隐藏折线图限制线。 Swift 2

Question

我正在使用图表框架 (danielgindi/Charts)。

我有一个显示 1,2 和 3 的线段。根据选择，折线图应在折线图中显示该数量的线。我有一个 switch 语句，它取决于显示该行数的段中提供的数字。例如。在案例 1 中，显示了 1 行，在案例 2 中，显示了 2 行，等等。这按预期工作。

当我尝试在此 switch 语句中添加限制线并将大写字母切换为小写字母时，例如3 到 2，第 3 行没有消失，第 1 行和第 2 行似乎有重复。

有没有办法在 switch 语句中隐藏限制线？

我有以下代码：

 func setChart(xValues: [String], valuesLineChart: [[Double]], limitLines: [Double]) {
    chartView.descriptionText = ""
    chartView.noDataText = "You need to provide data for the chart."

    print("valuesLineChart has \(valuesLineChart.count) lines")

    var dataSets : [LineChartDataSet] = [LineChartDataSet]()

    switch valuesLineChart.count {

    case 1 : print("1 within switch")

    var yVals1 : [ChartDataEntry] = [ChartDataEntry]()
    for i in 0..<xValues.count {
        yVals1.append(ChartDataEntry(value: valuesLineChart[0][i], xIndex: i))
    }

    let set1 = LineChartDataSet(yVals: yVals1, label: nil)
    dataSets.append(set1)

    //limit lines
    let limitSet1 = ChartLimitLine(limit: limitLines[0], label: "switch1, limit1")
    chartView.rightAxis.addLimitLine(limitSet1)

    case 2 :print("2 within switch")

    var yVals1 : [ChartDataEntry] = [ChartDataEntry]()
    for i in 0..<xValues.count {
        yVals1.append(ChartDataEntry(value: valuesLineChart[0][i], xIndex: i))
    }

    var yVals2 : [ChartDataEntry] = [ChartDataEntry]()
    for i in 0..<xValues.count {
        yVals2.append(ChartDataEntry(value: valuesLineChart[1][i], xIndex: i))
    }

    let set1 = LineChartDataSet(yVals: yVals1, label: nil)
    let set2 = LineChartDataSet(yVals: yVals2, label: nil)

    dataSets.append(set1)
    dataSets.append(set2)

    //limit lines
    let limitSet1 = ChartLimitLine(limit: limitLines[0], label: "")
    let limitSet2 = ChartLimitLine(limit: limitLines[1], label: "")

    chartView.rightAxis.addLimitLine(limitSet1)
    chartView.rightAxis.addLimitLine(limitSet2)


    case 3 :print("3 within switch")

    var yVals1 : [ChartDataEntry] = [ChartDataEntry]()
    for i in 0..<xValues.count {
        yVals1.append(ChartDataEntry(value: valuesLineChart[0][i], xIndex: i))
    }

    var yVals2 : [ChartDataEntry] = [ChartDataEntry]()
    for i in 0..<xValues.count {
        yVals2.append(ChartDataEntry(value: valuesLineChart[1][i], xIndex: i))
    }

    var yVals3 : [ChartDataEntry] = [ChartDataEntry]()
    for i in 0..<xValues.count {
        yVals3.append(ChartDataEntry(value: valuesLineChart[2][i], xIndex: i))
    }

    let set1 = LineChartDataSet(yVals: yVals1, label: nil)
    let set2 = LineChartDataSet(yVals: yVals2, label: nil)
    let set3 = LineChartDataSet(yVals: yVals3, label: nil)

    dataSets.append(set1)
    dataSets.append(set2)
    dataSets.append(set3)

    //limit lines
    let limitSet1 = ChartLimitLine(limit: limitLines[0], label: "")
    let limitSet2 = ChartLimitLine(limit: limitLines[1], label: "")
    let limitSet3 = ChartLimitLine(limit: limitLines[2], label: "")

    chartView.rightAxis.addLimitLine(limitSet1)
    chartView.rightAxis.addLimitLine(limitSet2)
    chartView.rightAxis.addLimitLine(limitSet3)
    }

    let data: CombinedChartData = CombinedChartData(xVals: xValues)
    data.lineData = LineChartData(xVals: xValues, dataSets: dataSets)
    chartView.data = data
}

