SwiftUI: Layout & Interfaces

Nov 18 2021 · Swift 5.5, iOS 15, Xcode 13

Part 2: Aligning Views

14. Challenge: Custom Alignment Guides

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Notes: 14. Challenge: Custom Alignment Guides

This course was originally recorded in 2019. It has been reviewed and all content and materials updated as of October 2021.

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This is a screenshot from the language learning app Duolingo. Duo is its owl mascot, and your coach. When using the app regularly, you amass gems. And in the Shop tab, you can trade them in for outfits for Duo to wear. In this episode, you’ll be recreating a layout inspired by this shop.

          .frame(width: 120)

Text("💎 \(razémon.cost)")
VStack(alignment: .leading, spacing: 15) {

extension Razémon: AlignmentID {


struct ContentView_Previews: PreviewProvider {
extension Razémon: AlignmentID {
  static func defaultValue(in context: ViewDimensions) -> CGFloat {
extension VerticalAlignment {
  static let raz
static let razémon 
static let razémon = Self(Razémon.self)
      HStack(alignment: .razémon) {
            .alignmentGuide(<#T##g: VerticalAlignment##VerticalAlignment#>, computeValue: <#T##(ViewDimensions) -> CGFloat#>)
            .alignmentGuide(.razémon, computeValue: <#T##(ViewDimensions) -> CGFloat#>)
              computeValue: Razémon.defaultValue
          .frame(width: 120)
          .alignmentGuide(.razémon) {

          .alignmentGuide(.razémon) {
razémon.eyePosition * $0[.bottom]
import AlignmentExtensions
extension Razémon: SingleAxisAlignmentID {

typealias Alignment = VerticalAlignment