Programmatically Scroll on SwiftUI

ProgrammaticallyScroll.swift

struct ContentView: View {
    let colors: [Color] = [.red, .green, .blue]
    @State
    var model = ScrollModel()

    var body: some View {
        NavigationStack {
            ScrollViewReader { value in
                List {
                    ForEach(model.ids, id: \.self) { i in
                        Text("Example \(i)")
                            .font(.title)
                            .frame(maxWidth: .infinity, minHeight: 80)
                            .background(colors[i % colors.count])
                    }
                }
                .toolbar {
                    ToolbarItem {
                        Button(action: {
                            model.start()
                        }, label: {
                            Text("start timer")
                        })
                    }
                }
                .navigationTitle("Auto Scroll")
                .onChange(of: model.forcusID) { oldValue, newValue in
                    withAnimation {
                        value.scrollTo(newValue, anchor: .top)
                    }
                }
            }
        }
    }
}

ScrollModel.swift

@Observable
final class ScrollModel {
    let ids = Array(0..<100)
    var forcusID: Int = 0

    func start() {
        Timer.scheduledTimer(withTimeInterval: 1.0, repeats: true) { timer in
            if let max = self.ids.max(), max >= self.forcusID {
                print(self.forcusID)
                self.forcusID = self.forcusID + 1

            }
        }
    }
}

2024-07-09.21.50.01.mov