ios - 如何更新 IOS 图表中的限制线，danielgindi/Charts

Question

所以我添加了一些限制线。

func addLimitLines() {
    let stopLoss = ChartLimitLine(limit: Double(1.70) , label: "stop loss")
    stopLoss.lineWidth = 0.5
    stopLoss.lineColor = .blue
    stopLoss.lineDashLengths = [8.0]
    chartView.rightAxis.addLimitLine(stopLoss)

    let takeProfit = ChartLimitLine(limit: Double(1.68), label: "take profit")
    takeProfit.lineWidth = 0.5
    takeProfit.lineColor = .blue
    takeProfit.lineDashLengths = [8.0]
    chartView.rightAxis.addLimitLine(takeProfit)
    chartView.reloadInputViews()
}

@IBAction func stopLossChange(_ sender: UISlider) {
   //slider action for updating the stoploss limitline
}

@IBAction func takeProfitChange(_ sender: UISlider) {
   //slider action for updating the takeprofit limitline
}

现在我想在移动 slider 时更新限制线值。

Answer 1

虽然在Android Charts 版本我们有 invalidate() 刷新 chartView 但在 iOS 中我看不到它可用。在 iOS 中，我使用 animate 方法更新数据，我相信你也可以按如下方式实现这一点，

@IBAction func stopLossChange(_ sender: UISlider) {
    self.updateLineLimit(Double(sender.value), label: "stop loss")
}

@IBAction func takeProfitChange(_ sender: UISlider) {
    self.updateLineLimit(Double(sender.value), label: "take profit")
}

private func updateLineLimit(_ value: Double, label: String) {
    if let line = chartView.rightAxis.limitLines.filter({ $0.label == label }).first {
        line.limit = value
        chartView.animate(yAxisDuration: 0.00001)
    }
}