iOS 图表 - 需要将 X 轴标签除以 12

如何解决iOS 图表 - 需要将 X 轴标签除以 12

我正在尝试编辑贷款支付图表中的 x 轴标签，以显示年数而不是月数。它目前以月数显示，因为这些值是从 0 到 360 的 for 循环生成的（每个月持续 30 年）。请参阅我目前拥有的附件图片，红色是我想要的样子。

我确信这里有一个明显的解决方案，我只是对 swift 和一般编码比较陌生。

My Loan Pay Off Chart

生成图表的代码如下：

    var balanceEntries = [ChartDataEntry]()
    var valueEntries = [ChartDataEntry]()
    var equityEntries = [ChartDataEntry]()
    let purchase = purchaseprice
    let dp = downpayment
    var balance = purchase - dp
    var value = arv + (arv * propertyAppreciation)/12
    
    for per in stride(from: 0,to: 360,by: +1) {
        let pmt = payment
        let rate = interestRate
        let purchase = purchaseprice
        let dp = downpayment
        let loan = purchase - dp
        
        var years = [Double]()
        
        let ipmt = pmt + pow(1+rate,Double(per)-1)*((loan)*(rate)-pmt)
        let ppmt = payment - ipmt
        balance -= ppmt
        value += (value*propertyAppreciation)/12
        let equity = value - balance
        
        if balance > 0 {
        balanceEntries.append(ChartDataEntry(x: Double(per),y: Double(balance)))
        }
        else {
            balanceEntries.append(ChartDataEntry(x: Double(per),y: Double(0)))
        }
       
        valueEntries.append(ChartDataEntry(x: Double(per),y: Double(value)))
        
        if equity < value {
            equityEntries.append(ChartDataEntry(x: Double(per),y: Double(equity)))
        }
        else {
            equityEntries.append(ChartDataEntry(x: Double(per),y: Double(value)))
        }
                    
    }
    
    let set1 = LineChartDataSet(entries: balanceEntries,label: "Loan Balance")
    let set2 = LineChartDataSet(entries: valueEntries,label: "Property Value")
    let set3 = LineChartDataSet(entries: equityEntries,label: "Equity")
    let data2 = LineChartData(dataSets: [set1,set2,set3])