SwiftYFinanceで株価を取得してチャートに表示してみる

struct StockChartData{
    var date: Date?
    var volume: Int?
    var open: Float?
    var close: Float?
    var adjclose: Float?
    var low: Float?
    var high: Float?
}

import SwiftUI
import SwiftYFinance
import Charts

struct StockData: Identifiable {
    var id = UUID()
    var date: Date
    var value: Float
}

struct ContentView: View {
    @State private var stockData: [StockData] = []
    @State private var highestPrice: Int = 0
    
    let startDate = Calendar.current.date(byAdding: .day, value: -100, to: Date()) ?? Date()
    let endDate = Date()
    
    var body: some View {
        Chart {
            ForEach(stockData) {
                LineMark(
                    x: .value("日時", $0.date, unit: .day, calendar: .autoupdatingCurrent),
                    y: .value("株価", $0.value)
                )
                .foregroundStyle(.blue)
            }
        }
        .frame(height: 250)
        .chartXScale(domain: startDate ... endDate)
        .chartYScale(domain: 0 ... highestPrice)
        .task {
            fetchStockData()
        }
    }
    
    func fetchStockData() {
        SwiftYFinance.chartDataBy(
            identifier: "5246.T",
            start: startDate,
            end: endDate){
                data, error in
                
                if error != nil {
                    return
                }
                
                guard var data = data else {
                    return
                }
                
                stockData = data.compactMap{ .init(date: $0.date!, value: $0.open!)}
                data.sort(by: { a, b -> Bool in
                    return Int(a.open ?? 0) > Int(b.open ?? 0)
                })
                highestPrice = Int(data.first?.open ?? 0)
        }
    }
}

#Preview {
    ContentView()
}