In iOS 16, apart from introducing the brand new NavigationStack, Apple additionally launched a brand new view container named NavigationSplitView for builders to create two or three column navigation interface. If you wish to construct UI just like the inventory Mail app, you need to try this cut up view part.
Whereas NavigationSplitView is extra appropriate for iPadOS and macOS apps, it’s also possible to apply it to apps for iPhone. The view part mechanically adapts itself for iPhone. As a substitute of displaying a multi-column interface, it creates a single-column expertise.
The brand new NavigationSplitView comes with varied choices so that you can customise its look and operations. You may change the column width and programmatically present/disguise the columns.
On this tutorial, we are going to create a three-column navigation UI utilizing NavigationSplitView.
Let’s get began.
The Fundamental Utilization of NavigationSplitView
The NavigationSplitView helps each two-column and three-column navigation expertise. Their implementations are fairly related. To create a two-column navigation UI, you write the code like this:
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NavigationSplitView { Â Â // Menu bar } element: { Â Â // Element view for every of the menu merchandise } |
For 3-column navigation interface, you add the content material parameter in between:
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NavigationSplitView { Â Â // Menu bar } content material: { Â Â // Sub menu } element: { Â Â // Element view for every of the sub-menu merchandise } |
We’ll begin with the two-column navigation UI and finally construct the three-column design.
Constructing the 2-Column Navigation Interface
In case you’ve learn my earlier tutorial on the expandable listing view, you might know that I’m an enormous fan of La Marzocco. In that tutorial, I confirmed you how one can create an expandable listing view with inset group type.
Now let’s flip this expandable listing right into a two stage navigation interface just like the screenshot proven beneath:
Earlier than we create the cut up view, let’s start with the info mannequin. We create a struct to mannequin a menu merchandise:
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struct MenuItem: Identifiable, Hashable {     var id = UUID()     var title: String     var picture: String     var subMenuItems: [MenuItem]? } |
To make a nested listing, the important thing right here is to incorporate a property that incorporates an non-obligatory array of youngsters (i.e. subMenuItems). Be aware that the youngsters are of the identical kind of its guardian.
For the highest stage menu gadgets, we are able to create an array of MenuItem like this:
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let topMenuItems = [ MenuItem(name: “Espresso Machines”, image: “linea-mini”, subMenuItems: espressoMachineMenuItems), Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â MenuItem(name: “Grinders”, image: “swift-mini”, subMenuItems: grinderMenuItems), Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â MenuItem(name: “Other Equipments”, image: “espresso-ep”, subMenuItems: otherMenuItems) Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ] |
For every of the menu merchandise, we specify the array of the sub-menu gadgets. In case if there isn’t any sub-menu merchandise, you possibly can omit the subMenuItems parameter or go it a nil worth. For the sub-menu gadgets, we are able to outline them like this:
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// Sub-menu gadgets for Espressco Machines let espressoMachineMenuItems = [ MenuItem(name: “Leva”, image: “leva-x”, subMenuItems: [ MenuItem(name: “Leva X”, image: “leva-x”), MenuItem(name: “Leva S”, image: “leva-s”) ]), Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â MenuItem(title: “Strada”, picture: “strada-ep”, subMenuItems: [ MenuItem(name: “Strada EP”, image: “strada-ep”), MenuItem(name: “Strada AV”, image: “strada-av”), MenuItem(name: “Strada MP”, image: “strada-mp”), MenuItem(name: “Strada EE”, image: “strada-ee”) ]), Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â MenuItem(title: “KB90”, picture: “kb90”), Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â MenuItem(title: “Linea”, picture: “linea-pb-x”, subMenuItems: [ MenuItem(name: “Linea PB X”, image: “linea-pb-x”), MenuItem(name: “Linea PB”, image: “linea-pb”), MenuItem(name: “Linea Classic”, image: “linea-classic”) ]), Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â MenuItem(title: “GB5”, picture: “gb5”), Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â MenuItem(title: “Dwelling”, picture: “gs3”, subMenuItems: [ MenuItem(name: “GS3”, image: “gs3”), MenuItem(name: “Linea Mini”, image: “linea-mini”) ]) Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ] Â // Sub-menu gadgets for Grinder let grinderMenuItems = [ MenuItem(name: “Swift”, image: “swift”), Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â MenuItem(name: “Vulcano”, image: “vulcano”), Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â MenuItem(name: “Swift Mini”, image: “swift-mini”), Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â MenuItem(name: “Lux D”, image: “lux-d”) Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ] Â // Sub-menu gadgets for different tools let otherMenuItems = [ MenuItem(name: “Espresso AV”, image: “espresso-av”), Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â MenuItem(name: “Espresso EP”, image: “espresso-ep”), Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â MenuItem(name: “Pour Over”, image: “pourover”), Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â MenuItem(name: “Steam”, image: “steam”) Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ] |
