(6) * spaceForBar, y: 54.4)) 

     var set1 : BarChartDataSet! 


     if let count = barChartView.data?.dataSetCount, count > 0{ 
      set1 = barChartView.data?.dataSets[0] as! BarChartDataSet 
      set1.values = yVals 
      set1.colors = [UIColor.black,UIColor.orange,UIColor.red,UIColor.green,UIColor.yellow,UIColor.blue,UIColor.gray] 
      barChartView.data?.notifyDataChanged() 
      barChartView.notifyDataSetChanged() 

     }else{ 
      set1 = BarChartDataSet(values: yVals, label: "DataSet") 
      set1.colors = [UIColor.black,UIColor.orange,UIColor.red,UIColor.green,UIColor.yellow,UIColor.blue,UIColor.gray] 


      var dataSets = [BarChartDataSet]() 
      dataSets.append(set1) 

      let data = BarChartData(dataSets: dataSets) 


      data.barWidth = barWidth; 

      barChartView.data = data 

     } 
    } 

Answer 1

Add the following delegate method of "IAxisValueFormatter" 

And assign these delegate. 

class xyz : IAxisValueFormatter{ 

weak var axisFormatDelegate: IAxisValueFormatter? 

//add these line in the func... 

func doBarChart{ 
    let xAxisValue = lineChartView.xAxis 
     xAxisValue.valueFormatter = axisFormatDelegate 
     lineChartView.xAxis.granularityEnabled = true 
     lineChartView.xAxis.granularity = 1.0 
} 

//add these method.. 

func stringForValue(_ value: Double, axis: AxisBase?) -> String { 
     return yvlaues[Int(value) % yvlaues.count] 
    } 
}