refactor files, auto-scrollback for messages (#256)

apps/ios/Shared/Views/UserSettings/SettingsButton.swift

@@ -0,0 +1,36 @@
+//
+//  SettingsButton.swift
+//  SimpleX
+//
+//  Created by Evgeny Poberezkin on 31/01/2022.
+//  Copyright © 2022 SimpleX Chat. All rights reserved.
+//
+
+import SwiftUI
+
+struct SettingsButton: View {
+    @EnvironmentObject var chatModel: ChatModel
+    @State private var showSettings = false
+
+    var body: some View {
+        Button { showSettings = true } label: {
+            Image(systemName: "gearshape")
+        }
+        .sheet(isPresented: $showSettings, content: {
+            SettingsView()
+                .onAppear {
+                    do {
+                        chatModel.userAddress = try apiGetUserAddress()
+                    } catch {
+                        print(error)
+                    }
+                }
+        })
+    }
+}
+
+struct SettingsButton_Previews: PreviewProvider {
+    static var previews: some View {
+        SettingsButton()
+    }
+}