Is there any way to make a paged ScrollView in SwiftUI? - uiscrollview

Question

I've been looking through the docs with each beta but haven't seen a way to make a traditional paged ScrollView. I'm not familiar with AppKit so I am wondering if this doesn't exist in SwiftUI because it's primarily a UIKit construct. Anyway, does anyone have an example of this, or can anyone tell me it's definitely impossible so I can stop looking and roll my own?

Answer 1

You can now use a TabView and set the .tabViewStyle to PageTabViewStyle()
TabView {
View1()
View2()
View3()
}
.tabViewStyle(PageTabViewStyle())

Answer 2

As of Beta 3 there is no native SwiftUI API for paging. I've filed feedback and recommend you do the same. They changed the ScrollView API from Beta 2 to Beta 3 and I wouldn't be surprised to see a further update.
It is possible to wrap a UIScrollView in order to provide this functionality now. Unfortunately, you must wrap the UIScrollView in a UIViewController, which is further wrapped in UIViewControllerRepresentable in order to support SwiftUI content.
Gist here
class UIScrollViewViewController: UIViewController {
lazy var scrollView: UIScrollView = {
let v = UIScrollView()
v.isPagingEnabled = true
return v
}()
var hostingController: UIHostingController<AnyView> = UIHostingController(rootView: AnyView(EmptyView()))
override func viewDidLoad() {
super.viewDidLoad()
self.view.addSubview(self.scrollView)
self.pinEdges(of: self.scrollView, to: self.view)
self.hostingController.willMove(toParent: self)
self.scrollView.addSubview(self.hostingController.view)
self.pinEdges(of: self.hostingController.view, to: self.scrollView)
self.hostingController.didMove(toParent: self)
}
func pinEdges(of viewA: UIView, to viewB: UIView) {
viewA.translatesAutoresizingMaskIntoConstraints = false
viewB.addConstraints([
viewA.leadingAnchor.constraint(equalTo: viewB.leadingAnchor),
viewA.trailingAnchor.constraint(equalTo: viewB.trailingAnchor),
viewA.topAnchor.constraint(equalTo: viewB.topAnchor),
viewA.bottomAnchor.constraint(equalTo: viewB.bottomAnchor),
])
}
}
struct UIScrollViewWrapper<Content: View>: UIViewControllerRepresentable {
var content: () -> Content
init(#ViewBuilder content: #escaping () -> Content) {
self.content = content
}
func makeUIViewController(context: Context) -> UIScrollViewViewController {
let vc = UIScrollViewViewController()
vc.hostingController.rootView = AnyView(self.content())
return vc
}
func updateUIViewController(_ viewController: UIScrollViewViewController, context: Context) {
viewController.hostingController.rootView = AnyView(self.content())
}
}
And then to use it:
var body: some View {
GeometryReader { proxy in
UIScrollViewWrapper {
VStack {
ForEach(0..<1000) { _ in
Text("Hello world")
}
}
.frame(width: proxy.size.width) // This ensures the content uses the available width, otherwise it will be pinned to the left
}
}
}

Answer 3

Apple's official tutorial covers this as an example. I find it easy to follow and suitable for my case. I really recommend you check this out and try to understand how to interface with UIKit. Since SwiftUI is so young, not every feature in UIKit would be covered at this moment. Interfacing with UIKit should address most if not all needs.
https://developer.apple.com/tutorials/swiftui/interfacing-with-uikit

Answer 4

Not sure if this helps your question but for the time being while Apple is working on adding a Paging View in SwiftUI I've written a utility library that gives you a SwiftUI feel while using a UIPageViewController under the hood tucked away.
You can use it like this:
Pages {
Text("Page 1")
Text("Page 2")
Text("Page 3")
Text("Page 4")
}
Or if you have a list of models in your application you can use it like this:
struct Car {
var model: String
}
let cars = [Car(model: "Ford"), Car(model: "Ferrari")]
ModelPages(cars) { index, car in
Text("The \(index) car is a \(car.model)")
.padding(50)
.foregroundColor(.white)
.background(Color.blue)
.cornerRadius(10)
}

