SwiftUI - How to center a component in a horizontal ScrollView when tapped? - swift

Question

I have a horizontal ScrollView, and within it an HStack. It contains multiple Subviews, rendered by a ForEach. I want to make it so that when these Subviews are tapped, they become centered vertically in the view. For example, I have:
ScrollView(.horizontal) {
HStack(alignment: .center) {
Circle() // for demonstration purposes, let's say the subviews are circles
.frame(width: 50, height: 50)
Circle()
.frame(width: 50, height: 50)
Circle()
.frame(width: 50, height: 50)
}
.frame(width: UIScreen.main.bounds.size.width, alignment: .center)
}
I tried this code:
ScrollViewReader { scrollProxy in
ScrollView(.horizontal) {
HStack(alignment: .center) {
Circle()
.frame(width: 50, height: 50)
.id("someID3")
.frame(width: 50, height: 50)
.onTapGesture {
scrollProxy.scrollTo(item.id, anchor: .center)
}
Circle()
.frame(width: 50, height: 50)
.id("someID3")
.frame(width: 50, height: 50)
.onTapGesture {
scrollProxy.scrollTo(item.id, anchor: .center)
}
...
}
}
But it seemingly had no effect. Does anyone know how I can properly do this?

Answer 1

You can definitely do this with ScrollView and ScrollViewReader. However, I see a couple of things that could cause problems in your code sample:
You use the same id "someID3" twice.
I can't see where your item.id comes from, so I can't tell if it actually contains the same id ("someID3").
I don't know why you have two frames with the same bounds on the same view area. It shouldn't be a problem, but it's always best to keep things simple.
Here's a working example:
import SwiftUI
#main
struct MentalHealthLoggerApp: App {
var body: some Scene {
WindowGroup {
ScrollViewReader { scrollProxy in
ScrollView(.horizontal) {
HStack(alignment: .center, spacing: 10) {
Color.clear
.frame(width: (UIScreen.main.bounds.size.width - 70) / 2.0)
ForEach(Array(0..<10), id: \.self) { id in
ZStack(alignment: .center) {
Circle()
.foregroundColor(.primary.opacity(Double(id)/10.0))
Text("\(id)")
}
.frame(width: 50, height: 50)
.onTapGesture {
withAnimation {
scrollProxy.scrollTo(id, anchor: .center)
}
}
.id(id)
}
Color.clear
.frame(width: (UIScreen.main.bounds.size.width - 70) / 2.0)
}
}
}
}
}
}
Here you can see it in action:
[EDIT: You might have to click on it if the GIF won't play automatically.]
Note that I added some empty space to both ends of the ScrollView, so it's actually possible to center the first and last elements as ScrollViewProxy will never scroll beyond limits.

Answer 2

Created a custom ScrollingHStack and using geometry reader and a bit calculation, here is what we have:
struct ContentView: View {
var body: some View {
ScrollingHStack(space: 10, height: 50)
}
}
struct ScrollingHStack: View {
var space: CGFloat
var height: CGFloat
var colors: [Color] = [.blue, .green, .yellow]
#State var dragOffset = CGSize.zero
var body: some View {
GeometryReader { geometry in
HStack(spacing: space) {
ForEach(0..<15, id: \.self) { index in
Circle()
.fill(colors[index % 3])
.frame(width: height, height: height)
.overlay(Text("\(Int(dragOffset.width))"))
.onAppear {
dragOffset.width = geometry.size.width / 2 - ((height + space) / 2)
}
.onTapGesture {
let totalItems = height * CGFloat(index)
let totalspace = space * CGFloat(index)
withAnimation {
dragOffset.width = (geometry.size.width / 2) - (totalItems + totalspace) - ((height + space) / 2)
}
}
}
}
.offset(x: dragOffset.width)
.gesture(DragGesture()
.onChanged({ dragOffset = $0.translation})
)
}
}
}