SwiftUI Alignment Guides (aligning vertical to horizontal)

alignment_guides.swift

import SwiftUI

extension VerticalAlignment {
    struct VertAlignName: AlignmentID {
        static func defaultValue(in d: ViewDimensions) -> CGFloat {
            d[.top]
        }
    }
    static let vertAlignName = VerticalAlignment(VertAlignName.self)
}

extension HorizontalAlignment {
    struct HorizAlignName: AlignmentID {
        static func defaultValue(in d: ViewDimensions) -> CGFloat {
            d[.top]
        }
    }
    static let horizAlignName = HorizontalAlignment(HorizAlignName.self)
}

struct ContentView: View {
    var body: some View {
        ZStack(alignment: Alignment(horizontal: .horizAlignName, vertical: .vertAlignName)) {
            VStack {
                Text("A")
                Text("B")
                Text("C")
                    .alignmentGuide(.vertAlignName) { d in d[VerticalAlignment.center] }
                    .alignmentGuide(.horizAlignName) { d in d[HorizontalAlignment.center] }
            }
            HStack {
                Text("A")
                Text("B")
                Text("C")
                    .alignmentGuide(.vertAlignName) { d in d[VerticalAlignment.center] }
                    .alignmentGuide(.horizAlignName) { d in d[HorizontalAlignment.center] }
            }
        }
        .font(.largeTitle)
    }
}