ios - .noDataText 未在图表内更新。 swift 2

Question

我正在使用图表库 (danielgindi/Charts)。

我有一个显示天、周、月和年选项的段。根据选择的内容将显示在图表上。

我有以下代码:

var highestValue : Double = 0.0
@IBAction func segmentChanged(sender: AnyObject) {
    switch durationSegment.selectedSegmentIndex
    {
    case 0:
        segmentSelected = "Day"
        highestValue = 8.0
    case 1:
        segmentSelected = "Week"
        highestValue = 10.0
    case 2:
        segmentSelected = "Month"
        highestValue = 12.0
    case 3:
        segmentSelected = "Year"
        highestValue = 14.0
    default:
        break;
    }

    print("segment selected = \(segmentSelected)")
    displayDurationLabel(segmentSelected, providedStartDate : NSDate())

}


 func setChart(xValues: [String], valuesCandleChart: [Double], durationToBeDisplayed: String) {
    chartView.descriptionText = ""
    print("within setChart, durationToBeDisplayed = \(durationToBeDisplayed)")
    chartView.noDataText = "No spends logged for \(durationToBeDisplayed)" 
chartView.leftAxis.customAxisMax = highestValue
}

当最初调用 ViewController 时，它使用 segmentSelected = "Month"并且图表显示正确的消息，但是当我更改段时，例如“Day”，打印显示正确的输出，但“.noDataText”未按预期更新。

任何帮助将不胜感激:)

Answer 1

调用candleChartView.setNeedsDisplay() 将重绘图表并更新文本