iOS Charts -> Last value doesn't appear - ios

Question

I have some troubles with the library, when I create a barChart I have to add an extra value to my values array in order to show all my original values, and in the lineChart the last value appears in the line graph but it doesn't have its value above the point like the others.
I let you my code and some pictures showing the problem:
BarChart: My xAxis have a custom format showing months.
override func viewDidLoad() {
super.viewDidLoad()
let unitsSold = [20.0, 4.0, 6.0, 3.0, 12.0, 16.0, 4.0, 18.0, 2.0, 4.0, 5.0, 4.0]
max = unitsSold.maxElement()
setChart(unitsSold)
}
func setChart(values: [Double]) {
let formato:BarChartFormatter = BarChartFormatter()
let xaxis:XAxis = XAxis()
barChartView.noDataText = "You need to provide data for the chart."
var dataEntries: [BarChartDataEntry] = []
for i in 0..<values.count {
let dataEntry = BarChartDataEntry(x: Double(i), y:values[i])
dataEntries.append(dataEntry)
formato.stringForValue(Double(i), axis: xaxis)
}
xaxis.valueFormatter = formato
let chartDataSet = BarChartDataSet(values: dataEntries, label: "Units Sold")
chartDataSet.colors = ChartColorTemplates.joyful()
barChartView.fitBars = true //Para que las barras inicial y final se muestren completas
barChartView.xAxis.valueFormatter = xaxis.valueFormatter
barChartView.xAxis.labelPosition = .Bottom
barChartView.leftAxis.axisMinimum = 0
barChartView.leftAxis.axisMaximum = max + 2
barChartView.rightAxis.enabled = false
barChartView.drawValueAboveBarEnabled = false
barChartView.descriptionText = ""
barChartView.xAxis.drawGridLinesEnabled = false
barChartView.animate(xAxisDuration: 1.0, yAxisDuration: 1.0)
let chartData = BarChartData()
chartData.addDataSet(chartDataSet)
barChartView.data = chartData
}
LineChart: My xAxis have a custom format showing months.
override func viewDidLoad() {
super.viewDidLoad()
let unitsSold = [20.0, 4.0, 6.0, 3.0, 12.0, 16.0]
max = unitsSold.maxElement()
setChart(unitsSold)
}
func setChart(values: [Double]) {
let formato:BarChartFormatter = BarChartFormatter()
let xaxis:XAxis = XAxis()
var dataEntries: [ChartDataEntry] = []
for i in 0..<values.count {
let dataEntry = ChartDataEntry(x: Double(i), y: values[i])
dataEntries.append(dataEntry)
formato.stringForValue(Double(i), axis: xaxis)
}
xaxis.valueFormatter = formato
let lineChartDataSet = LineChartDataSet(values: dataEntries, label: "Units Sold")
lineChartDataSet.colors = ChartColorTemplates.joyful()
lineChartDataSet.circleColors = ChartColorTemplates.joyful()
lineChartDataSet.drawCircleHoleEnabled = false
let lineChartData = LineChartData( dataSet: lineChartDataSet)
lineChartData.setValueFont(UIFont(name: "HelveticaNeue-Light", size: 7))
lineChartView.fitScreen()
lineChartView.xAxis.labelPosition = .Bottom
lineChartView.xAxis.axisMaximum = Double(values.count)
lineChartView.leftAxis.axisMinimum = 0
lineChartView.leftAxis.axisMaximum = max + 3
lineChartView.rightAxis.enabled = false
lineChartView.descriptionText = ""
lineChartView.xAxis.drawGridLinesEnabled = false
lineChartView.animate(xAxisDuration: 1.0, yAxisDuration: 1.0)
lineChartView.xAxis.valueFormatter = xaxis.valueFormatter
lineChartView.data = lineChartData
}
The responses are: For barChart December doesn't appear and in lineChart the last value doesn't show its value above it, I hope someone can help.