I'm making a macOS app (also iPadOS, but macOS is the priority) in SwiftUI, and I'm trying to implement functionality similar to finder, where you can double-tap an item in order to change it's name, but I'm not sure how to do that!

This is my current layout (stuff not really relevant to the question has been cut out for brevity), I want to edit the names of the colorBooks by double-tapping on the entry in the navigation view, and getting a text field until it leaves focus or you press enter or whatever.

@AppStorage("colorBooks") var colorBooks: [String: URL] = [:]

var body: some View {
    NavigationView {
            VStack(alignment: .leading) {
                List {
                    Text("Color Books")
                        .font(.system(size: 12, weight: .bold, design: .default))
                        .foregroundColor(.gray)
                    ForEach(Array(colorBooks.keys).sorted(by: >), id: \.self) { key in
                        if let path = colorBooks[key], let colorBook = ColorBook(path) {
                            NavigationLink(destination: ColorBookView(colorBook)) {
                                Label(key, systemImage: "tag")
                                    .font(.system(size: 13, weight: .medium, design: .default))
                            }
                            .buttonStyle(.borderless)
                            .navigationTitle(key)
                            .contextMenu {
                                // ...
                            }
                        }
                    }
                }.listStyle(SidebarListStyle())
                // ...
            }
        }
        .navigationViewStyle(DoubleColumnNavigationViewStyle())
}

I don't know this is possible with your approach. Because as soon as you tap the NavigationLink fires. But I could be wrong. But my guess is you can't use a NavigationLink here but you have to use an .onTapGesture for both where you have to differeniate between one tap and a double tap.

@Hatsushira hm, how do I still get the double-column view without NavigationLink and it's destination, then?

Sorry, this is my first time using NavigationViews

With the current implementation of the Sidebar in SwiftUI I don't think this is possible. The sidebar implentation with SidebarListStyle() is a very easy way to get the effect but I don't think it's fully customizable yet. I don't know about the new versions of MacOS/iPadOS and SwiftUI 3.0.