To higher manage the info mannequin, we create a struct referred to as CoffeeEquipmentModel like this:
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struct CoffeeEquipmenModel {     let mainMenuItems = {         // High menu gadgets         let topMenuItems = [ MenuItem(name: “Espresso Machines”, image: “linea-mini”, subMenuItems: espressoMachineMenuItems),                                 MenuItem(name: “Grinders”, image: “swift-mini”, subMenuItems: grinderMenuItems),                                 MenuItem(name: “Other Equipments”, image: “espresso-ep”, subMenuItems: otherMenuItems)                             ]          // Sub-menu gadgets for Espresso Machines         let espressoMachineMenuItems = [ MenuItem(name: “Leva”, image: “leva-x”, subMenuItems: [ MenuItem(name: “Leva X”, image: “leva-x”), MenuItem(name: “Leva S”, image: “leva-s”) ]),                                         MenuItem(title: “Strada”, picture: “strada-ep”, subMenuItems: [ MenuItem(name: “Strada EP”, image: “strada-ep”), MenuItem(name: “Strada AV”, image: “strada-av”), MenuItem(name: “Strada MP”, image: “strada-mp”), MenuItem(name: “Strada EE”, image: “strada-ee”) ]),                                         MenuItem(title: “KB90”, picture: “kb90”),                                         MenuItem(title: “Linea”, picture: “linea-pb-x”, subMenuItems: [ MenuItem(name: “Linea PB X”, image: “linea-pb-x”), MenuItem(name: “Linea PB”, image: “linea-pb”), MenuItem(name: “Linea Classic”, image: “linea-classic”) ]),                                         MenuItem(title: “GB5”, picture: “gb5”),                                         MenuItem(title: “Dwelling”, picture: “gs3”, subMenuItems: [ MenuItem(name: “GS3”, image: “gs3”), MenuItem(name: “Linea Mini”, image: “linea-mini”) ])                                         ]          // Sub-menu gadgets for Grinder         let grinderMenuItems = [ MenuItem(name: “Swift”, image: “swift”),                                 MenuItem(name: “Vulcano”, image: “vulcano”),                                 MenuItem(name: “Swift Mini”, image: “swift-mini”),                                 MenuItem(name: “Lux D”, image: “lux-d”)                                 ]          // Sub-menu gadgets for different tools         let otherMenuItems = [ MenuItem(name: “Espresso AV”, image: “espresso-av”),                                 MenuItem(name: “Espresso EP”, image: “espresso-ep”),                                 MenuItem(name: “Pour Over”, image: “pourover”),                                 MenuItem(name: “Steam”, image: “steam”)                                 ]          return topMenuItems     }()      func subMenuItems(for id: MenuItem.ID) –> [MenuItem]? {         guard let menuItem = mainMenuItems.first(the place: { $0.id == id }) else {             return nil         }          return menuItem.subMenuItems     }      func menuItem(for categoryID: MenuItem.ID, itemID: MenuItem.ID) –> MenuItem? {          guard let subMenuItems = subMenuItems(for: categoryID) else {             return nil         }          guard let menuItem = subMenuItems.first(the place: { $0.id == itemID }) else {             return nil         }          return menuItem     } } |
The mainMenuItems array holds the pattern menu gadgets. Each subMenuItems and menuItem are helper strategies for trying up a particular class or menu merchandise.
Now that we’ve ready the info mannequin, let’s transfer onto the implementation of the navigation cut up view. Create a brand new file named TwoColumnSplitView.swift utilizing the SwiftUI view template. Replace the TwoColumnSplitView struct like this:
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struct TwoColumnSplitView: View {      @State non-public var selectedCategoryId: MenuItem.ID?      non-public var dataModel = CoffeeEquipmenModel()      var physique: some View {         NavigationSplitView {             Listing(dataModel.mainMenuItems, choice: $selectedCategoryId) { merchandise in                 HStack {                     Picture(merchandise.picture)                         .resizable()                         .scaledToFit()                         .body(width: 50, peak: 50)                     Textual content(merchandise.title)                         .font(.system(.title3, design: .rounded))                         .daring()                 }             }              .navigationTitle(“Espresso”)          } element: {             if let selectedCategoryId,               let categoryItems = dataModel.subMenuItems(for: selectedCategoryId) {                  Listing(categoryItems) { merchandise in                     HStack {                         Picture(merchandise.picture)                             .resizable()                             .scaledToFit()                             .body(width: 50, peak: 50)                         Textual content(merchandise.title)                             .font(.system(.title3, design: .rounded))                             .daring()                     }                 }                 .listStyle(.plain)                 .navigationBarTitleDisplayMode(.inline)              } else {                 Textual content(“Please choose a class”)             }         }      } } |
The primary closure of NavigationSplitView presents the primary menu merchandise. We use a Listing view to loop via all mainMenuItems within the information mannequin and show every of the menu gadgets utilizing a HStack view.
We even have a state variable named selectedCategoryId, which is used to carry the chosen predominant menu merchandise.
