I am trying to make a SwiftUI ScrollView
scroll to a certain point in an abstracted view when a button is pressed in a view which is calling the abstracted view programmatically. Here is my code:
struct AbstractedView: View {
@Namespace var view2ID
var body: some View {
ScrollView {
VStack {
View1()
View2()
.id(view2ID)
View3()
}
}
}
func scrollToView2(_ proxy: ScrollViewProxy) {
proxy.scrollTo(view2ID, anchor: .topTrailing)
}
}
As you can see, when scrollToView2()
is called (in a ScrollViewReader
), the AbstractedView
scrolls to view2ID
. I am creating a number of AbstractedView
's programmatically in a different View:
struct HigherView: View {
var numAbstractedViewsToMake: Int
var body: some View {
VStack {
HStack {
ForEach (0..<numAbstractedViewsToMake, id: \.self) { _ in
AbstractedView()
}
}
Text("button")
.onTapGesture {
/* call each AbstractedView.scrollToView2()
}
}
}
}
If I stored these views in an array in a struct inside my HigherView
with a ScrollViewReader
for each AbstractedView
would that work? I feel as though there has to be a nicer way to achieve this, I just have no clue how to do it. I am new to Swift so thank you for any help.
P.S. I have heard about UIKit but I don't know anything about it, is this the right time to be using that?
CodePudding user response:
Using the comments from @Asperi and @jnpdx, I was able to come up with a more powerful solution than I needed:
class ScrollToModel: ObservableObject {
enum Action {
case end
case top
}
@Published var direction: Action? = nil
}
struct HigherView: View {
@StateObject var vm = ScrollToModel()
var numAbstractedViewsToMake: Int
var body: some View {
VStack {
HStack {
Button(action: { vm.direction = .top }) { // < here
Image(systemName: "arrow.up.to.line")
.padding(.horizontal)
}
Button(action: { vm.direction = .end }) { // << here
Image(systemName: "arrow.down.to.line")
.padding(.horizontal)
}
}
Divider()
HStack {
ForEach(0..<numAbstractedViewsToMake, id: \.self) { _ in
ScrollToModelView(vm: vm)
}
}
}
}
}
struct AbstractedView: View {
@ObservedObject var vm: ScrollToModel
let items = (0..<200).map { $0 } // this is his demo
var body: some View {
VStack {
ScrollViewReader { sp in
ScrollView {
LazyVStack { // this bit can be changed accordingly
ForEach(items, id: \.self) { item in
VStack(alignment: .leading) {
Text("Item \(item)").id(item)
Divider()
}.frame(maxWidth: .infinity).padding(.horizontal)
}
}.onReceive(vm.$direction) { action in
guard !items.isEmpty else { return }
withAnimation {
switch action {
case .top:
sp.scrollTo(items.first!, anchor: .top)
case .end:
sp.scrollTo(items.last!, anchor: .bottom)
default:
return
}
}
}
}
}
}
}
}
Thank you both!