饼图使用图表库与swift 3

Question

我正在使用图表库在我的应用程序中集成饼图,并且我的代码是图表数据的问题

import UIKit
import Charts
class ViewController: UIViewController {
 @IBOutlet weak var pieChartView: PieChartView!
    override func viewDidLoad() {
        super.viewDidLoad()
        let months = ["Jan", "Feb", "Mar", "Apr", "May", "Jun"]
        let unitsSold = [10.0, 4.0, 6.0, 3.0, 12.0, 16.0]
        setChart(dataPoints: months, values: unitsSold)

    }


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

var dataEntries: [ChartDataEntry] = []

for i in 0..<dataPoints.count {
    let dataEntry1 = ChartDataEntry(x: Double(i), y: values[i], data: dataPoints[i] as AnyObject)

    dataEntries.append(dataEntry1)
}
print(dataEntries[0].data)
let pieChartDataSet = PieChartDataSet(values: dataEntries, label: "Units Sold")
let pieChartData = PieChartData(dataSet: pieChartDataSet)
pieChartView.data = pieChartData

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
}
}

当运行应用程序时,我得到了一些东西

但我需要完整数据记录中的饼图,如下面的屏幕截图

Answer 1

此问题的更新.

  func updateChartData()  {

    let chart = PieChartView(frame: self.view.frame)
    // 2. generate chart data entries
    let track = ["Income", "Expense", "Wallet", "Bank"]
    let money = [650, 456.13, 78.67, 856.52]

    var entries = [PieChartDataEntry]()
    for (index, value) in money.enumerated() {
        let entry = PieChartDataEntry()
        entry.y = value
        entry.label = track[index]
        entries.append( entry)
    }

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

    for _ in 0..<money.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)
    }
    set.colors = colors
    let data = PieChartData(dataSet: set)
    chart.data = data
    chart.noDataText = "No data available"
    // user interaction
    chart.isUserInteractionEnabled = true

    let d = Description()
    d.text = "iOSCharts.io"
    chart.chartDescription = d
    chart.centerText = "Pie Chart"
    chart.holeRadiusPercent = 0.2
    chart.transparentCircleColor = UIColor.clear
    self.view.addSubview(chart)

}

Answer 2

所有信息未显示的原因是因为您在创建入口点时使用父初始化程序.

代替

let dataEntry1 = ChartDataEntry(x: Double(i), y: values[i], data: dataPoints[i] as AnyObject)

试试这个

let dataEntry1 = PieChartDataEntry(value: Double(i), label: dataPoints[i], data:  dataPoints[i] as AnyObject)

PieChartDataEntry专门用于饼图,因此您应该看到月份显示在图表中.

希望这能让你走上正轨