Just learning Swift and SwiftUI, having fun in Xcode. I have the following custom view defined, but when I try to test it, the information doesn't get updated as I expect. When I use the button defined INSIDE the custom view, the update works as expected. When I use the button defined in the Preview body, it doesn't. The "lines" variable of the custom view appears not to be updated in that case. I know I'm missing something fundamental here about either view state binding or the preview environment, but I'm stumped. Any ideas? import SwiftUI struct ConsoleView: View { var maxLines : Int = 26 private enum someIDs { case textID} @State private var numLines : Int = 0 @State var lines = "a\nb\nc\n" var body: some View { VStack(alignment: .leading, spacing:0 ) { ScrollViewReader { proxy in ScrollView { Button("Scroll to Bottom") { withAnimation { proxy.scrollTo(someIDs.textID, anchor: .bottom) } } Text(lines) .id(someIDs.textID) .multilineTextAlignment(.leading) .frame(maxWidth: .infinity, alignment: .bottomLeading) .padding() .onChange ( of: lines) { withAnimation { proxy.scrollTo( someIDs.textID, anchor: .bottom) } } } Button("Add more") { writeln("More") //writeln(response) } } } } private func clipIfNeeded () { if (numLines>=maxLines) { if let i = lines.firstIndex(of: "\n") { lines = String(lines.suffix( from: lines.index(after:i))) } } } func writeln ( _ newText : String) { print("adding '\(newText)' to lines") //clipIfNeeded() write( newText ) write("\n") numLines += 1 print(lines) } func write ( _ newText : String) { lines += newText } } #Preview { VStack() { var myConsole = ConsoleView(lines: "x\ny\nz\n") myConsole Button("Add stuff") { myConsole.writeln("Stuff") } } }