Your Second iOS & SwiftUI App

Nov 4 2021 · Swift 5.5, iOS 15, Xcode 13

Part 3: Managing Rows

27. Delete & Move Rows

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Previous episode: 26. Swipe Actions Next episode: 28. Conclusion

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To recap, we’re going to let users delete books from their library in two ways: first, the swipe action we already set up, and second, via an edit button.

        🟩.onDelete(perform: { indexSet in
          /*@START_MENU_TOKEN@*//*@PLACEHOLDER=Code@*/ /*@END_MENU_TOKEN@*/
        })
        .labelStyle...
      }

          BookRow(book: $0)
        }
        .onDelete { indexSet in

        }
      }

func deleteBook🟩s🟥() {

func deleteBooks(🟩atOffsets offsets: IndexSet) {

func deleteBooks(atOffsets offsets: IndexSet🟩, section: Section) {

      sortedBooks[section]
      // TODO: Remove Image

sortedBooks[section]?.remove(atOffsets: <#T##IndexSet#>)

remove(atOffsets: offsets)

  var sortedBooks: [Section: [Book]] 🟩{
    get {
      ...
    }
    set {

    }
  }🟥

set {
🟩booksCache =
      sortedBooks
      .sorted { $1.key == .finished }
      .flatMap { $0.value }

    set {
      booksCache = newValue
    }

  func deleteBooks(atOffsets offsets: IndexSet, section: Section?) {
    🟩let booksBeforeDeletion = booksCache


      sortedBooks.remove(atOffsets: offsets)
    }

    🟩booksCache.difference(from: booksBeforeDeletion)
  }

    for change in booksCache.difference(from: booksBeforeDeletion) {

    }
  }

    for change in booksCache.difference(from: booksBeforeDeletion) {
      switch change {
      
      }
    }

    for change in booksCache.difference(from: booksBeforeDeletion) {
      switch change {
      case .insert(offset: let offset, element: let element, associatedWith: let associatedWith):
        <#code#>
      case .remove(offset: let offset, element: let element, associatedWith: let associatedWith):
        <#code#>
      }
    }

      switch change {
      case .remove(offset: let offset, element: let element, associatedWith: let associatedWith):
        <#code#>
      }

      if case .remove(offset: let offset, element: let element, associatedWith: let associatedWith)💰 = change {
        <#code#>
      }

if case .remove(_, let element, _) = change {

(_, let deletedBook, _)

      if case .remove(_, let deletedBook, _) = change {
        uiImages[deletedBook] = nil
      }

            .swipeActions(edge: .trailing) {
              Button(role: .destructive) {
                guard let index = books.firstIndex(where: {$0.id == book.id})
                else { return }
                
                withAnimation {
                  library.deleteBooks(atOffsets: .init(integer: index), section: section)
                }

        .onDelete { indexSet in
            withAnimation {
                  library.deleteBooks(atOffsets: .init(integer: index), section: section)
                }
        }

        ForEach(Section.allCases, id: \.self) {
          SectionView(section: $0)
        }
      }
      🟩.toolbar(content: <#T##() -> ToolbarContent#>)
      .navigationTitle("My Library")

.toolbar(content: 🟩EditButton.init)

        .onDelete { indexSet in
          ...
        }
        .onMove { indices, newOffset in

        }
      }

  }

  func moveBooks(
  
  ) {

  }

  /// Load, save, or delete an image corresponding to a book's title and author.

  func moveBooks(
    oldOffsets: IndexSet
  ) {

  func moveBooks(
    oldOffsets: IndexSet, newOffset: Int
  ) {

  func moveBooks(
    oldOffsets: IndexSet, newOffset: Int,
    section: Section
  ) {

    section: Section
  ) {
    sortedBooks[section]
  }

  ) {
    sortedBooks[section]?.move(fromOffsets: oldOffsets, toOffset: newOffset)
  }

        .onMove { indices, newOffset in
          library.moveBooks(
            oldOffsets: indices, newOffset: newOffset,
            section: section
          )
        }