Propagate bitrate setting to RTCRtpSender.

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

 /*
  *  Copyright 2016 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 "ARDSettingsViewController.h"
 #import "ARDSettingsModel.h"
 
 NS_ASSUME_NONNULL_BEGIN
 
 typedef NS_ENUM(int, ARDSettingsSections) {
   ARDSettingsSectionMediaConstraints = 0,
   ARDSettingsSectionBitRate
 };
 
-@interface ARDSettingsViewController () {
+@interface ARDSettingsViewController () <UITextFieldDelegate> {
   ARDSettingsModel *_settingsModel;
 }
 
 @end
 
 @implementation ARDSettingsViewController
 
 - (instancetype)initWithStyle:(UITableViewStyle)style
                 settingsModel:(ARDSettingsModel *)settingsModel {
   self = [super initWithStyle:style];
@@ skipping 161 matching lines @@
 - (UITableViewCell *)bitrateTableViewCellForTableView:(UITableView *)tableView
                                           atIndexPath:(NSIndexPath *)indexPath {
   NSString *dequeueIdentifier = @"ARDSettingsBitrateCellIdentifier";
   UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:dequeueIdentifier];
   if (!cell) {
     cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault
                                   reuseIdentifier:dequeueIdentifier];
 
     UITextField *textField = [[UITextField alloc]
         initWithFrame:CGRectMake(10, 0, cell.bounds.size.width - 20, cell.bounds.size.height)];
+    NSString *currentMaxBitrate = [_settingsModel currentMaxBitrateSettingFromStore].stringValue;
+    textField.text = currentMaxBitrate;
     textField.placeholder = @"Enter max bit rate (kbps)";
     textField.keyboardType = UIKeyboardTypeNumberPad;
+    textField.delegate = self;
 
     // Numerical keyboards have no return button, we need to add one manually.
     UIToolbar *numberToolbar =
         [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, self.view.bounds.size.width, 50)];
     numberToolbar.items = @[
       [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace
                                                     target:nil
                                                     action:nil],
       [[UIBarButtonItem alloc] initWithTitle:@"Apply"
                                        style:UIBarButtonItemStyleDone
                                       target:self
                                       action:@selector(numberTextFieldDidEndEditing:)]
     ];
     [numberToolbar sizeToFit];
 
     textField.inputAccessoryView = numberToolbar;
     [cell addSubview:textField];
   }
   return cell;
 }
 
 - (void)numberTextFieldDidEndEditing:(id)sender {
   [self.view endEditing:YES];
 }
 
+- (void)textFieldDidEndEditing:(UITextField *)textField {
+  NSNumber *bitrateNumber = nil;
+
+  if (textField.text.length != 0) {
+    bitrateNumber = [NSNumber numberWithInteger:textField.text.intValue];
+  }
+
+  [_settingsModel storeMaxBitrateSetting:bitrateNumber];
+}
+
 @end
 NS_ASSUME_NONNULL_END