在SwiftUI中加载ViewLoad时如何显示视图

如何解决在SwiftUI中加载ViewLoad时如何显示视图

我不知道如何使用SwiftUI，我只想在加载视图控制器时显示我的视图，如何显示它？

class AnalyticsVC: UIViewController {
    
    override func viewDidLoad() {
        navigationController?.navigationBar.prefersLargeTitles = true
        BarCharts().onAppear()
    }
    
    struct ContentView: View {
        var body: some View {
            BarCharts().onAppear()
        }
    }

    struct BarCharts:View {
        var body: some View {
            vstack {
                BarChartView(data: ChartData(points: [8,23,54,32,12,37,7,43]),title: "title",style: Styles.barChartStyleOrangeLight)
            }
        }
    }
}