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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 invaluable 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 higher management over their look.

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

Utilizing the Toolbar Modifier to Populate Navigation Bar Gadgets

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

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 routinely positions them within the top-right nook of the navigation bar.

swiftui-toolbar-navigation-items

Utilizing ToolbarItem

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

Every ToolbarItem allows you to 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.
swiftui-toolbar-bottom-bar

The right way to Conceal the Navigation Bar and Backside Bar

Ranging from iOS 16, the toolbar modifier affords builders the flexibility 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:

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

Then you may replace the .toolbar modifier like this:

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

Controlling the Visibility of Toolbar Background

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

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

After making the code modifications, you need to see a navigation bar with a blurred background when navigating to the element view.

swiftui-toolbar-background

Toolbar Colour Scheme

You may exert further management over the colour scheme of the navigation bar or backside bar by using the toolbarColorScheme modifier. For 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 under:

Now, while you navigate to the element view, the navigation bar modifications to darkish mode.

swiftui-toolbar-background-dark-mode

Abstract

All through this tutorial, we have now coated the basics of the Toolbar APIs and explored how you 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 person interfaces of their SwiftUI apps.

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



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