Your Second iOS & SwiftUI App

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

Part 1: List View Fundamentals

04. SF Symbols

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Previous episode: 03. Models & Views Next episode: 05. Challenge: Book Row

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OK! We’re ready to start working on the image version that renders a “letter square”. We could make fancy letter graphics from scratch by combining text and shapes and things with SwiftUI, but SF Symbols already has some really nice options for us.

    Book.Image()
  }
}

extension Image {
 
}

extension Image {
  init(title: String) {

  }
}

init?(title: String) {

  init?(title: String) {
  guard let character = title.first else {
      <#statements#>
    }
  }

    guard let character = title.first else {
      return nil
    }

      return nil
    }

    let symbolName = "\(character).square"
  }

    let symbolName = "\(character).square"
    self.init(systemName: symbolName)
  }

let symbolName = "\(character.lowercased()).square"

  struct Image: View {
    let title: String

    var body: some View {

  static var previews: some View {
    Book.Image(title: Book().title)

Book.Image(title: Book().title)

    var body: some View {
      let symbol =
        SwiftUI.Image(title: title)

      SwiftUI.Image(systemName: "book")

      let symbol =
        SwiftUI.Image(title: title)
        ?? SwiftUI.Image(systemName: "book")
        
        .resizable()

?? 🟩.init(systemName: "book")

        ?? SwiftUI.Image(systemName: "book")

      symbol
        .resizable()

  static var previews: some View {
    VStack {
      Book.Image(title: Book().title)
    }
  }

    VStack {
      Book.Image(title: Book().title)
      Book.Image(title: "")
    }

      Book.Image(title: "")
      Book.Image(title: "📖")
    }

  init?(title: String) {
    guard
      let character = title.first🟩,
      case let symbolName = "\(character.lowercased()).square",

    let symbolName = "\(character.lowercased()).square"

    guard UIImage(systemName: symbolName) != nil else {
      <#statements#>
    }

    self.init(systemName: symbolName)

    guard UIImage(systemName: symbolName) != nil else {
      return nil
    }

    guard
      let character = title.first,
      🟩case let symbolName = "\(character.lowercased()).square",
      UIImage(systemName: symbolName) != nil