Switch to gRPC client in Swift app

Apple/UI/MenuItemToggleView.swift

@@ -0,0 +1,67 @@
+//
+//  MenuItemToggleView.swift
+//  App
+//
+//  Created by Thomas Stubblefield on 5/13/23.
+//
+
+import SwiftUI
+
+public struct MenuItemToggleView: View {
+    @Environment(\.tunnel)
+    var tunnel: Tunnel
+
+    public var body: some View {
+        HStack {
+            VStack(alignment: .leading) {
+                Text("Burrow")
+                    .font(.headline)
+                Text(tunnel.status.description)
+                    .font(.subheadline)
+            }
+            Spacer()
+            Toggle(isOn: tunnel.toggleIsOn) {
+            }
+                .disabled(tunnel.toggleDisabled)
+                .toggleStyle(.switch)
+        }
+        .accessibilityElement(children: .combine)
+        .padding(.horizontal, 4)
+        .padding(10)
+        .frame(minWidth: 300, minHeight: 32, maxHeight: 32)
+    }
+
+    public init() {
+    }
+}
+
+extension Tunnel {
+    @MainActor fileprivate var toggleDisabled: Bool {
+        switch status {
+        case .disconnected, .permissionRequired, .connected, .disconnecting:
+            false
+        case .unknown, .disabled, .connecting, .reasserting, .invalid, .configurationReadWriteFailed:
+            true
+        }
+    }
+
+    @MainActor var toggleIsOn: Binding<Bool> {
+        Binding {
+            switch status {
+            case .connecting, .reasserting, .connected:
+                true
+            default:
+                false
+            }
+        } set: { newValue in
+            switch (status, newValue) {
+            case (.permissionRequired, true):
+                enable()
+            case (_, true):
+                start()
+            case (_, false):
+                stop()
+            }
+        }
+    }
+}