Answer 1

我找到了解决问题的方法。当段选择不同的数字时，我回忆起导致 limitLines 重复的 setChart 函数。

为了解决这个问题，我在调用 setChart 函数之前删除了限制线；

var limitSet1 : ChartLimitLine?
var limitSet2 : ChartLimitLine?
var limitSet3 : ChartLimitLine?
var limitLineArray : [Double]

func removeLimitLines {
    switch (limitLineArray.count) {
            case 1: print("there was 1 limit line, need to remove this from chart view")
            chartView.rightAxis.removeLimitLine(limitSet1!)
            case 2: print("there was 2 limit line, need to remove this from chart view")
            chartView.rightAxis.removeLimitLine(limitSet1!)
            chartView.rightAxis.removeLimitLine(limitSet2!)
            case 3: print("there was 3 limit line, need to remove this from chart view")
            chartView.rightAxis.removeLimitLine(limitSet1!)
            chartView.rightAxis.removeLimitLine(limitSet2!)
            chartView.rightAxis.removeLimitLine(limitSet3!)
    }
}

func setChart(xValues: [String], valuesLineChart: [[Double]], limitLines: [Double]) {
chartView.descriptionText = ""
chartView.noDataText = "You need to provide data for the chart."

print("valuesLineChart has \(valuesLineChart.count) lines")

var dataSets : [LineChartDataSet] = [LineChartDataSet]()

switch valuesLineChart.count {

case 1 : print("1 within switch")

var yVals1 : [ChartDataEntry] = [ChartDataEntry]()
for i in 0..<xValues.count {
    yVals1.append(ChartDataEntry(value: valuesLineChart[0][i], xIndex: i))
}

let set1 = LineChartDataSet(yVals: yVals1, label: nil)
dataSets.append(set1)

//limit lines
limitSet1 = ChartLimitLine(limit: limitLines[0], label: "switch1, limit1")
chartView.rightAxis.addLimitLine(limitSet1)

case 2 :print("2 within switch")

var yVals1 : [ChartDataEntry] = [ChartDataEntry]()
for i in 0..<xValues.count {
    yVals1.append(ChartDataEntry(value: valuesLineChart[0][i], xIndex: i))
}

var yVals2 : [ChartDataEntry] = [ChartDataEntry]()
for i in 0..<xValues.count {
    yVals2.append(ChartDataEntry(value: valuesLineChart[1][i], xIndex: i))
}

let set1 = LineChartDataSet(yVals: yVals1, label: nil)
let set2 = LineChartDataSet(yVals: yVals2, label: nil)

dataSets.append(set1)
dataSets.append(set2)

//limit lines
limitSet1 = ChartLimitLine(limit: limitLines[0], label: "")
limitSet2 = ChartLimitLine(limit: limitLines[1], label: "")

chartView.rightAxis.addLimitLine(limitSet1)
chartView.rightAxis.addLimitLine(limitSet2)


case 3 :print("3 within switch")

var yVals1 : [ChartDataEntry] = [ChartDataEntry]()
for i in 0..<xValues.count {
    yVals1.append(ChartDataEntry(value: valuesLineChart[0][i], xIndex: i))
}

var yVals2 : [ChartDataEntry] = [ChartDataEntry]()
for i in 0..<xValues.count {
    yVals2.append(ChartDataEntry(value: valuesLineChart[1][i], xIndex: i))
}

var yVals3 : [ChartDataEntry] = [ChartDataEntry]()
for i in 0..<xValues.count {
    yVals3.append(ChartDataEntry(value: valuesLineChart[2][i], xIndex: i))
}

let set1 = LineChartDataSet(yVals: yVals1, label: nil)
let set2 = LineChartDataSet(yVals: yVals2, label: nil)
let set3 = LineChartDataSet(yVals: yVals3, label: nil)

dataSets.append(set1)
dataSets.append(set2)
dataSets.append(set3)

//limit lines
limitSet1 = ChartLimitLine(limit: limitLines[0], label: "")
limitSet2 = ChartLimitLine(limit: limitLines[1], label: "")
limitSet3 = ChartLimitLine(limit: limitLines[2], label: "")

chartView.rightAxis.addLimitLine(limitSet1)
chartView.rightAxis.addLimitLine(limitSet2)
chartView.rightAxis.addLimitLine(limitSet3)
}

let data: CombinedChartData = CombinedChartData(xVals: xValues)
data.lineData = LineChartData(xVals: xValues, dataSets: dataSets)
chartView.data = data
}

现在，我在 setChart 函数之前调用了 removeLimitLines，它按预期工作。

编辑：

您也可以直接调用：

chartView.leftAxis.removeAllLimitLines()

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