Why my LineChartDataSet's line is behind the bar?

[zip520123]

I follow the demo code "Combined Chart".
There is my "LineChartDataSet" setting below.

set1 = LineChartDataSet(values: yVals, label: "")
set1?.lineDashLengths = [1 ,0]
set1?.lineWidth = 1.0
set1?.circleRadius = 4.0
set1?.drawCircleHoleEnabled = false
set1?.formSize = 15.0
set1?.setColors(UIColor.red)
set1?.setCircleColor(UIColor.red)
set1?.mode = .stepped
set1?.drawValuesEnabled = false

and BarChartDataSet setting.

set1 = BarChartDataSet(values: yVals, label: "")
set1?.setColors(UIColor(red: 0.071, green: 0.459, blue: 0.835, alpha: 1.00))
set1?.drawValuesEnabled = false

How can I bring LineChartDataSet's line to front?

[thierryH91200]

set1
let dataLine = LineChartData()
.... what you want...
dataLine.addDataSet(set1)

set2 = BarChartDataSet(values: yVals, label: "")
... what you want ..
let dataBar = BarChartData()
dataBar.addDataSet(set2)

and

let data = CombinedChartData()
data.lineData = dataLine
data.barData = dataBar

[zip520123]

My fault.
I fix it by change

chartView.drawOrder = [DrawOrder.line.rawValue ,DrawOrder.bar.rawValue ]

to

chartView.drawOrder = [DrawOrder.bar.rawValue ,DrawOrder.line.rawValue ]

Sorry, my poor english that you can't understand my question...😂