Untitled

https://developer.apple.com/documentation/Swift/MainActor
var body: some View {
    List {
        Text("A List Item")
        Text("A Second List Item")
        Text("A Third List Item")
    }
}

struct Ocean: Identifiable {
    let name: String
    let id = UUID()
}

private var oceans = [
    Ocean(name: "Pacific"),
    Ocean(name: "Atlantic"),
    Ocean(name: "Indian"),
    Ocean(name: "Southern"),
    Ocean(name: "Arctic")
]

var body: some View {
    List(oceans) {
        Text($0.name)
    }
} struct Ocean: Identifiable, Hashable {
    let name: String
    let id = UUID()
}

private var oceans = [
    Ocean(name: "Pacific"),
    Ocean(name: "Atlantic"),
    Ocean(name: "Indian"),
    Ocean(name: "Southern"),
    Ocean(name: "Arctic")
]

@State private var multiSelection = Set<UUID>()

var body: some View {
    NavigationView {
        List(oceans, selection: $multiSelection) {
            Text($0.name)
        }
        .navigationTitle("Oceans")
        .toolbar { EditButton() }
    }
    Text("\(multiSelection.count) selections")
}
(refresh)=

struct Ocean: Identifiable, Hashable {
     let name: String
     let id = UUID()
     let stats: [String: String]
 }

 class OceanStore: ObservableObject {
     @Published var oceans = [Ocean]()
     func loadStats() async {}
 }

 @EnvironmentObject var store: OceanStore

 var body: some View {
     NavigationView {
         List(store.oceans) { ocean in
             HStack {
                 Text(ocean.name)
                 StatsSummary(stats: ocean.stats) // A custom view for showing statistics.
             }
         }
         .refreshable {
             await store.loadStats()
         }
         .navigationTitle("Oceans")
     }
 } struct ContentView: View {
    struct Sea: Hashable, Identifiable {
        let name: String
        let id = UUID()
    }

    struct OceanRegion: Identifiable {
        let name: String
        let seas: [Sea]
        let id = UUID()
    }

    private let oceanRegions: [OceanRegion] = [
        OceanRegion(name: "Pacific",
                    seas: [Sea(name: "Australasian Mediterranean"),
                           Sea(name: "Philippine"),
                           Sea(name: "Coral"),
                           Sea(name: "South China")]),
        OceanRegion(name: "Atlantic",
                    seas: [Sea(name: "American Mediterranean"),
                           Sea(name: "Sargasso"),
                           Sea(name: "Caribbean")]),
        OceanRegion(name: "Indian",
                    seas: [Sea(name: "Bay of Bengal")]),
        OceanRegion(name: "Southern",
                    seas: [Sea(name: "Weddell")]),
        OceanRegion(name: "Arctic",
                    seas: [Sea(name: "Greenland")])
    ]

    @State private var singleSelection: UUID?

    var body: some View {
        NavigationView {
            List(selection: $singleSelection) {
                ForEach(oceanRegions) { region in
                    Section(header: Text("Major \(region.name) Ocean Seas")) {
                        ForEach(region.seas) { sea in
                            Text(sea.name)
                        }
                    }
                }
            }
            .navigationTitle("Oceans and Seas")
        }
    }
} struct ContentView: View {
    struct FileItem: Hashable, Identifiable, CustomStringConvertible {
        var id: Self { self }
        var name: String
        var children: [FileItem]? = nil
        var description: String {
            switch children {
            case nil:
                return "📄 \(name)"
            case .some(let children):
                return children.isEmpty ? "📂 \(name)" : "📁 \(name)"
            }
        }
    }
    let fileHierarchyData: [FileItem] = [
      FileItem(name: "users", children:
        [FileItem(name: "user1234", children:
          [FileItem(name: "Photos", children:
            [FileItem(name: "photo001.jpg"),
             FileItem(name: "photo002.jpg")]),
           FileItem(name: "Movies", children:
             [FileItem(name: "movie001.mp4")]),
              FileItem(name: "Documents", children: [])
          ]),
         FileItem(name: "newuser", children:
           [FileItem(name: "Documents", children: [])
           ])
        ]),
        FileItem(name: "private", children: nil)
    ]
    var body: some View {
        List(fileHierarchyData, children: \.children) { item in
            Text(item.description)
        }
    }
}