快速使用Charts库的饼图 [英] Pie chart using Charts library with swift

问题描述

我正在使用图表库将饼图集成到我的应用程序中，并且图表数据出现问题，我的代码是

I am integrating pie chart in my app using Charts library and getting issue with chart data my code is

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

and when run app I getting something this

但是我需要完整的数据记录中的饼图，如下面的屏幕截图所示

but I need pie chart in full data records like in below screen shot

推荐答案

之所以没有显示所有信息，是因为您在创建入口点时正在使用父级初始化程序.

The reason all the information isn't showing up is because you are using a parent initialiser when creating the entry point.

代替

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

改为尝试

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

PieChartDataEntry专用于饼图，因此您应该看到图表中显示的月份.

The PieChartDataEntry is specifically for Pie charts so you should see the month show up in the chart.

希望这能使您走上正确的轨道

Hopefully this gets you on the right track

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