如果值为0％，如何从图表中删除标签

如何解决如果值为0％，如何从图表中删除标签

我正在使用iOS图显示此图像 我知道值来自标签，但我需要从图表中隐藏零标签，但不能从下面的description.I中尝试将标签上的内容传递为空，但这不会使其动态。 我想要的是 ->如果为零，则不应在饼图上生成标签

func pieChartUpdate () {
    //future home of pie chart code
    
    HalfPieChartView.delegate = self
    
    HalfPieChartView.holeColor = .white
    HalfPieChartView.transparentCircleColor = NSUIColor.white.withAlphaComponent(0.43)
    HalfPieChartView.holeRadiusPercent = 0.58
    HalfPieChartView.rotationEnabled = false
    HalfPieChartView.highlightPerTapEnabled = true
    
    HalfPieChartView.maxAngle = 180 // Half chart
    HalfPieChartView.rotationAngle = 180 // Rotate to make the half on the upper side
    HalfPieChartView.centerTextOffset = CGPoint(x: 0,y: -20)
    
    
    let entry1 = PieChartDataEntry(value: Double(pieProdPer),label: "Productive")
    let entry2 = PieChartDataEntry(value: Double(pieUnProdPer),label: "Unproductive")
    let entry3 = PieChartDataEntry(value: Double(pieNeutralPer),label: "Neutral")
    let dataSet = PieChartDataSet(entries: [entry1,entry2,entry3],label: "")

    dataSet.sliceSpace = 3
    dataSet.selectionShift = 5
    let prodcolor = NSUIColor(red: 72/255.0,green: 195/255.0,blue: 252/255.0,alpha: 1.0)
    let unprodcolor = NSUIColor(red: 255/255.0,green: 125/255.0,blue: 139/255.0,alpha: 1.0)
    let neutralcolor = NSUIColor(red: 228/255.0,green: 228/255.0,blue: 228/255.0,alpha: 1.0)
    
    dataSet.colors = [prodcolor,unprodcolor,neutralcolor]
    
    let data = PieChartData(dataSet: dataSet)
    let pFormatter = NumberFormatter()
    pFormatter.numberStyle = .percent
    pFormatter.maximumFractionDigits = 1
    pFormatter.multiplier = 1
    pFormatter.percentSymbol = " %"
    //using zeroSymbol i can remove number from chart
    pFormatter.zeroSymbol = ""
    data.setValueFormatter(DefaultValueFormatter(formatter: pFormatter))

    data.setValueFont(NSFont(name: "Open Sans",size: 11)!)
    data.setValueTextColor(.white)

    HalfPieChartView.data = data
    HalfPieChartView.chartDescription?.text = ""

    //All other additions to this function will go here

    //This must stay at end of function
    HalfPieChartView.notifyDataSetChanged()
   
}

半圆形饼图

解决方法

您可以尝试使用@JoakimDanielson的注释，例如，如果值为0，则不将条目添加到dataSet中。您可以检查带有静态数据数组的示例

代码：

import UIKit
import Charts

class PieViewController: UIViewController {
    
    @IBOutlet weak var pieChartView: PieChartView!
    
    override func viewDidLoad() {
        super.viewDidLoad()

        let months = ["Jan","Feb","Mar","Apr","May","Jun"]
        let unitSold = [6.0,8.0,26.0,0.0,10.0]
        setChart(dataPoints: months,values: unitSold.map{ Double($0) })
    }

    func setChart(dataPoints: [String],values: [Double]) {
        
      //Set ChartDataEntry
      var dataEntries: [ChartDataEntry] = []
      for i in 0..<dataPoints.count {
        
        //if value is 0 not adding to array of dataEntries
        if values[i] != 0 {
            
            let dataEntry = PieChartDataEntry(value: values[i],label: dataPoints[i],data: dataPoints[i] as AnyObject)
            dataEntries.append(dataEntry)
        }
        
      }
        
      //Set ChartDataSet
      let pieChartDataSet = PieChartDataSet(entries: dataEntries,label: nil)
      pieChartDataSet.colors = colorsOfCharts(numbersOfColor: dataPoints.count)
        
      //Set ChartData
      let pieChartData = PieChartData(dataSet: pieChartDataSet)
      let format = NumberFormatter()
      format.numberStyle = .none
      let formatter = DefaultValueFormatter(formatter: format)
      pieChartData.setValueFormatter(formatter)
        
      //Assign it to the chart’s data
      pieChartView.data = pieChartData

    }

    //colors for entries of the dataSet
    func colorsOfCharts(numbersOfColor: Int) -> [UIColor] {
        var colors: [UIColor] = []
        for _ in 0..<numbersOfColor {
            let red = Double(arc4random_uniform(256))
            let green = Double(arc4random_uniform(256))
            let blue = Double(arc4random_uniform(256))
            let color = UIColor(red: CGFloat(red/255),green: CGFloat(green/255),blue: CGFloat(blue/255),alpha: 1)
            colors.append(color)
        }
        return colors
    }

}

输出：