Apple Fonts Slider Catalogue

.swift

import SwiftUI

struct FontSliderCatalogue: View {
    
    @State private var selectedFontIndex: Int = 0
    private var allFontNames: [String] {
        return UIFont.familyNames.flatMap { UIFont.fontNames(forFamilyName: $0) }
    }
    
    var body: some View {
        ZStack {
            Color.black.ignoresSafeArea()
            VStack {
                Spacer()
                Text("A")
                    .font(Font.custom(allFontNames[selectedFontIndex], size: 290))
                    .frame(height: 450)
                    .padding()
                Text(allFontNames[selectedFontIndex]).font(.title2).bold()
                Spacer()
                Slider(value: Binding(
                    get: { Double(Int(self.selectedFontIndex)) },
                    set: { self.selectedFontIndex = Int($0) }
                ), in: 0...(Double(allFontNames.count) - 1), step: 1)
                .padding()
            }
            .foregroundColor(.white)
            .padding()
        }
    }
}

#Preview {
    FontSliderCatalogue()
}