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SwiftUI modifier to juxtapose a view to a root view without affecting the layout of the root view.
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| import SwiftUI | |
| public extension View { | |
| func juxtapose<Content>( | |
| edge: Edge = .top, | |
| spacing: CGFloat = 8, | |
| @ViewBuilder content: @escaping () -> Content | |
| ) -> some View where Content: View { | |
| modifier( | |
| JuxtaposedViewModifier( | |
| edge: edge, | |
| spacing: spacing, | |
| juxtaposedView: content | |
| ) | |
| ) | |
| } | |
| func juxtapose<Content>( | |
| alignment: Alignment = .top, | |
| spacing: CGSize = .init(width: 8, height: 8), | |
| @ViewBuilder content: @escaping () -> Content | |
| ) -> some View where Content: View { | |
| modifier( | |
| JuxtaposedViewModifier( | |
| alignment: alignment, | |
| spacing: spacing, | |
| juxtaposedView: content | |
| ) | |
| ) | |
| } | |
| } | |
| public struct JuxtaposedViewModifier<JuxtaposedView: View>: ViewModifier { | |
| public init( | |
| edge: Edge = .top, | |
| spacing: CGFloat = 8, | |
| @ViewBuilder juxtaposedView: @escaping () -> JuxtaposedView | |
| ) { | |
| switch edge { | |
| case .top: alignment = .top | |
| case .leading: alignment = .leading | |
| case .bottom: alignment = .bottom | |
| case .trailing: alignment = .trailing | |
| } | |
| self.spacing = .init(width: spacing, height: spacing) | |
| self.juxtaposedView = juxtaposedView | |
| } | |
| public init( | |
| alignment: Alignment = .top, | |
| spacing: CGSize = .init(width: 8, height: 8), | |
| @ViewBuilder juxtaposedView: @escaping () -> JuxtaposedView | |
| ) { | |
| self.alignment = alignment | |
| self.spacing = spacing | |
| self.juxtaposedView = juxtaposedView | |
| } | |
| private let alignment: Alignment | |
| private let spacing: CGSize | |
| private let juxtaposedView: () -> JuxtaposedView | |
| public func body(content: Content) -> some View { | |
| content | |
| .overlay( | |
| juxtaposedView() | |
| .alignmentGuide(alignment.vertical) { | |
| $0[juxtaposedViewAlignment.vertical] + verticalSpacing | |
| } | |
| .alignmentGuide(alignment.horizontal) { | |
| $0[juxtaposedViewAlignment.horizontal] + horizontalSpacing | |
| } | |
| .frame( | |
| maxWidth: .infinity, | |
| maxHeight: .infinity, | |
| alignment: alignment | |
| ) | |
| ) | |
| } | |
| private var horizontalSpacing: CGFloat { | |
| switch alignment { | |
| case .topLeading: fallthrough | |
| case .bottomLeading: fallthrough | |
| case .leading: return spacing.width | |
| case .topTrailing: fallthrough | |
| case .bottomTrailing: fallthrough | |
| case .trailing: return -spacing.width | |
| default: return 0 | |
| } | |
| } | |
| private var verticalSpacing: CGFloat { | |
| switch alignment { | |
| case .topLeading: fallthrough | |
| case .topTrailing: fallthrough | |
| case .top: return spacing.height | |
| case .bottomLeading: fallthrough | |
| case .bottomTrailing: fallthrough | |
| case .bottom: return -spacing.height | |
| default: return 0 | |
| } | |
| } | |
| private var juxtaposedViewAlignment: Alignment { | |
| switch alignment { | |
| case .leading: return .trailing | |
| case .trailing: return .leading | |
| case .top: return .bottom | |
| case .bottom: return .top | |
| case .topLeading: return .bottomTrailing | |
| case .topTrailing: return .bottomLeading | |
| case .bottomLeading: return .topTrailing | |
| case .bottomTrailing: return .topLeading | |
| default: return alignment | |
| } | |
| } | |
| } | |
| // MARK: Demo | |
| struct ContentView: View { | |
| var size: CGSize | |
| var body: some View { | |
| RoundedRectangle(cornerRadius: 8) | |
| .strokeBorder() | |
| .frame(width: size.width, height: size.height) | |
| .juxtapose(edge: .top) { | |
| suit("club") | |
| } | |
| .juxtapose(edge: .bottom) { | |
| suit("spade") | |
| .juxtapose(alignment: .topTrailing, spacing: .zero) { | |
| Text("Player 1").font(.caption).bold().fixedSize() | |
| } | |
| .juxtapose(alignment: .bottomLeading) { | |
| Text("Dealer").font(.caption).bold().fixedSize() | |
| .juxtapose(edge: .bottom, spacing: 0) { | |
| Image(systemName: "star.circle.fill") | |
| } | |
| } | |
| } | |
| .juxtapose(edge: .leading, spacing: 33) { | |
| suit("heart") | |
| .foregroundColor(.red) | |
| } | |
| .juxtapose(edge: .trailing, spacing: -10) { | |
| suit("diamond") | |
| .foregroundColor(.red) | |
| } | |
| } | |
| func suit(_ name: String) -> some View { | |
| Image(systemName: "suit.\(name).fill") | |
| .resizable() | |
| .aspectRatio(contentMode: .fit) | |
| .frame(height: 33) | |
| } | |
| } | |
| struct ContentView_Previews: PreviewProvider { | |
| static var previews: some View { | |
| VStack { | |
| Spacer() | |
| ContentView(size: .init(width: 66, height: 66)) | |
| Spacer() | |
| ContentView(size: .init(width: 200, height: 33)) | |
| Spacer() | |
| ContentView(size: .init(width: 33, height: 66)) | |
| Spacer() | |
| } | |
| } | |
| } |
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