Example for a view and its LibraryContentProvider implementation

CalendarView.swift

import SwiftUI

/// Example of an reusable SwiftUII view available in the Xcode library
struct CalendarView: View {
    var body: some View {
        Text("A fake calendar view :)")
    }
}

@available(iOS 14.0, *)
@available(macOS 11.0, *)
struct CalendarView_LibraryViewContents: LibraryContentProvider {
    var views: [LibraryItem] {
        LibraryItem(CalendarView())
    }
}