Add App Lock settings screen (#1917)

ElementX/Sources/Screens/AppLock/AppLockScreen/View/AppLockScreen.swift

@@ -0,0 +1,57 @@
+//
+// Copyright 2022 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import Compound
+import SwiftUI
+
+// This implementation is only for development purposes.
+
+struct AppLockScreen: View {
+    @ObservedObject var context: AppLockScreenViewModel.Context
+    
+    var body: some View {
+        FullscreenDialog {
+            VStack(spacing: 8) {
+                AuthenticationIconImage(image: Image(systemSymbol: .lock))
+                    .symbolVariant(.fill)
+                    .padding(.bottom, 8)
+                
+                Text(UntranslatedL10n.screenAppLockTitle(InfoPlistReader.main.bundleDisplayName))
+                    .font(.compound.headingMDBold)
+                    .multilineTextAlignment(.center)
+                    .foregroundColor(.compound.textPrimary)
+            }
+        } bottomContent: {
+            Button(UntranslatedL10n.commonUnlock) {
+                context.send(viewAction: .submitPINCode("0000"))
+            }
+            .buttonStyle(.compound(.primary))
+        }
+    }
+}
+
+// MARK: - Previews
+
+// Add TestablePreview conformance once we have designs.
+struct AppLockScreen_Previews: PreviewProvider {
+    static let viewModel = AppLockScreenViewModel(appLockService: AppLockServiceMock.mock())
+    
+    static var previews: some View {
+        NavigationStack {
+            AppLockScreen(context: viewModel.context)
+        }
+    }
+}