border を特定の side に指定したい

SwiftUI - Add Border to One Edge of an Image

swift

.border(width: 5, edges: [.top, .leading], color: .yellow)



extension View {
    func border(width: CGFloat, edges: [Edge], color: Color) -> some View {
        overlay(EdgeBorder(width: width, edges: edges).foregroundColor(color))
    }
}

struct EdgeBorder: Shape {
    var width: CGFloat
    var edges: [Edge]

    func path(in rect: CGRect) -> Path {
        edges.map { edge -> Path in
            switch edge {
            case .top: return Path(.init(x: rect.minX, y: rect.minY, width: rect.width, height: width))
            case .bottom: return Path(.init(x: rect.minX, y: rect.maxY - width, width: rect.width, height: width))
            case .leading: return Path(.init(x: rect.minX, y: rect.minY, width: width, height: rect.height))
            case .trailing: return Path(.init(x: rect.maxX - width, y: rect.minY, width: width, height: rect.height))
            }
        }.reduce(into: Path()) { $0.addPath($1) }
    }
}