上一篇在 TwMarketTradingInfoManager 完成了拿取大盤成交量的 API，接下來，在原來的大盤 K 線頁的 Model，加上拿取大盤成交量功能的 API。命名為 func requestTwVolumeInfo()。

    var twExStockDataSet = [StockKLine]()
    
    var twExVolumeDataSet = [TwMarketTradingInfo]() //

// MARK: - 給外部呼叫的 func
    /// 會取這個月和前一個月台股加權指的 KLine data，單一個月，有可能 k 棒數量太少
    func requestTwExKLineAndVolumeInfo() {
        
        requestTwExKLineInfo()
        requestTwVolumeInfo()
    }

// MARK: - 拿大盤量
    private func requestTwVolumeInfo() {
        requestTwThisMonthVolumeInfo()
        requestTwLastMonthVolumeInfo()
    }
    
    private func requestTwThisMonthVolumeInfo() {
        
        let date = dateUtility.getStartOfMonth()
        volumeManager.requestTwMarketDailyTradingInfo(date: date) { [weak self] volumeList, error in
            
            self?.update(volumeList: volumeList)
            self?.delegate?.didRecieveVolume(volumeDataSet: volumeList, error: error)
        }
    }
    
    private func requestTwLastMonthVolumeInfo() {
        
        let date = dateUtility.getLastMonthStartDate()
        volumeManager.requestTwMarketDailyTradingInfo(date: date) { [weak self] volumeList, error in
            self?.update(volumeList: volumeList)
            self?.delegate?.didRecieveVolume(volumeDataSet: volumeList, error: error)
        }
    }
    
    private func requestTwBefore2MonthVolumeInfo() {
        
        let date = dateUtility.getMonthStartDate(date: Date(), add: -2)
        volumeManager.requestTwMarketDailyTradingInfo(date: date) { [weak self] volumeList, error in
            self?.update(volumeList: volumeList)
            self?.delegate?.didRecieveVolume(volumeDataSet: volumeList, error: error)
        }
    }

    private func update(volumeList: [TwMarketTradingInfo]) {
        
        let updatedData = Set(self.twExVolumeDataSet + volumeList)
        self.twExVolumeDataSet = Array(updatedData).sorted { $0.date.timeIntervalSince1970 < $1.date.timeIntervalSince1970 }
    }

完成後，加上 delegate func 告訴 VC 有值的變化

protocol TwStockMarketKLineModelDelegate: AnyObject {
    
    func didRecieveTaiEx(kLineDataSet: [StockKLine], error: Error?)
    func didRecieveVolume(volumeDataSet: [TwMarketTradingInfo], error: Error?)
}

TwStockMarketKLineViewController 要補上新加的 delegate func

extension TwStockMarketKLineViewController: TwStockMarketKLineModelDelegate {
    
    func didRecieveVolume(volumeDataSet: [TwMarketTradingInfo], error: Error?) {
        print(model.twExVolumeDataSet)
    }
    
    func didRecieveTaiEx(kLineDataSet: [StockKLine], error: Error?) {
        
        print(model.twExStockDataSet)
    }
}

KLineViewController 也要加上 volumnDataSet 讓外部傳入。

var volumnDataSet = [TwMarketTradingInfo]()

然後在把 KLineVC 推進來的時候，要一起把加權指數的值傳下去。

@IBAction func pushKLineButtonDidTap(_ sender: Any) {
        
        let storyboard = UIStoryboard(name: "KLine", bundle: nil)
        if let vc = storyboard.instantiateViewController(withIdentifier: "KLineViewController") as? KLineViewController {
            
            vc.kLineDataSet = model.twExStockDataSet
            vc.volumnDataSet = model.twExVolumeDataSet //前幾篇沒有這個值
            navigationController?.pushViewController(vc, animated: true)
        }
    }

然後，就可以準備在 KLineViewController 中畫上量的圖了。