Answer 5

You can simply track state using .onAppear() to load your next page.
struct YourListView : View {
#ObservedObject var viewModel = YourViewModel()
let numPerPage = 50
var body: some View {
NavigationView {
List(viewModel.items) { item in
NavigationLink(destination: DetailView(item: item)) {
ItemRow(item: item)
.onAppear {
if self.shouldLoadNextPage(currentItem: item) {
self.viewModel.fetchItems(limitPerPage: self.numPerPage)
}
}
}
}
.navigationBarTitle(Text("Items"))
.onAppear {
guard self.viewModel.items.isEmpty else { return }
self.viewModel.fetchItems(limitPerPage: self.numPerPage)
}
}
}
private func shouldLoadNextPage(currentItem item: Item) -> Bool {
let currentIndex = self.viewModel.items.firstIndex(where: { $0.id == item.id } )
let lastIndex = self.viewModel.items.count - 1
let offset = 5 //Load next page when 5 from bottom, adjust to meet needs
return currentIndex == lastIndex - offset
}
}
class YourViewModel: ObservableObject {
#Published private(set) items = [Item]()
// add whatever tracking you need for your paged API like next/previous and count
private(set) var fetching = false
private(set) var next: String?
private(set) var count = 0
func fetchItems(limitPerPage: Int = 30, completion: (([Item]?) -> Void)? = nil) {
// Do your stuff here based on the API rules for paging like determining the URL etc...
if items.count == 0 || items.count < count {
let urlString = next ?? "https://somePagedAPI?limit=/(limitPerPage)"
fetchNextItems(url: urlString, completion: completion)
} else {
completion?(pokemon)
}
}
private func fetchNextItems(url: String, completion: (([Item]?) -> Void)?) {
guard !fetching else { return }
fetching = true
Networking.fetchItems(url: url) { [weak self] (result) in
DispatchQueue.main.async { [weak self] in
self?.fetching = false
switch result {
case .success(let response):
if let count = response.count {
self?.count = count
}
if let newItems = response.results {
self?.items += newItems
}
self?.next = response.next
case .failure(let error):
// Error state tracking not implemented but would go here...
os_log("Error fetching data: %#", error.localizedDescription)
}
}
}
}
}
Modify to fit whatever API you are calling and handle errors based on your app architecture.

Answer 6

Checkout SwiftUIPager. It's a pager built on top of SwiftUI native components:

Answer 7

If you would like to exploit the new PageTabViewStyle of TabView, but you need a vertical paged scroll view, you can make use of effect modifiers like .rotationEffect().
Using this method I wrote a library called VerticalTabView 🔝 that turns a TabView vertical just by changing your existing TabView to VTabView.

Answer 8

You can use such custom modifier:
struct ScrollViewPagingModifier: ViewModifier {
func body(content: Content) -> some View {
content
.onAppear {
UIScrollView.appearance().isPagingEnabled = true
}
.onDisappear {
UIScrollView.appearance().isPagingEnabled = false
}
}
}
extension ScrollView {
func isPagingEnabled() -> some View {
modifier(ScrollViewPagingModifier())
}
}

Answer 9

To simplify Lorenzos answer, you can basically add UIScrollView.appearance().isPagingEnabled = true to your scrollview as below:
VStack{
ScrollView(showsIndicators: false){
VStack(spacing: 0){ // to remove spacing between rows
ForEach(1..<10){ i in
ZStack{
Text(String(i))
Circle()
} .frame(width: UIScreen.main.bounds.width, height: UIScreen.main.bounds.height)
}
}
}.onAppear {
UIScrollView.appearance().isPagingEnabled = true
}
.onDisappear {
UIScrollView.appearance().isPagingEnabled = false
}
}