3

我正在使用ios-charts在我的视图控制器中绘制图表。我在视图中有 3 个图表，我想根据第一个图表的值选择显示第二个图表，并且我想按顺序显示基于第二个图表的值选择的第三个图表。

由于图表值选择方法，基于第一个图表的值选择显示第二个图表很容易，即

func chartValueSelected(chartView: ChartViewBase, entry: ChartDataEntry, dataSetIndex: Int, highlight: ChartHighlight) {
}

我无法对第二到第三张图表使用相同的方法。我需要帮助来解决这个问题。我正在尝试显示从第一个图表中选择值的第二个图表。

// A delegate method from data model
func dataDidLoad(controller: DataModel) {
        var chartArray:[PFObject] = [PFObject]()

        let formatter = NSDateFormatter()
        formatter.dateFormat = "MMM"
        dataDict = [:]
        for element in chartArray {
            let data = od["Data1"] as! String

            if self.dataDict.indexForKey(data) != nil {
                self.dataDict[value]! += 1.0
            }else{
                self.dateDict.updateValue(1.0, forKey: data1.desc)
            }
        }
        let dataPointArray = Array(dataDict.keys)
        let valuesArray = Array(dataDict.values)
        pieChartView.data = nil
        setChart1(dataPointArray, values: valuesArray)
    }

// This method sets the first chart and working fine
func setChart(dataPoints: [String], values: [Double]) {
    var dataEntries: [ChartDataEntry] = []
    var label = ""
    for i in 0..<dataPoints.count {

        let dataEntry = ChartDataEntry(value: values[i], xIndex: i)
        dataEntries.append(dataEntry)
        label += "\(dataPoints[i]) "
    }

    let pieChartDataSet = PieChartDataSet(yVals: dataEntries, label: label)
    let pieChartData = PieChartData(xVals: dataPoints, dataSet: pieChartDataSet)
    pieChartView.data = pieChartData
    pieChartView.animate(xAxisDuration: NSTimeInterval(5))
    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  
}

// This menthod is the delegate method from ios chart liberary. And gets triggered when any data selected from chart1
func chartValueSelected(chartView: ChartViewBase, entry: ChartDataEntry, dataSetIndex: Int, highlight: ChartHighlight) {

    data2Dict = [:]
    for element in chart2Array {
        let data2 = od["Data2"] as! String

        if self.data2Dict.indexForKey(data2) != nil {
            self.data2Dict[data2]! += 1.0
        }else{
            self.data2Dict.updateValue(1.0, forKey: data2)
        }
    }

    let valuesArray = Array(data2Dict.values)
    let dPointArray = Array(data2Dict.keys)
    setChart2(dPointArray, values: valuesArray)
}

// This method sets the 2nd chart and working fine
func setChart2(dataPoints: [String], values: [Double]) {
    var dataEntries: [ChartDataEntry] = []
    var label = ""
    for i in 0..<dataPoints.count {

        let dataEntry = ChartDataEntry(value: values[i], xIndex: i)
        dataEntries.append(dataEntry)
        label += "\(dataPoints[i]) "
    }

    let pieChartDataSet = PieChartDataSet(yVals: dataEntries, label: label)
    let pieChartData = PieChartData(xVals: dataPoints, dataSet: pieChartDataSet)
    pieChartView.data = pieChartData
    pieChartView.animate(xAxisDuration: NSTimeInterval(5))
    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  
}

由于数据是动态的，并且第二张和第三张图表的变化是基于从上一张图表中选择的数据，我不能使用相同的事件同时触发第二张和第三张图表。

4

0 回答 0