NSDirectionalEdgeInsets+Helpers.swift

extension NSDirectionalEdgeInsets {

    /// Returns new insets with just a value applied to the supplied edge.
    ///
    /// - Parameters:
    ///   - edge: The edge to apply an inset to.
    ///   - value: The value to set the edge inset to.
    init(_ edge: WritableKeyPath<Self, CGFloat>, _ value: CGFloat) {
        self.init(
            top: edge == \.top ? value : 0.0,
            leading: edge == \.leading ? value: 0.0,
            bottom: edge == \.bottom ? value : 0.0,
            trailing: edge == \.trailing ? value : 0.0
        )
    }

}

let bottomInsets = NSDirectionalEdgeInsets(\.bottom, 200.0)
print(bottomInsets) // NSDirectionalEdgeInsets(top: 0.0, leading: 0.0, bottom: 200.0, trailing: 0.0)