饼图使用图表库与iOS swift 3

概述我想在 Github上使用piechart danielgindi / Charts库. 我的代码是这样的： import UIKitimport Chartsclass ChartViewController: UIViewController { @IBOutlet weak var pieChartView: PieChartView! override func 我想在 Github上使用pIEchart danIElgindi / Charts库.
我的代码是这样的：

import UIKitimport Chartsclass ChartVIEwController: UIVIEwController {    @IBOutlet weak var pIEChartVIEw: PIEChartVIEw!    overrIDe func vIEwDIDLoad() {        super.vIEwDIDLoad()    // Do any additional setup after loading the vIEw.        let months = ["Jan","Feb","Mar","Apr","May","Jun"]        let unitsSold = [20.0,4.0,6.0,3.0,12.0,16.0]        setChart(dataPoints: months,values: unitsSold)    }    func setChart(dataPoints: [String],values: [Double]) {        var dataEntrIEs: [ChartDataEntry] = []        for i in 0..<dataPoints.count {            let dataEntry1 = PIEChartDataEntry(value: Double(i),label: dataPoints[i],data:  dataPoints[i] as AnyObject)            dataEntrIEs.append(dataEntry1)        }        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    }}

但是当我运行它时,请分解这一行：

pIEChartVIEw.data = pIEChartData

我没有在任何图表库之前使用,但是我必须使用一个项目.这个图书馆或其他图书馆对我来说无关紧要.如果您知道回答我的问题,请帮助我解决.或者您可以告诉我另一个与switf 3兼容的库.谢谢.

解决方法 我以编程方式初始化了pIEChartVIEw并将其添加到子视图中.代码运行正常,不会崩溃.我做了必要的更改并在下面添加了它：

import UIKitimport Chartsclass ChartVIEwController: UIVIEwController {   var pIEChartVIEw: PIEChartVIEw!   overrIDe func vIEwDIDLoad() {       super.vIEwDIDLoad()       // Do any additional setup after loading the vIEw.       let months = ["Jan","Jun"]       let unitsSold = [20.0,16.0]       pIEChartVIEw = PIEChartVIEw(frame: self.vIEw.bounds)       self.vIEw.addSubvIEw(pIEChartVIEw!)       setChart(dataPoints: months,values: unitsSold)   }   func setChart(dataPoints: [String],values: [Double]) {       var dataEntrIEs: [ChartDataEntry] = []       for i in 0..<dataPoints.count {           let dataEntry1 = PIEChartDataEntry(value: values[i],label: dataPoints[i])           dataEntrIEs.append(dataEntry1)       }       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),Alpha: 1)           colors.append(color)       }       pIEChartDataSet.colors = colors   }}

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