The Toolbar API has been accessible for a substantial interval, having been launched with the discharge of iOS 14. It was a precious 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 higher 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 is advisable 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 {
Record(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 ordinary buttons utilizing system photographs. 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 may proceed so as to add buttons within the toolbar closure. Nevertheless, if you wish to management the position of the objects, you may present a group of views with every view wrapped in a ToolbarItem. Beneath is an instance:
.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 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.
How one can Conceal 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 may insert the toolbar modifier inside NavigationStack like this:
.toolbar(.hidden, for: .navigationBar)If you wish to present an choice for customers to cover/present the navigation bar, you may declare a state variable like under:
@State non-public var showNavBar = trueThen 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 exchange .navigationBar with .bottomBar. Right here is an instance:
.toolbar(.hidden, for: .bottomBar)Controlling the Visibility of Toolbar Background
SwiftUI provides 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 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:
Record(1..<10, id: .self) { index in
NavigationLink("Merchandise (index)") {
Picture("legomen")
.resizable()
.ignoresSafeArea()
.toolbarBackground(.seen, for: .navigationBar)
}
}After making the code modifications, it’s best to see a navigation bar with a blurred background when navigating to the element view.
Toolbar Colour Scheme
You’ll be able to exert extra 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 may apply the toolbarColorScheme modifier to the Picture view as demonstrated under:
.toolbarColorScheme(.darkish, for: .navigationBar)Now, if you navigate to the element view, the navigation bar modifications to darkish mode.
Abstract
All through this tutorial, we’ve got coated the basics of the Toolbar APIs and explored how one can 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 study extra about SwiftUI, you may take a look at our Mastering SwiftUI e book. It’s now totally up to date for Xcode 15 and iOS 17.
