The Toolbar API has been out there 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 larger management over their look.
On this tutorial, let me present you find out how to work with toolbars and handle its customizations.
Utilizing the Toolbar Modifier to Populate Navigation Bar Objects
Whether or not you could populate objects in navigation bars or toolbars, you’ll be able to make the most of the .toolbar modifier to attain 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 normal buttons utilizing system photographs. 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 you could add extra objects to the navigation bar, you’ll be able to proceed so as to add buttons within the toolbar closure. Nevertheless, if you wish to management the location of the objects, you’ll be able to present a set 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("Cover 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’ll be able to 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’ll be able to 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.
Find out how to Cover the Navigation Bar and Backside Bar
Ranging from iOS 16, the toolbar modifier gives builders the power to handle the visibility of toolbars, together with the navigation bar and backside bar. To cover the navigation bar, you’ll be able to 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’ll be able to declare a state variable like beneath:
@State non-public var showNavBar = trueThen you’ll be able to replace the .toolbar modifier like this:
.toolbar {
.
.
.
ToolbarItem(placement: .standing) {
Button {
showNavBar.toggle()
} label: {
Textual content(showNavBar ? "Cover 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’ll be able to change .navigationBar with .bottomBar. Right here is an instance:
.toolbar(.hidden, for: .bottomBar)Controlling the Visibility of Toolbar Background
SwiftUI gives 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’ll be able to set the worth of toolbarBackground to .hidden:
.toolbarBackground(.hidden, for: .navigationBar)To make the background seen, you’ll be able to 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, you need 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. For example, to use darkish mode to the navigation bar of the element view, you’ll be able to 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 modifications to darkish mode.
Abstract
All through this tutorial, now we have lined the basics of the Toolbar APIs and explored find out how 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 be taught extra about SwiftUI, you’ll be able to try our Mastering SwiftUI ebook. It’s now totally up to date for Xcode 15 and iOS 17.
