[iOS 14 Menu Example]

MenuPicker.swift

public struct MenuPicker<T, V: View>: View {
    
    @Binding var selected: Int
    var array: [T]
    var title: String?
    let mapping: (T) -> V
    
    public init(selected: Binding<Int>, array: [T], title: String? = nil,
                mapping: @escaping (T) -> V) {
        self._selected = selected
        self.array = array
        self.title = title
        self.mapping = mapping
    }
    
    public var body: some View {
        if let existingTitle = title {
            HStack {
                Text(existingTitle + ":")
                    .foregroundColor(.primary)
                menu
            }
        } else {
            menu
        }
    }
    
    var menu: some View {
        
        Menu(content: {
            Picker(selection: $selected, label: Text("")) {
                ForEach(array.indices, id: \.self) { index in
                    Button(action: {
                        selected = index
                    }, label: {
                        mapping(array[index])
                    })
                }
            }
            
            
        }
        , label: {
            mapping(array[selected])
            Image(systemName: "chevron.down")
                .font(.system(size: UIFont.preferredFont(forTextStyle: .footnote).pointSize, weight: .regular))
        }
        )
    }
}

struct MView: View {
    let name: String
    
    var body: some View {
        Text(name)
    }
}

func MapIt(name: String) -> MView
{
    MView(name: name)
}