swift - iOS圖表 - 在一個ViewController中使用兩個數據集的兩個LineChart視圖

我有一個應用程序，我從Firebase獲取一些數據的天數，我試圖在單獨的圖表中顯示每天的數據，使用iOS圖表，但它崩潰時出現錯誤'致命錯誤：索引超出範圍'。下面是我的代碼：swift - iOS圖表 - 在一個ViewController中使用兩個數據集的兩個LineChart視圖

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

    var dataEntries: [ChartDataEntry] = [] 

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





    let lineChartDataSet = LineChartDataSet(yVals: dataEntries, label: "Units Sold") 
    let lineChartData = LineChartData(xVals: dataPoints, dataSet: lineChartDataSet) 
    firstDayChart.data = lineChartData 

} 

func setChart2(dataPoints: [String], values: [Double]) { 

    var dataEntries: [ChartDataEntry] = [] 

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







    let lineChartDataSet = LineChartDataSet(yVals: dataEntries, label: "Units Sold") 
    let lineChartData = LineChartData(xVals: dataPoints, dataSet: lineChartDataSet) 
    secondDayChart.data = lineChartData 

}

//按鈕

@IBAction func getResults(sender: UIButton) { 
    let doubleArray = BGdataOutsideDay1.map { Double($0)!} 
    // print(doubleArray) 
    // var newArray:[Double] = [] 


    self.doublesArrayDay1 = doubleArray 

    if doublesArrayDay1.count != 0 { 
    let bgAvg = doubleArray.reduce(0, combine: +)/Double(doubleArray.count) 
    let highest = doubleArray.maxElement() 
    let lowest = doubleArray.minElement() 
    self.bgHighestDay1 = String(format: "%.1f", highest!) 
    self.bgAvgDay1 = String(format: "%.1f", bgAvg) 
    self.bgLowestDay1 = String(format: "%.1f", lowest!) 
    self.firstDayHighest.text = self.bgHighestDay1! + " " + "\(self.units!)" 
    self.firstDayAvg.text = self.bgAvgDay1! + " " + "\(self.units!)" 
    self.firstDayLowest.text = self.bgLowestDay1! + " " + "\(self.units!)" 
    } else { 
     self.firstDayHighest.text = "0" + " " + "\(self.units!)" 
     self.firstDayAvg.text = "0" + " " + "\(self.units!)" 
     self.firstDayLowest.text = "0" + " " + "\(self.units!)" 

    } 
    let doubleArray2 = BGdataOutsideDay2.map { Double($0)!} 
    // print(doubleArray) 
    // var newArray:[Double] = [] 


    self.doublesArrayDay2 = doubleArray 

    if doublesArrayDay2.count != 0 { 
     let bgAvg2 = doubleArray2.reduce(0, combine: +)/Double(doubleArray.count) 
     let highest2 = doubleArray2.maxElement() 
     let lowest2 = doubleArray2.minElement() 
     self.bgHighestDay2 = String(format: "%.1f", highest2!) 
     self.bgAvgDay2 = String(format: "%.1f", bgAvg2) 
     self.bgLowestDay2 = String(format: "%.1f", lowest2!) 
     self.secondDayHighest.text = self.bgHighestDay2! + " " + "\(self.units!)" 
     self.secondDayAvg.text = self.bgAvgDay2! + " " + "\(self.units!)" 
     self.secondDayLowest.text = self.bgLowestDay2! + " " + "\(self.units!)" 
    } else { 
     self.secondDayHighest.text = "0" + " " + "\(self.units!)" 
     self.secondDayAvg.text = "0" + " " + "\(self.units!)" 
     self.secondDayLowest.text = "0" + " " + "\(self.units!)" 
     setChart(DateOutSideDay1, values: doublesArrayDay1) 
    setChart(DateOutSideDay2, values: doublesArrayDay2) 

    }

任何幫助將不勝感激！提前致謝！ :)

來源

2017-03-07 Deyan

好像'values'數組比'dataPoints'數組少。這會解釋你遇到的錯誤。 – Laffen

是的，我知道原因，但我想讓它工作:) – Deyan

你檢查了哪個數組導致這個問題？ –

首先我覺得奇怪的是，你有一組數據點和另一組值，但它們的大小不一樣？這些集合應該是相同的大小，因爲這些值代表數據點。

Anywho ..

您可以通過let dataEntry = ChartDataEntry(value: i < values.count ? values[i] : 0, xIndex: i)

您可以定義默認值替換let dataEntry = ChartDataEntry(value: values[i], xIndex: i)解決這個問題時，有沒有可用的values數組中的索引值使用，我將它設置到0。

來源

2017-03-16 11:52:21 Laffen

非常感謝！ :) – Deyan

swift - iOS圖表 - 在一個ViewController中使用兩個數據集的兩個LineChart視圖

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