ios - 如何使用 AppCoda 示例和 iOS 图表获取饼图数据以显示？

Question

我一直在关注 AppCode 中创建饼图的示例。

我已经使用了他们所说的代码，但我没有得到任何数据，并且在下面的代码片段中的第二个 for 部分返回警告“我从未使用过的不可变值”颜色。

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

    var dataEntries: [ChartDataEntry] = []

    for i in 0..<dataPoints.count {
        let dataEntry = ChartDataEntry(x: values[i], y: Double(i))
        dataEntries.append(dataEntry)
    }

    let pieChartDataSet = PieChartDataSet(values: dataEntries, label: "Units Sold")
    let pieChartData = PieChartData()
    GSGCPieView.data = pieChartData

    var colors: [UIColor] = []

    for i 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

}

这是我应该加载值的代码部分:

    let months = ["Jan", "Feb", "Mar", "Apr", "May", "Jun"]
    let unitsSold = [20.0, 4.0, 6.0, 3.0, 12.0, 16.0]
    setGSGCPieChart (dataPoints: months, values: unitsSold)

我得到的在左边，我应该得到的在右边:

Answer 1

let pieChartData = PieChartData(dataSet: pieChartDataSet)