iOS stability improvement for device switching

webrtc/examples/objc/AppRTCDemo/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 "ARDAppClient.h"
 #import "ARDMainView.h"
 #import "ARDVideoCallViewController.h"
 
 @interface ARDMainViewController () <ARDMainViewDelegate>
 @end
 
 @implementation ARDMainViewController
 
 - (void)loadView {
   ARDMainView *mainView = [[ARDMainView alloc] initWithFrame:CGRectZero];
   mainView.delegate = self;
   self.view = mainView;
 }
 
 - (void)applicationWillResignActive:(UIApplication *)application {
   // Terminate any calls when we aren't active.
-  [self dismissViewControllerAnimated:NO completion:nil];
+  // [self dismissViewControllerAnimated:NO completion:nil];

[henrika_webrtc, 2016/01/04 15:58:51]

This part will not be part of the final CL, hence not checked in.

 }
 
 #pragma mark - ARDMainViewDelegate
 
 - (void)mainView:(ARDMainView *)mainView
     didInputRoom:(NSString *)room
       isLoopback:(BOOL)isLoopback
      isAudioOnly:(BOOL)isAudioOnly {
   if (!room.length) {
     [self showAlertWithMessage:@"Missing room name."];
@@ skipping 41 matching lines @@
 - (void)showAlertWithMessage:(NSString*)message {
   UIAlertView* alertView = [[UIAlertView alloc] initWithTitle:nil
                                                       message:message
                                                      delegate:nil
                                             cancelButtonTitle:@"OK"
                                             otherButtonTitles:nil];
   [alertView show];
 }
 
 @end