SwiftUI：列表、NavigationLink 和徽章

Question

I'm working on my first SwiftUI app, and in it would like to display a List of categories, with a badge indicating the number of items in that category. The title of the category would be on the left, and the badge would be right-aligned on the row. The list would consist of NavigationLink s so that tapping on one would drill further down into the view hierarchy. The code I've written to render the NavigationLink s looks like this:

        List {
            ForEach(myItems.indices) { categoryIndex in
                let category = categories[categoryIndex]
                let title = category.title
                let fetchReq = FetchRequest<MyEntity>(entity: MyEntity(),
                                            animation: .default)
                
                NavigationLink(destination: MyItemView()) {
                    HStack(alignment: .center) {
                        Text(title)
                        Spacer()
                        ZStack {
                            Circle()
                                .foregroundColor(.gray)
                            
                            Text("\(myItemsDict[category]?.count ?? 0)")
                                .foregroundColor(.white)
                                .font(Font.system(size: 12))
                        }
                    }
                }
            }
        }

While it does render a functional NavigationLink , the badge is not displayed right-aligned, as I had hoped. Instead, it looks like this:

I know I'm getting hung up on something in my HStack , but am not sure what. How do I get it so that the category title Text takes up the majority of the row, with the badge right-aligned in the row?

Answer 1

SwiftUI doesn't know how big your Circle should be, so the Spacer doesn't do anything. You should set a fixed frame for it.

struct ContentView: View {
    var body: some View {
        List {
            ForEach(0..<2) { categoryIndex in
                let title = "Logins"
                
                NavigationLink(destination: Text("Hi")) {
                    HStack(alignment: .center) {
                        Text(title)
                        
                        Spacer()
                        
                        ZStack {
                            Circle()
                                .foregroundColor(.gray)
                                .frame(width: 25, height: 25) // here!
                            
                            Text("5")
                                .foregroundColor(.white)
                                .font(Font.system(size: 12))
                        }
                    }
                }
            }
        }
    }
}

Result: