SwiftUI: Layout & Interfaces

Nov 18 2021 Swift 5.5, iOS 15, Xcode 13

Part 2: Aligning Views

13. Custom Alignment

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Previous episode: 12. Alignment Guides Next episode: 14. Challenge: Custom Alignment Guides

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By now, you should be feeling pretty familiar with all of the built-in Alignments that SwiftUI offers to you. Three HorizontalAlignments and five VerticalAlignments.

        Text("Learn SwiftUI layout!")
          .alignmentGuide(HorizontalAlignment.center) { dimension in
            /*@START_MENU_TOKEN@*/ /*@PLACEHOLDER=Value@*/dimension[.top]/*@END_MENU_TOKEN@*/
          }

        Text("Learn SwiftUI layout!")
          .alignmentGuide(HorizontalAlignment.center) { $0[.leading] }
      }

VStack(alignment) {

}

enum CustomCenter: AlignmentID {

}

struct ScaledImage: View {

enum CustomCenter: AlignmentID {
  static func defaultValue(in context: ViewDimensions) -> CGFloat {
    <#code#>
  }
}

context[HorizontalAlignment.center]

extension HorizontalAlignment {
  enum CustomCenter: AlignmentID {
    static func defaultValue(in context: ViewDimensions) -> CGFloat {
      context[HorizontalAlignment.center]
    }
  }
}

  }

  static let customCenter =
}

static let customCenter = HorizontalAlignment(CustomCenter.self)

static let customCenter = Self(CustomCenter.self)

VStack(alignment: .customCenter) {

    static func defaultValue(in context: ViewDimensions) -> CGFloat {
//      context[HorizontalAlignment.center]
      -300
    }

context[HorizontalAlignment.center]

.alignmentGuide(.customCenter) { $0[.leading] }

        Text("Help others learn it too!")
          .alignmentGuide(.customCenter), computeValue: <#T##(ViewDimensions) -> CGFloat#>)
        ScaledImage("Hearts")

.alignmentGuide(.customCenter) { $0[.trailing] }