Your Second iOS & SwiftUI App

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

Part 2: Data Flow

16. Model Objects

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Previous episode: 15. Challenge: Image Deletion Button Next episode: 17. Observable Objects

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Notes: 16. Model Objects

Equatable

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In this episode, you’re going to put the finishing touches on your book model!

  let author: String
  var microReview: String

  init(title: String = "Title", author: String = "Author") {

  var microReview: String

  init(
    title: String = "Title",
    author: String = "Author",
    microReview: String = ""
  ) {
    self.title = title
    self.author = author
    self.microReview = microReview
  }

  var microReview: String
  var readMe: Bool

  init(

    microReview: String = "",
    readMe: Bool = true
  ) {
    self.title = title
    self.author = author
    self.microReview = microReview
    self.readMe = readMe
  }

HStack {

TitleAndAuthorStack(...)
}

HStack(spacing: 16)

    Button {

    }

    Button {

    } label: {
      Image(systemName: <#T##String#>)
    }
  }

Image(systemName: book.readMe ? "bookmark.fill")

"bookmark.fill" : "bookmark")

    } label: {
      Image(systemName: book.readMe ? "\(bookmark).fill" : bookmark)
        .font(.system(size: 48, weight: .light))
    }

    Button {
      book.readMe.toggle()
    } label: {

  🟩var🟩 book: Book

class Book: Hashable {

class Book: Hashable {

extension Book: Equatable {

}

    self.readMe = readMe
  }
}

extension Book: Equatable {
  static func == (lhs: Book, rhs: Book) -> Bool {
    <#code#>
  }
}

  static func == (lhs: Book, rhs: Book) -> Bool {
    lhs === rhs
  }

public func === (lhs: AnyObject?, rhs: AnyObject?) -> Bool {

return ObjectIdentifier(l) == ObjectIdentifier(r)

class Book {

    self.readMe = readMe
  }
}

extension Book: Hashable {

}

extension Book: Equatable {

extension Book: Hashable {
  func hash(into hasher: inout Hasher) {
    <#code#>
  }
}

  func hash(into hasher: inout Hasher) {
    hasher.combine(<#T##value: Hashable##Hashable#>)
  }

hasher.combine(ObjectIdentifier(self))

hasher.combine(ObjectIdentifier(self))

extension Book: Hashable, Identifiable {

hasher.combine(id)

List(library.sortedBooks) { book in