Hide Line Chart Limit Lines. Swift 2 - swift

Question

I am using the Charts frameworks (danielgindi/Charts).
I have a segment showing 1,2 & 3. Depending on the choice the line graph should display that amount of lines within a line chart.
I have a switch statement, that depending on the number provided within the segment that displays that amount of lines. E.g. within case1, 1 line is shown, case 2, 2 lines are shown etc.. & this works as expected.
When I try to add limit lines within this switch statement and switch from a higher case to a lower e.g. 3 to 2, the 3rd line doesn't disappear & line 1 and 2 seem to have duplications.
Is there anyway of hiding the limit lines within the switch statement?
I have the following code:
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

I found a solution to my problem. When the segment was selecting a different number, i was recalling the setChart function causing duplications of limitLines.
To solve this problem i removed the limit lines prior to recalling the setChart function;
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
}
Now, I call the removeLimitLines before the setChart function and it works as expected.
EDIT:
you can also just simply call:
chartView.leftAxis.removeAllLimitLines()