Structure project almost by features. Start by organizing view controllers.

Riot/Modules/Integrations/Widgets/StickerPicker/StickerPickerViewController.m

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+/*
+ Copyright 2018 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 "StickerPickerViewController.h"
+
+#import "IntegrationManagerViewController.h"
+
+@interface StickerPickerViewController ()
+
+@end
+
+@implementation StickerPickerViewController
+
+- (void)viewDidLoad
+{
+    [super viewDidLoad];
+
+    self.navigationItem.title = NSLocalizedStringFromTable(@"room_action_send_sticker", @"Vector", nil);
+
+    // Hide back button title
+    self.parentViewController.navigationItem.backBarButtonItem =[[UIBarButtonItem alloc] initWithTitle:@"" style:UIBarButtonItemStylePlain target:nil action:nil];
+
+    UIBarButtonItem *editButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemEdit target:self action:@selector(onEditButtonPressed)];
+    [self.navigationItem setRightBarButtonItem: editButton animated:YES];
+}
+
+- (void)viewWillAppear:(BOOL)animated
+{
+    [super viewWillAppear:animated];
+
+    // Make sure the content is up-to-date when we come back from the sticker picker settings screen
+    [webView reload];
+}
+
+- (void)onEditButtonPressed
+{
+    // Show the sticker picker settings screen
+    IntegrationManagerViewController *modularVC = [[IntegrationManagerViewController alloc]
+                                                   initForMXSession:self.roomDataSource.mxSession
+                                                   inRoom:self.roomDataSource.roomId
+                                                   screen:[IntegrationManagerViewController screenForWidget:kWidgetTypeStickerPicker]
+                                                   widgetId:self.widget.widgetId];
+
+    [self presentViewController:modularVC animated:NO completion:nil];
+}
+
+@end