import UIKit

struct API {
    func fetch(completion: @escaping (() -> Void)) { completion() }
}

final class ViewController: UIViewController {
    private let api = API()

    override func viewDidLoad() {
        super.viewDidLoad()
        fetchData()
    }

    func fetchData() {
        api.fetch { [weak self] in
            guard let self else { return }
            loadUI() // implicitly refers to `self.loadUI()`
        }
    }

    func loadUI() {}
}

let viewcontroller = ViewController()
viewcontroller.loadViewIfNeeded()

import SwiftUI

struct BottomSheet: View {
    var body: some View {
        Text("Bottom Sheet")
    }
}

struct ContentView: View {
    @State private var isBottomSheetPresented = false

    var body: some View {
        Button(action: {
            isBottomSheetPresented.toggle()
        }) {
            Text("Present Sheet")
        }
        .sheet(isPresented: $isBottomSheetPresented) {
            BottomSheet()
                .presentationDetents([
                    .fraction(0.3),
                    .height(200),
                    .medium,
                    .large
                ])
                // 1
                // To let people interact with the content behind a sheet
                .presentationBackgroundInteraction( // only available in iOS 16.4 or newer
                    .enabled(upThrough: .fraction(0.3))
                )
                // 2
                // Give your sheet a translucent background
                .presentationBackground(.thinMaterial)
                // 3
                // New feature in iOS 16.4 corner radius on the sheet
                .presentationCornerRadius(24)
        }
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}