Add UINavigationController to AppRTCMobile.

webrtc/examples/objc/AppRTCMobile/ios/ARDMainViewController.m

 /*
  *  Copyright 2015 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #import "ARDMainViewController.h"
 
 #import <AVFoundation/AVFoundation.h>
 
 #import "WebRTC/RTCDispatcher.h"
 #import "WebRTC/RTCLogging.h"
 #import "webrtc/modules/audio_device/ios/objc/RTCAudioSession.h"
 #import "webrtc/modules/audio_device/ios/objc/RTCAudioSessionConfiguration.h"
 
 #import "ARDAppClient.h"
 #import "ARDMainView.h"
 #import "ARDVideoCallViewController.h"
 
+static NSString *barButtonImageString = @"ic_settings_black_24dp.png";
+
 @interface ARDMainViewController () <
     ARDMainViewDelegate,
     ARDVideoCallViewControllerDelegate,
     RTCAudioSessionDelegate>
 @end
 
 @implementation ARDMainViewController {
   ARDMainView *_mainView;
   AVAudioPlayer *_audioPlayer;
   BOOL _useManualAudio;
 }
 
 - (void)loadView {
+  self.title = @"AppRTC Mobile";
   _mainView = [[ARDMainView alloc] initWithFrame:CGRectZero];
   _mainView.delegate = self;
   self.view = _mainView;
+  [self addSettingsBarButton];
 
   RTCAudioSessionConfiguration *webRTCConfig =
       [RTCAudioSessionConfiguration webRTCConfiguration];
   webRTCConfig.categoryOptions = webRTCConfig.categoryOptions |
       AVAudioSessionCategoryOptionDefaultToSpeaker;
   [RTCAudioSessionConfiguration setWebRTCConfiguration:webRTCConfig];
 
   RTCAudioSession *session = [RTCAudioSession sharedInstance];
   [session addDelegate:self];
 
   [self configureAudioSession];
   [self setupAudioPlayer];
 }
 
+- (void)addSettingsBarButton {
+  UIBarButtonItem *settingsButton =
+      [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:barButtonImageString]
+                                       style:UIBarButtonItemStylePlain
+                                      target:self
+                                      action:@selector(showSettings:)];
+  self.navigationItem.rightBarButtonItem = settingsButton;
+}
+
 #pragma mark - ARDMainViewDelegate
 
 - (void)mainView:(ARDMainView *)mainView
              didInputRoom:(NSString *)room
                isLoopback:(BOOL)isLoopback
               isAudioOnly:(BOOL)isAudioOnly
         shouldMakeAecDump:(BOOL)shouldMakeAecDump
     shouldUseLevelControl:(BOOL)shouldUseLevelControl
            useManualAudio:(BOOL)useManualAudio {
   if (!room.length) {
@@ skipping 84 matching lines @@
 - (void)audioSessionDidStopPlayOrRecord:(RTCAudioSession *)session {
   // WebRTC is done with the audio session. Restart playback.
   [RTCDispatcher dispatchAsyncOnType:RTCDispatcherTypeMain
                                block:^{
     RTCLog(@"audioSessionDidStopPlayOrRecord");
     [self restartAudioPlayerIfNeeded];
   }];
 }
 
 #pragma mark - Private
+- (void)showSettings:(id)sender {
+}
 
 - (void)configureAudioSession {
   RTCAudioSessionConfiguration *configuration =
       [[RTCAudioSessionConfiguration alloc] init];
   configuration.category = AVAudioSessionCategoryAmbient;
   configuration.categoryOptions = AVAudioSessionCategoryOptionDuckOthers;
   configuration.mode = AVAudioSessionModeDefault;
 
   RTCAudioSession *session = [RTCAudioSession sharedInstance];
   [session lockForConfiguration];
@@ skipping 34 matching lines @@
 - (void)showAlertWithMessage:(NSString*)message {
   UIAlertView* alertView = [[UIAlertView alloc] initWithTitle:nil
                                                       message:message
                                                      delegate:nil
                                             cancelButtonTitle:@"OK"
                                             otherButtonTitles:nil];
   [alertView show];
 }
 
 @end