如何在iOS圖表4.0.3的X軸上添加字串？

在 ios Charts (4.0.3) 的最后更新中，我一直在嘗試在 xAxis 上實作自定義標簽。

有這個代碼：

 // some model inside with parsed JSON, this is working well.
var dataRad = [DataModel]()
 var dataEntries = [BarChartDataEntry]()
            
            
            for item in dataRad {
                guard let level = Double(item.level!), let id = Double(item.id!) else { return }
                let dataEntry = BarChartDataEntry(x: id, y: level)
                //   labels.append(item.temp!)
                dataEntries.append(dataEntry)
                
            }

// some setup of the Charts, e.g. colors etc.

let xAxis = chartsView.xAxis
            xAxis.labelFont = UIFont(name:"Play-Bold", size:10)!
            xAxis.labelPosition = .bottom
          
            xAxis.labelCount = self.dataRad.count
            xAxis.drawLabelsEnabled = true
            let labels: [String] = ["1, 2", "2, 2", "3, 3", "4, 4", "5, 5", "6, 6", "7, 7", "8, 8", "9, 9", "10, 10"]
    
            xAxis.valueFormatter = IndexAxisValueFormatter(values: labels)

此代碼不起作用。我在 xAxis 上看不到標簽。但是如果我洗掉這個格式化程式，我會看到我的“id”變數的默認值（在“for in”回圈中）。

我嘗試了一些技巧，例如擴展，添加。帶格式化程式的類。沒有什么對我有用...

請幫助使用標簽解決此問題。謝謝！

uj5u.com熱心網友回復：

這是我當前的圖表設定

        let labelFont = UIFont.SFProText(style: .bold, ofSize: 12)
        let lineWidth = CGFloat(1)

        // Setup style for X axis
        barChartView.xAxis.axisLineWidth = lineWidth
        barChartView.xAxis.labelFont = labelFont
        barChartView.xAxis.labelTextColor = .white
        barChartView.xAxis.axisLineColor = .white
        
        barChartView.xAxis.labelPosition = .bottom

        barChartView.xAxis.drawAxisLineEnabled = true
        barChartView.xAxis.drawLabelsEnabled = true
        barChartView.xAxis.drawGridLinesEnabled = false

        barChartView.xAxis.spaceMax = 0
        barChartView.xAxis.spaceMin = 0
        barChartView.xAxis.decimals = 0
        barChartView.xAxis.granularity = 1
        barChartView.xAxis.granularityEnabled = true
        barChartView.xAxis.labelFont = labelFont
        barChartView.xAxis.axisLineColor = .white
        barChartView.xAxis.labelTextColor = .white

然后你可以試試我的CustomIndexAxisFormatter：

class CustomIndexAxisFormatter: NSObject, AxisValueFormatter {
    private var _values: [(Double, String)] = [(Double, String)]()
    private var _valueCount: Int = 0
    
    public var values: [(Double, String)] {
        get {
            return _values
        }
        set {
            _values = newValue
            _valueCount = _values.count
        }
    }
    
    public override init(){
        super.init()
    }
    
    public init(values: [(Double, String)]) {
        super.init()
        self.values = values
    }
    
    public static func with(values: [(Double, String)]) -> CustomIndexAxisFormatter? {
        return CustomIndexAxisFormatter(values: values)
    }
    
    func stringForValue(_ value: Double, axis: AxisBase?) -> String {
        if let firstIndex = self.values.firstIndex(where: { $0.0 == value }) {
            return _values[firstIndex].1
        }
        if value <= 1000 && values.indices.contains(Int(value)) {
            return _values[Int(value)].1
        } else {
            guard let axis = axis else {
                return ""
            }

            let count = Double(self._valueCount)
            let diff = value - axis.axisMinimum
            let range = axis.axisRange
            let step = range / (count - 1)
            let index = Int(round(diff / step))
            guard values.indices.contains(index) else { return "" }
            return _values[index].1
        }
    }
}

然后當你制作資料集時：

        let labels: [String] = ["1, 2", "2, 2", "3, 3", "4, 4", "5, 5", "6, 6", "7, 7", "8, 8", "9, 9", "10, 10"]
        var arrayXLabel: [(Double, String)] = []
        for (index, item) in entries.enumerated() {
            if index < labels.count - 1 {
                // need to use item.x as Double value of Array label
                // because we will need to link label with chart point properly
                arrayXLabel.append((item.x, labels[index]))
            }
        }
        barChartView.xAxis.valueFormatter = CustomIndexAxisFormatter(values: arrayXLabel ))

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