NSNumberFormatter:大量显示'k'而不是',000'？

Question

如果可能的话,我想将我的大数字从100,000改为$ 100K.

这是我到目前为止:

let valueFormatter = NSNumberFormatter()
valueFormatter.locale = NSLocale.currentLocale()
valueFormatter.numberStyle = .CurrencyStyle
valueFormatter.maximumFractionDigits = 0

我的问题

使用NSNumberFormatter,我如何输出$ 100K而不是$ 100,000？

---

我原来的问题:

这是我到目前为止:

self.lineChartView.leftAxis.valueFormatter = NSNumberFormatter()
self.lineChartView.leftAxis.valueFormatter?.locale = NSLocale.currentLocale()
self.lineChartView.leftAxis.valueFormatter?.numberStyle = .CurrencyStyle
self.lineChartView.leftAxis.valueFormatter?.maximumFractionDigits = 0

其中翻译为:

let valueFormatter = NSNumberFormatter()
valueFormatter.locale = NSLocale.currentLocale()
valueFormatter.numberStyle = .CurrencyStyle
valueFormatter.maximumFractionDigits = 0

我的输出如下:

我的问题

使用NSNumberFormatter,我如何输出$ 100K而不是$ 100,000？

---

更新:

我想提供有关最新情况的背景,观看评论.

func setDollarsData(months: [String], range: Double) {

    var dataSets: [LineChartDataSet] = [LineChartDataSet]()

    var yVals: [ChartDataEntry] = [ChartDataEntry]()
    for var i = 0; i < months.count; i++ {
        // I'm adding my values here in value:, value takes a Double
        yVals.append(ChartDataEntry(value: county[userFavs[0]]![i], xIndex: i))
    }

    let set1: LineChartDataSet = LineChartDataSet(yVals: yVals, label: self.userFavs[0])
    set1.axisDependency = .Left
                set1.setColor(UIColor.redColor().colorWithAlphaComponent(0.5))
     set1.setCircleColor(UIColor.redColor())
     set1.lineWidth = 2.0
     set1.circleRadius = 6.0
     set1.fillAlpha = 65 / 255.0

     dataSets.append(set1)

    let data: LineChartData = LineChartData(xVals: months, dataSets: dataSets)
    data.setValueTextColor(UIColor.whiteColor())

    // this is where I set the number formatter
    self.lineChartView.gridBackgroundColor = UIColor.darkGrayColor()
    self.lineChartView.leftAxis.startAtZeroEnabled = false
    self.lineChartView.leftAxis.valueFormatter = NSNumberFormatter()
    self.lineChartView.leftAxis.valueFormatter?.locale = NSLocale.currentLocale()
    self.lineChartView.leftAxis.valueFormatter?.numberStyle = .CurrencyStyle
    self.lineChartView.leftAxis.valueFormatter?.maximumFractionDigits = 0

    // set it to the chart // END OF THE LINE
    self.lineChartView.data = data // outputs to my chart

    }

正如您所看到的,一旦我将数字转储到yVals中,我就失去了对它们的访问权限,因此这些扩展只有在我入侵框架时才能工作.

Answer 1

编辑/更新

Swift 3或更高版本

extension FloatingPoint {
    var kFormatted: String {
        return String(format: self >= 1000 ? "$%.0fK" : "$%.0f", (self >= 1000 ? self/1000 : self) as! CVarArg )
    }
}

您可以像这样使用它来格式化您的输出:

10.0.kFormatted     // "$10"
100.0.kFormatted    // "$100"
1000.0.kFormatted   // "$1K"
10000.0.kFormatted  // "$10K"
162000.0.kFormatted  // "$162K"
153000.0.kFormatted  // "$153K"
144000.0.kFormatted  // "$144K"
135000.0.kFormatted  // "$135K"
126000.0.kFormatted  // "$126K"

Answer 2

我遇到了同样的问题并通过实现自定义格式化程序解决了它。刚刚开始用 Swift 编码，所以代码可能不是最惯用的。

open class KNumberFormatter : NumberFormatter {
    override open func string(for obj: Any?) -> String? {
        if let num = obj as? NSNumber {
            let suffixes = ["", "k", "M", "B"]
            var idx = 0
            var d = num.doubleValue
            while idx < 4 && abs(d) >= 1000.0 {
                d /= 1000.0
                idx += 1
            }
            var currencyCode = ""
            if self.currencySymbol != nil {
                currencyCode = self.currencySymbol!
            }

            let numStr = String(format: "%.1f", d)

            return currencyCode + numStr + suffixes[idx]
        }
        return nil
    }
}