Upstream ios/showcase source code.

ios/showcase/core/app_delegate.mm

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import "ios/showcase/core/app_delegate.h"
+
+#import "ios/showcase/core/showcase_model.h"
+#import "ios/showcase/core/showcase_view_controller.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+@implementation AppDelegate
+@synthesize window = _window;
+
+- (BOOL)application:(UIApplication*)application
+    didFinishLaunchingWithOptions:(NSDictionary*)launchOptions {
+  // Override point for customization after application launch.
+  self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
+  ShowcaseViewController* viewController =
+      [[ShowcaseViewController alloc] initWithRows:[self rowsToDisplay]];
+  UINavigationController* navigationController = [[UINavigationController alloc]
+      initWithRootViewController:viewController];
+  self.window.rootViewController = navigationController;
+  [self.window makeKeyAndVisible];
+  return YES;
+}
+
+#pragma mark - Private
+
+// Creates model data to display in the view controller.
+- (NSArray<showcase::ModelRow*>*)rowsToDisplay {
+  NSArray<showcase::ModelRow*>* rows = [ShowcaseModel model];
+  NSSortDescriptor* sortDescriptor =
+      [NSSortDescriptor sortDescriptorWithKey:showcase::kClassForDisplayKey
+                                    ascending:YES];
+  return [rows sortedArrayUsingDescriptors:@[ sortDescriptor ]];
+}
+
+@end