The Toolbar API has been accessible for a substantial interval, having been launched with the discharge of iOS 14. It was a priceless 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 easy methods to work with toolbars and handle its customizations.
Utilizing the Toolbar Modifier to Populate Navigation Bar Objects
Whether or not it is advisable populate objects in navigation bars or toolbars, you possibly can make the most of the .toolbar modifier to attain 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 position of the buttons, SwiftUI mechanically positions them within the top-right nook of the navigation bar.
Utilizing ToolbarItem
If it is advisable 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 position of the objects, you possibly can present a group of views with every view wrapped in a ToolbarItem. Beneath 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(“Conceal 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 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 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 middle of the underside toolbar.
Tips on how to Conceal the Navigation Bar and Backside Bar
Ranging from iOS 16, the toolbar modifier gives 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 choice for customers to cover/present the navigation bar, you possibly can declare a state variable like beneath:
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@State personal 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 ? “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 possibly can exchange .navigationBar with .bottomBar. Right here is an instance:
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.toolbar(.hidden, for: .bottomBar) |
Controlling the Visibility of Toolbar Background
SwiftUI gives one other modifier referred to as toolbarBackground for builders to manage 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 adjustments, you need to see a navigation bar with a blurred background when navigating to the element view.
Toolbar Coloration Scheme
You may exert further management over the colour scheme of the navigation bar or backside bar by using the toolbarColorScheme modifier. As an illustration, 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 beneath:
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.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 easy methods to populate objects in toolbars. Because the SwiftUI framework continues to evolve, it gives 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 study extra about SwiftUI, you possibly can take a look at our Mastering SwiftUI e book. It’s now totally up to date for Xcode 15 and iOS 17.