如何在 swift(IOS 图表) 中使用 daniel gindi/Chart 库在饼图中显示百分比符号

Question

我正在使用 Charts 框架（由 Daniel gindi 设计）。它工作正常但是如何在饼图上显示 %（符号）？
我也在尝试使用 NSNumberFormatter() 方法来获取百分比中的隐蔽数据值，但没有得到 % 符号。
我在这里上传代码

    @IBOutlet var pieChart: PieChartView!
    override func viewDidLoad() {
            super.viewDidLoad()
            var data = [25.0,37.5,12.5,12.5,12.5] // pie chart data 
            var status = ["A","B","C","D","E"] // status
            setChart(status, values: data)
            self.pieChart.drawSliceTextEnabled = false

    }
    func setChart(dataPoints: [String], values: [Double]) {

            pieChart.noDataText = "you need to provide data for chart"
            pieChart.noDataTextDescription = ""
            self.pieChart.descriptionText = ""

            var dataEntries: [ChartDataEntry] = []
            //pieChart.centerText = " "
            for i in 0..<dataPoints.count {

                let dataEntry = ChartDataEntry(value: values[i], xIndex: i)
                dataEntries.append(dataEntry)

            }

            let pieChartDataSet = PieChartDataSet(yVals: dataEntries, label: "")

            var colors: [UIColor] = []


            for _ in 0..<dataPoints.count {
                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)

                pieChartDataSet.colors = colors

            }

            let pieChartData = PieChartData(xVals: dataPoints, dataSet: pieChartDataSet)

            pieChart.data = pieChartData
            pieChart.animate(yAxisDuration: 2.0, easingOption: .EaseInOutBack)
}

输出：=>

Answer 1

在饼图上显示 % 符号。

Download Example Project

只需使用下面的代码。

let formatter = NSNumberFormatter()
formatter.numberStyle = .PercentStyle
formatter.maximumFractionDigits = 1
formatter.multiplier = 1.0
pieChartData.dataSet?.valueFormatter = formatter

您的值显示在切片上后，您将获得 % 符号。

来源 https://github.com/danielgindi/Charts

Answer 2

只需添加这些行来格式化 PieChart 中的百分比。

     let formatter = NSNumberFormatter()
                        formatter.numberStyle = .PercentStyle
                        formatter.maximumFractionDigits = 1
                        formatter.multiplier = 1.0
                        pieChartData.setValueFormatter(formatter)
// text color of percentage label
    slcCell.pieChartView.data?.setValueTextColor(UIColor.clearColor())

Answer 3

在 Swift3 和最新版本的 charts 上，您可以对饼图进行 % 格式化，如下所示：

    let formatter = NumberFormatter()
    formatter.numberStyle = .percent
    formatter.maximumFractionDigits = 1
    formatter.multiplier = 1.0
    pieChartData.setValueFormatter(DefaultValueFormatter(formatter:formatter))

Answer 4

    let formatter = NumberFormatter()
    formatter.numberStyle = .percent
    formatter.maximumFractionDigits = 1
    formatter.multiplier = 1.0
    chart.data?.setValueFormatter(formatter as? IValueFormatter)

如何在 swift(IOS 图表) 中使用 daniel gindi/Chart 库在饼图中显示百分比符号

How to show Percentage sign in pie chart using daniel gindi/Chart library in swift(IOS Chart)

ios

swift

pie-chart

输出：=>