CollectionView in SwiftUI

gistfile1.swift

CollectionView(layout: createLayout(),
                           sections: self.sections,
                           items: [
                            .feature : Item.featureItems,
                            .categories : Item.categoryItems
                            ],
                           supplementaryKinds: ["header", "footer"],
                           supplementaryContent: { kind, indexPath, item in
                        
                            switch kind {
                            case "header":
                                return AnyView(Text("Header").font(.system(size: indexPath.section == 0 ? 30 : 16)))
                            case "footer":
                                return AnyView(Text("Footer"))
                            default:
                                return AnyView(EmptyView())
                            }
            },
            content: { indexPath, item in
                
                            AnyView(Text("\(self.sections.first!.rawValue) (\(indexPath.section), \(indexPath.row))"))
            })