Customizing Toolbar and Navigation Bar in SwiftUI

The Toolbar API has been obtainable for a substantial interval, having been launched with the discharge of iOS 14. It was a useful addition to the SwiftUI framework, enabling builders to include menu objects within the navigation and backside bars. In iOS 16, Apple unveiled further modifiers to additional improve the customization of toolbars and supply builders with better management over their look.

On this tutorial, let me present you how one can work with toolbars and handle its customizations.

Utilizing the Toolbar Modifier to Populate Navigation Bar Gadgets

Whether or not it’s essential populate objects in navigation bars or toolbars, you may make the most of the .toolbar modifier to realize this goal. Right here is an instance:

struct ContentView: View {
    var physique: some View {
        NavigationStack {
            Listing(1..

Contained in the closure of toolbar, we create a pair of ordinary buttons utilizing system pictures. With out explicitly specifying the location of the buttons, SwiftUI mechanically positions them within the top-right nook of the navigation bar.

Utilizing ToolbarItem

If it’s essential add extra objects to the navigation bar, you may proceed so as to add buttons within the toolbar closure. Nonetheless, if you wish to management the location of the objects, you may present a group of views with every view wrapped in a ToolbarItem. Under is an instance:

.toolbar {
    ToolbarItem(placement: .principal) {
        Picture(systemName: "individual.crop.circle")
    }

    ToolbarItem(placement: .topBarLeading) {
        Button {
            // motion
        } label: {
            Picture(systemName: "line.3.horizontal")
        }
    }

    ToolbarItem(placement: .topBarTrailing) {
        Button {
            // motion
        } label: {
            Picture(systemName: "plus")
        }
    }

    ToolbarItem(placement: .topBarTrailing) {
        Button {
            // motion
        } label: {
            Picture(systemName: "sq..and.arrow.up")
        }
    }

    ToolbarItem(placement: .bottomBar) {
        Picture(systemName: "folder")
    }

    ToolbarItem(placement: .bottomBar) {
        Picture(systemName: "message")
    }

    ToolbarItem(placement: .standing) {
        Button {

        } label: {
            Textual content("Conceal Navigation")
        }
        .buttonStyle(.borderedProminent)
        .controlSize(.extraLarge)
    }
}

Every ToolbarItem lets you outline the place of the merchandise by using the placement parameter. So as to add objects within the navigation bar, you may specify the next values:

• .topBarLeading – Locations the merchandise in the vanguard of the highest bar.
• .topBarTrailing – Locations the merchandise within the trailing fringe of the highest bar.
• .precept – Locations the merchandise within the principal merchandise part,which is the middle of the navigation bar.

So as to add objects within the backside bar, you may set the worth to .bottomBar and .standing:

• .bottomBar – Locations the merchandise within the backside toolbar.
• .standing – In iOS and iPadOS, the system locations standing objects within the heart of the underside toolbar.

The right way to Conceal the Navigation Bar and Backside Bar

Ranging from iOS 16, the toolbar modifier affords builders the power to handle the visibility of toolbars, together with the navigation bar and backside bar. To cover the navigation bar, you may insert the toolbar modifier inside NavigationStack like this:

.toolbar(.hidden, for: .navigationBar)

If you wish to present an possibility for customers to cover/present the navigation bar, you may declare a state variable like beneath:

@State non-public var showNavBar = true

Then you may replace the .toolbar modifier like this:

.toolbar {

      .
      .
      .

      ToolbarItem(placement: .standing) {
        Button {
            showNavBar.toggle()
        } label: {
            Textual content(showNavBar ? "Conceal Navigation" : "Present Navigation")
        }
        .buttonStyle(.borderedProminent)
        .controlSize(.extraLarge)
    }
}
.toolbar(showNavBar ? .seen : .hidden, for: .navigationBar)
.animation(.easeInOut, worth: showNavBar)

To cover the visibility of the underside bar, you may substitute .navigationBar with .bottomBar. Right here is an instance:

.toolbar(.hidden, for: .bottomBar)

Controlling the Visibility of Toolbar Background

SwiftUI affords one other modifier referred to as toolbarBackground for builders to regulate the visibility of the toolbar background. To make the navigation bar background clear, you may set the worth of toolbarBackground to .hidden:

.toolbarBackground(.hidden, for: .navigationBar)

To make the background seen, you may set the worth to .seen. Right here is an instance:

Listing(1..

After making the code adjustments, it’s best to see a navigation bar with a blurred background when navigating to the element view.

Toolbar Colour Scheme

You possibly can exert further management over the colour scheme of the navigation bar or backside bar by using the toolbarColorScheme modifier. As an example, to use darkish mode to the navigation bar of the element view, you may apply the toolbarColorScheme modifier to the Picture view as demonstrated beneath:

.toolbarColorScheme(.darkish, for: .navigationBar)

Now, once you navigate to the element view, the navigation bar adjustments to darkish mode.

Abstract

All through this tutorial, now we have coated the basics of the Toolbar APIs and explored how one can populate objects in toolbars. Because the SwiftUI framework continues to evolve, it affords builders an expanded vary of functionalities to customise the looks of navigation and backside bars. These developments allow builders to create extra visually interesting and tailor-made consumer interfaces of their SwiftUI apps.

If you wish to be taught extra about SwiftUI, you may try our Mastering SwiftUI ebook. It’s now totally up to date for Xcode 15 and iOS 17.