ios - 在 iOS-Charts (Xcode 7.3.1) 中设置 X 轴和 Y 轴时出错

Question

我是编码的新手，所以如果这是一个基本问题，我很抱歉。我正在使用 Daniel Gindi 的 iOS-Charts(他的 Github 上的最新版本)使用以下代码设置条形图:

    import UIKit
    import Charts

    class BarChartViewController: UIViewController {

        var barChartView: BarChartView!
        var days: [String]!

        override func viewDidLoad() {
            super.viewDidLoad()

            days = ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"]
            let tasks = [1.0, 1.0, 1.5, 2.0, 3.0, 5.0, 0.0]

            setChart(days, values: tasks)
        }

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

            barChartView.noDataText = "You need to provide data for the chart."

            var dataEntries: [BarChartDataEntry] = Array()
            var counter = 0.0

            for i in 0..<dataPoints.count {
                counter += 1.0
                let dataEntry = BarChartDataEntry(x: values[i], y: counter)
                dataEntries.append(dataEntry)
            }

            let chartDataSet = BarChartDataSet(yVals: dataEntries, label: "Time")
            let chartData = BarChartData(xVals: days, dataSet: chartDataSet)
            barChartView.data = chartData
        }
    }

这会提示 func setChart 出错:

在

    let chartDataSet = BarChartDataSet(yVals: dataEntries, label: "Time")

调用中的参数不正确(有 yVals，期望值)。但是如果把yVals改成values，会在下一行提示错误:

    let chartData = BarChartData(xVals: days, dataSet: chartDataSet)

错误是:无法使用类型为“(xVals:[String]!, dataSet: BarChartDataSet)”的参数列表为类型“BarChartData”调用初始化程序

我查看了 ChartsDemo，但我不确定我到底在寻找什么(而且我在尝试构建演示时似乎遇到了编译错误)。

有人可以帮我解决这个问题吗？

Answer 1

试试这个

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

    barChartView.noDataText = "You need to provide data for the chart."

    var dataEntries: [BarChartDataEntry] = Array()
    var counter = 0.0

    for i in 0..<dataPoints.count {
        counter += 1.0
        let dataEntry = BarChartDataEntry(x: values[i], y: counter)
        dataEntries.append(dataEntry)
    }

    let chartDataSet = BarChartDataSet(values: dataEntries, label: "Time")
    let chartData = BarChartData()
    chartData.addDataSet(chartDataSet)
    barChartView.data = chartData

}