For the element closure, that is the place the submenu merchandise is rendered. If a class is chosen, we name the subMenuItems methodology to get the submenu gadgets for that individual class. We then show the submenu gadgets utilizing Listing view. Conversely, if no class is chosen, we show a textual content message instructing the person to decide on a class.
When you made the adjustments, you need to see a two-column navigation UI within the Xcode preview.
Making a Three-Column Navigation Interface
Now that we’ve created a two-column navigation interface, let’s additional improve it to supply customers with a three-column navigation expertise. The additional column is used for displaying the picture of the chosen tools.
To transform the two-column navigation interface to three-column, we have to implement an extra parameter (i.e. content material) for the NavigationSplitView. Let’s create a brand new view named ThreeColumnSplitView like this:
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struct ThreeColumnSplitView: View {     @State non-public var selectedCategoryId: MenuItem.ID?     @State non-public var selectedItem: MenuItem?      non-public var dataModel = CoffeeEquipmenModel()      var physique: some View {         NavigationSplitView {              Listing(dataModel.mainMenuItems, choice: $selectedCategoryId) { merchandise in                 HStack {                     Picture(merchandise.picture)                         .resizable()                         .scaledToFit()                         .body(width: 50, peak: 50)                     Textual content(merchandise.title)                         .font(.system(.title3, design: .rounded))                         .daring()                 }             }              .navigationTitle(“Espresso”)         } content material: {              if let selectedCategoryId,               let subMenuItems = dataModel.subMenuItems(for: selectedCategoryId) {                 Listing(subMenuItems, choice: $selectedItem) { merchandise in                     NavigationLink(worth: merchandise) {                         HStack {                             Picture(merchandise.picture)                                 .resizable()                                 .scaledToFit()                                 .body(width: 50, peak: 50)                             Textual content(merchandise.title)                                 .font(.system(.title3, design: .rounded))                                 .daring()                         }                     }                 }                 .listStyle(.plain)                 .navigationBarTitleDisplayMode(.inline)              } else {                 Textual content(“Please choose a menu merchandise”)             }          } element: {             if let selectedItem {                 Picture(selectedItem.picture)                     .resizable()                     .scaledToFit()             } else {                 Textual content(“Please choose an merchandise”)             }         }      } } |
Principally, the code within the content material closure ought to be similar to you. The content material parameter is designed for displaying the submenu gadgets. Thus, we use the Listing view to indicate the submenu gadgets for the chosen class.
When an merchandise is chosen within the submenu, the app exhibits the tools picture. That is achieved by the code written within the element closure.
After the code adjustments, the preview pane ought to present you a two-column format.
By default, the primary column is hidden. It’s essential faucet the menu button on the top-left nook to disclose it.
To manage the visibility of the cut up view, you possibly can declare a state variable of the sort NavigationSplitViewVisibility and set its worth to .all:
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@State non-public var columnVisibility = NavigationSplitViewVisibility.all |
When instantiating the NavigationSplitView, it has an choice parameter named columnVisibility. You may merely go the binding of columnVisibility to regulate the visibility of the columns.
The NavigationSplitViewVisibility.all worth tells iPadOS to show all of the three columns. There are different choices together with:
.computerized– Use the default main column visibility for the present machine. That is the default setting..doubleColumn– Present the content material column and element space of a three-column navigation cut up view..detailOnly– Cover the main two columns of a three-column cut up view. In different phrases, solely the element space exhibits.
Customizing the Model of Navigation Cut up Views
Have you ever examined the app in iPad Portrait? By default, the element space takes up the entire display screen when the iPad machine is in portrait mode. So, once you convey up the primary menu and submenu areas, the element space is hidden behind these two main columns.
In case you don’t like this type, you possibly can change it by attaching the .navigationSplitViewStyle modifier to NavigationSplitView:
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NavigationSplitView(columnVisibility: $columnVisibility) { Â Â . Â Â . Â Â . } .navigationSplitViewStyle(.balanced) |
The default worth is ready to .computerized. In case you set the worth to .balanced, it reduces the element space such that the 2 main columns can seem on the similar time.
What’s Subsequent
This tutorial offers you an introduction to NavigationSplitView in iOS 16. It’s very straightforward to create multi-column navigation expertise for iPad customers. Even in the event you develop apps for iPhone customers, NavigationSplitView can adapt itself to suit the navigation expertise on narrower screens. For instance, when iPhone 13 Professional Max is in portrait mode, the cut up view exhibits a one-column navigation. In case you rotate the machine sideway, the cut up view adjustments to a multi-column format.
Subsequently, take a while to check this cut up view part and apply it to your app every time this type of UI is sensible.
For reference, if you wish to be taught extra about NavigationSplitView, you possibly can try this WWDC video.
In case you take pleasure in this text and need to dive deeper into SwiftUI, you might try our Mastering SwiftUI book.
