The Toolbar API has been accessible 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 extra modifiers to additional improve the customization of toolbars and supply builders with better management over their look.
On this tutorial, let me present you the way to work with toolbars and handle its customizations.
Utilizing the Toolbar Modifier to Populate Navigation Bar Gadgets
Whether or not it’s essential to populate objects in navigation bars or toolbars, you possibly can make the most of the .toolbar modifier to realize this goal. Right here is an instance:
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struct ContentView: View { var physique: some View { NavigationStack { Checklist(1..<10, id: .self) { index in NavigationLink(“Merchandise (index)“) { Picture(“legomen”) .resizable() .ignoresSafeArea() } }
.navigationTitle(“Toolbar Demo”)
.toolbar { Button { // motion } label: { Picture(systemName: “plus”) }
Button { // motion } label: { Picture(systemName: “sq..and.arrow.up”) }
} }
} } |
Contained in the closure of toolbar, we create a pair of normal buttons utilizing system photos. With out explicitly specifying the location of the buttons, SwiftUI routinely positions them within the top-right nook of the navigation bar.
Utilizing ToolbarItem
If it’s essential to add extra objects to the navigation bar, you possibly can proceed so as to add buttons within the toolbar closure. Nonetheless, if you wish to management the location of the objects, you possibly can present a set of views with every view wrapped in a ToolbarItem. Under is an instance:
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.toolbar { ToolbarItem(placement: .principal) { Picture(systemName: “particular person.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(“Disguise Navigation”) } .buttonStyle(.borderedProminent) .controlSize(.extraLarge) } } |
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 possibly can specify the next values:
.topBarLeading– Locations the merchandise in the forefront 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 possibly can 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.
How one can Disguise the Navigation Bar and Backside Bar
Ranging from iOS 16, the toolbar modifier provides builders the flexibility to handle the visibility of toolbars, together with the navigation bar and backside bar. To cover the navigation bar, you possibly can insert the toolbar modifier inside NavigationStack like this:
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.toolbar(.hidden, for: .navigationBar) |
If you wish to present an possibility for customers to cover/present the navigation bar, you possibly can declare a state variable like under:
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@State non-public var showNavBar = true |
Then you possibly can replace the .toolbar modifier like this:
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.toolbar {
. . .
ToolbarItem(placement: .standing) { Button { showNavBar.toggle() } label: { Textual content(showNavBar ? “Disguise 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 possibly can change .navigationBar with .bottomBar. Right here is an instance:
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.toolbar(.hidden, for: .bottomBar) |
Controlling the Visibility of Toolbar Background
SwiftUI provides one other modifier known as toolbarBackground for builders to regulate the visibility of the toolbar background. To make the navigation bar background clear, you possibly can set the worth of toolbarBackground to .hidden:
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.toolbarBackground(.hidden, for: .navigationBar) |
To make the background seen, you possibly can set the worth to .seen. Right here is an instance:
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Checklist(1..<10, id: .self) { index in NavigationLink(“Merchandise (index)“) { Picture(“legomen”) .resizable() .ignoresSafeArea() .toolbarBackground(.seen, for: .navigationBar) } } |
After making the code modifications, it is best to see a navigation bar with a blurred background when navigating to the element view.
Toolbar Coloration Scheme
You possibly can exert extra 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 possibly can apply the toolbarColorScheme modifier to the Picture view as demonstrated under:
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.toolbarColorScheme(.darkish, for: .navigationBar) |
Now, whenever you navigate to the element view, the navigation bar modifications to darkish mode.
Abstract
All through this tutorial, now we have lined the basics of the Toolbar APIs and explored the way to populate objects in toolbars. Because the SwiftUI framework continues to evolve, it provides 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 possibly can try our Mastering SwiftUI e-book. It’s now totally up to date for Xcode 15 and iOS 17.