D19 - 用 Swift 和公开资讯，打造投资理财的 Apps { 移动平均线(MA线)实作.2 }

MAUtility 既然已经完成，那就可以在 ChartsAdapter 中处理 [StockKLine] 时候呼叫即可。

private func get5MALineData(stockSticks: [StockKLine]) -> LineChartData {
        
        var lineDataEntry = [ChartDataEntry]()
        
        let maPoints = maUtiltiy.get5MAPoints(from: stockSticks)
        
        for point in maPoints {
            let dataEntry = ChartDataEntry(x: point.x, y: point.y)
            lineDataEntry.append(dataEntry)
        }
        
        // maPoints 得到了
        let maDataSet = LineChartDataSet(entries: lineDataEntry, label: "5 MA")
        maDataSet.setColor(.systemBlue)
        maDataSet.lineWidth = 1
        maDataSet.drawCirclesEnabled = false
        maDataSet.drawValuesEnabled = false
        maDataSet.axisDependency = .left
        maDataSet.highlightEnabled = true
        
        let maData = LineChartData(dataSet: maDataSet)
        
        return maData
    }

整个 ChartsAdapter 中，处理 CombinedChart 的部分如下

// MARK: - Combine Charts 相关 func
extension ChartsAdapter {
    
    private var maUtiltiy: MovingAverageUtility {
        return MovingAverageUtility()
    }
    
    func getCombineChartView() -> UIView {
        let view = CombinedChartView()
        setupCombinedChartView(view)
        return view
    }
    
    func updateWithMALine(stockSticks: [StockKLine], combinedView: UIView) {
        
        if let combinedView = combinedView as? CombinedChartView {
            
            let maData = get5MALineData(stockSticks: stockSticks)
            let candleData = getCandleData(stockSticks: stockSticks)
            
            let combinedData = CombinedChartData()
            combinedData.lineData = maData
            combinedData.candleData = candleData
            
            combinedView.data = combinedData
            
            // 这边有优化空间，请读者自行优化
            let candleDataEntry = convert(stockStick: stockSticks)
            let dataSet = convert(dataEntry: candleDataEntry)
            updateMaxMin(combinedView, dataSet: dataSet)
            
            let indexDateLabels = getIndexDateLabels(from: stockSticks)
            updateXAxis(combinedView, indexDateLabels: indexDateLabels)
        }
    }
    
    private func get5MALineData(stockSticks: [StockKLine]) -> LineChartData {
        
        var lineDataEntry = [ChartDataEntry]()
        
        let maPoints = maUtiltiy.get5MAPoints(from: stockSticks)
        
        for point in maPoints {
            let dataEntry = ChartDataEntry(x: point.x, y: point.y)
            lineDataEntry.append(dataEntry)
        }
        
        // maPoints 得到了
        let maDataSet = LineChartDataSet(entries: lineDataEntry, label: "5 MA")
        maDataSet.setColor(.systemBlue)
        maDataSet.lineWidth = 1
        maDataSet.drawCirclesEnabled = false
        maDataSet.drawValuesEnabled = false
        maDataSet.axisDependency = .left
        maDataSet.highlightEnabled = true
        
        let maData = LineChartData(dataSet: maDataSet)
        
        return maData
    }
    
    private func getCandleData(stockSticks: [StockKLine]) -> CandleChartData {
        
        let candleDataEntry = convert(stockStick: stockSticks)
        let candleDataSet = convert(dataEntry: candleDataEntry)
        let candleData = convert(dataSet: candleDataSet)
        return candleData
    }
    
    private func setupCombinedChartView(_ chartView: CombinedChartView) {
        
        chartView.dragEnabled = false
        chartView.setScaleEnabled(true)
        chartView.maxVisibleCount = 1000
        chartView.pinchZoomEnabled = true
        
        chartView.legend.horizontalAlignment = .right
        chartView.legend.verticalAlignment = .top
        chartView.legend.orientation = .vertical
        chartView.legend.drawInside = false
        chartView.legend.font = UIFont.systemFont(ofSize: 10)
        
        chartView.leftAxis.labelFont = UIFont.systemFont(ofSize: 10)
        chartView.leftAxis.spaceTop = 0.3
        chartView.leftAxis.spaceBottom = 0.3
        chartView.leftAxis.axisMinimum = 0
        
        chartView.rightAxis.enabled = false
        
        chartView.xAxis.labelPosition = .bottom
        chartView.xAxis.labelFont = UIFont.systemFont(ofSize: 10)
        chartView.xAxis.labelCount = 10
    }
}

那这时候 VC 只要换掉原来 CandleChartView 的那一行呼叫即可

在 KLineViewController 中，换掉 chartView 即可

private lazy var chartView: UIView = {
        let view = chartsAdapter.getCombineChartView()
        return view
    }()

完成後 VC 画面看起来像这样

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IT铁人赛Demo App

下方是这次 D1 ~ D12 的完成品，可以下载来试
App Store - 台股申购日历