How to update graph data with send action button

Question

I have implemented a graph in my Dashboard but I can't change the data.

the @IBAction func euroANDm3Click is a button which should change the data according to the unit euro, but that is not working.

I have no idea why uniteuro = uniteuros is not changing the data and then updating the graph when the button is touched?

@IBAction func euroANDm3Click(_ sender: Any) {
    euroANDm3.addTarget(self, action: #selector(changeValue), for: .touchUpInside)
}


@objc func changeValue() {
    uniteuro = uniteuros
    barChart.reloadInputViews()
}


override func viewDidLayoutSubviews() {
    super.viewDidLoad()
    axisFormatDelegate = self
    
    months = ["Jan",
              "Feb",
              "Mar",
              "Apr",
              "May",
              "Jun",
              "Jul",
              "Aug",
              "Sep",
              "Oct",
              "Nov",
              "Dec"
    ]
    uniteuro = [43,34,52,39,36,33,55,39,51,45,38,44]
    
    uniteuros = [13,24,42,59,36,63,55,79,51,35,38,44]
    
    setChartforEUR(dataPoints: months, values: uniteuro)
}


func setChartforEUR(dataPoints: [String], values: [Double]) {
    barChart.noDataText = "NO DATA"
    
    var dataEntries = [BarChartDataEntry]()
    
    for i in 0..<dataPoints.count {
        let dataEntry = BarChartDataEntry(x: Double(i), y: values[i], data: dataPoints)
        
        dataEntries.append(dataEntry)
    }
    
    let chartDataSet = BarChartDataSet(entries: dataEntries, label: "EUR")
    let chartData = BarChartData(dataSet: chartDataSet)
    
    barChart.data = chartData
    barChart.xAxis.valueFormatter = axisFormatDelegate
}