Create a common layout for the navigation bar in SwiftUI, so other SwiftUI views should reuse same Nav Bar

Question

In iOS SwiftUI, how can we make a common layout for the navigation bar, so we can use that in all projects without rewriting the same code?

We can use ViewBuilder to create a base view for common code as follows:

struct BaseView<Content: View>: View {
    let content: Content
    init(@ViewBuilder content: () -> Content) {
        self.content = content()
    }
    var body: some View {
        // To-do: The most important part will go here
    }
}

How can we add navigation bar code in View Builder or base view?

Did you try to define the navigation bar in a different struct view and use it as an overlay in different views? — arata
– arata, Commented Jan 25, 2022 at 17:08
No, i haven't tried that approach. I had tried to add Navigation bar in Base view, but this approach is not working. — GrayFox
– GrayFox, Commented Jan 25, 2022 at 17:23

Peter Mortensen · Accepted Answer · 2022-11-03 21:24:13Z

4

You can create an extension of view like this way. You can check out my blog entry for details.

import SwiftUI

extension View {
    /// CommonAppBar
    public func appBar(title: String, backButtonAction: @escaping() -> Void) -> some View {

        self
            .navigationTitle(title)
            .navigationBarTitleDisplayMode(.inline)
            .navigationBarBackButtonHidden(true)
            .navigationBarItems(leading: Button(action: {
                backButtonAction()
            }) {
                Image("ic-back") // set backbutton image here
                    .renderingMode(.template)
                    .foregroundColor(Colors.AppColors.GrayscaleGray2)
            })
    }
}

Now you can use this appBar in any place of the view.

struct TransactionsView: View {
    @Environment(\.presentationMode) var mode: Binding<PresentationMode>

    var body: some View {
        VStack(spacing: 0) {

        }
        .appBar(title: "Atiar Talukdar") {
            self.mode.wrappedValue.dismiss()
        }
    }
}

struct TransactionsView_Previews: PreviewProvider {
    static var previews: some View {
        TransactionsView()
    }
}

edited Nov 3, 2022 at 21:24

Peter Mortensen

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answered Apr 22, 2022 at 3:17

Atiar Talukdar

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1 Comment

Machavity Over a year ago

This answer is being discussed on Meta

Peter Mortensen · Accepted Answer · 2022-10-21 17:05:56Z

2

One way to achieve this is to use a custom view as an overlay.

For example, consider the below code which makes a custom navigation bar using an overlay:

struct Home: View {
    var body: some View {
        ScrollView {
            // Your Content
        }
        .overlay {
            ZStack {
                Color.clear
                    .background(.ultraThinMaterial)
                    .blur(radius: 10)

                Text("Navigation Bar")
                    .font(.largeTitle.weight(.bold))
                    .frame(maxWidth: .infinity, alignment: .leading)
                    .padding(.leading, 20)
            }
            .frame(height: 70)
            .frame(maxHeight: .infinity, alignment: .top)
        }
    }
}

The ZStack inside the .overlay will make a view that looks like a navigation bar. You can then move it to its own struct view, add different variables to it and call it from the overlay.

edited Oct 21, 2022 at 17:05

Peter Mortensen

31.4k22 gold badges110 silver badges134 bronze badges

answered Jan 25, 2022 at 17:17

arata

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5 Comments

GrayFox Over a year ago

Thanks @arata for response, Can we write some wrapper on Navigation view So we can take benefit of default Nav Bar functionality in some classes if required.

arata Over a year ago

@GrayFox So, you want to modify the default navigation bar rather than making a new one from scratch? (This one is also a similar questions in a way) stackoverflow.com/questions/57686218/…

GrayFox Over a year ago

Yes @arata, it would be better if we use existing Navigation bar rather than to create a new one.

GrayFox Over a year ago

Yes @arata, In that question[stackoverflow.com/questions/57686218/… View Modifier is used to create a base view, But i wanna to reuse Navigation bar is same manner if possible.

arata Over a year ago

@GrayFox interesting, never thought of it in that way. Maybe someone could answer your question.

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