如何在 ios-chart 上隐藏 0 值？

Question

我知道可以在 MPAndroidChart 上使用自定义 class 为您的值格式化程序 () 隐藏 y 值时它们的值等于 0。

尽管如此，我无法在 Swift 3.0 上创建相同的 class 或通过任何其他方式来执行此操作。我尝试 "translate" 自定义 class 从 Java 到 Swift 3.0 但没有成功（如果你愿意，我可以复制我尝试过的代码，但它充满了错误） .

是否可以隐藏 ios-chart 库中等于 0 的 y 值？

P.S: 我正在使用 Swift 3.0.

提前致谢！

Answer 1

我就是这样在我的一个应用程序的 PieChart 上实现的：

    ...
    let dataSet = PieChartDataSet(yVals: yVals, label: nil)

    // This is where the magic happen
    // You set a NSNumberFormatter with an empty zero Symbol
    let noZeroFormatter = NumberFormatter()
    noZeroFormatter.zeroSymbol = ""
    dataSet.valueFormatter = ChartDefaultValueFormatter(formatter: noZeroFormatter)

    let chartData = PieChartData(xVals: xVals, dataSet: dataSet)
    ...

Answer 2

如果您想在图表中添加 % 以及图表中的 hide/remove 0.0 值：

used below lines of code for # Swift 3:-

   func updateChartData()  {

        let chart = PieChartView(frame: mViewOutlet.frame)
//         let chart = PieChartView(frame: CGRect(x: 122, y: 235 , width: self.mViewOutlet.frame.size.width, height: self.mViewOutlet.frame.size.height))


        // 2. generate chart data entries
        let track = ["Present","Leave", "EG/LC", "Halfday", "Absent", "Weeklyoff", "Holidays"]
        //        let money = [65, 13, 10, 2]
        let money = mDaysArray

        var entries = [PieChartDataEntry]()
        for (index, value) in money.enumerated() {
            print("index: \(index) \n value: \(value)")
            let entry = PieChartDataEntry()

            if value != 0 {
                 entry.y = Double(value)
            }else{

            }
            entries.append(entry)
//            entry.label = track[index]  // if we want to remove name label
        }

        // 3. chart setup
        let set = PieChartDataSet( values: entries, label: "Pie Chart")
        // this is custom extension method. Download the code for more details.

        //4. set chart color
        let presentColor = UIColor(red: 80.0/255.0, green: 180.0/255.0, blue: 50.0/255.0, alpha: 1.0)
        //        let lateColor = UIColor(red: 241.0/255.0, green: 194.0/255.0, blue: 114.0/255.0, alpha: 1.0)
        let leaveColor = UIColor(red: 203.0/255.0, green: 68.0/255.0, blue: 242.0/255.0, alpha: 1.0)
        let egColor = UIColor(red: 95.0/255.0, green: 180.0/255.0, blue: 239.0/255.0, alpha: 1.0)
        let halfdayColor = UIColor(red: 82.0/255.0, green: 64.0/255.0, blue: 152.0/255.0, alpha: 1.0)
        let absentColor = UIColor(red: 242.0/255.0, green: 58.0/255.0, blue: 02.0/255.0, alpha: 1.0)
        let weekOffColor = UIColor(red: 186.0/255.0, green: 221.0/255.0, blue: 79.0/255.0, alpha: 1.0)
        let holidayColor = UIColor(red: 35.0/255.0, green: 215.0/255.0, blue: 179.0/255.0, alpha: 1.0)

        let colors: [UIColor] = [presentColor,leaveColor,egColor,halfdayColor,absentColor,weekOffColor,holidayColor]

        set.colors = colors
        let data = PieChartData(dataSet: set)

        let formatter = NumberFormatter()
        formatter.numberStyle = .percent
        formatter.maximumFractionDigits = 2
        formatter.multiplier = 1.0
        formatter.percentSymbol = "%"
        formatter.zeroSymbol = ""
        data.setValueFormatter(DefaultValueFormatter(formatter: formatter))

        chart.data = data
        chart.noDataText = "No data available"
         chart.usePercentValuesEnabled = true
        // user interaction
        chart.isUserInteractionEnabled = false

        let d = Description()
//        d.text = "iOSCharts.io"
        chart.chartDescription = d
//        chart.tintColor = UIColor.black
//        chart.centerText = "Pie Chart"

        chart.holeRadiusPercent = 0.2
        chart.chartDescription?.enabled = false
        chart.legend.enabled = false

        chart.data?.notifyDataChanged()
        chart.notifyDataSetChanged()
        chart.setNeedsDisplay()
        chart.animate(xAxisDuration: 1.3, yAxisDuration: 1.3)

        chart.transparentCircleColor = UIColor.clear
//        self.view.addSubview(chart)
        self.mPieChartMainView.addSubview(chart)
    }

Answer 3

  let data = PieChartData(dataSet: set)

    let pFormatter = NumberFormatter()
    pFormatter.numberStyle = .none
    pFormatter.zeroSymbol = "";
    pFormatter.maximumFractionDigits = 1
    pFormatter.multiplier = 1
    pFormatter.percentSymbol = ""
    data.setValueFormatter(DefaultValueFormatter(formatter: pFormatter))

如何在 ios-chart 上隐藏 0 值？

How can I hide 0 values on ios-chart?

ios

swift

ios-charts