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

Riot/Modules/Integrations/WidgetPicker/WidgetPickerViewController.h

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+/*
+ Copyright 2017 Vector Creations 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 <UIKit/UIKit.h>
+
+#import <MatrixSDK/MatrixSDK.h>
+#import <MatrixKit/MatrixKit.h>
+
+/**
+ `WidgetPickerViewController` displays the list of widgets within a room plus a
+ way to open the integration manager for this room.
+
+ TODO: The feature is still in dev. WidgetPickerViewController` is not yet a pure
+ UIViewController.
+ As there is no specified design, the list is displayed in a simple UIAlertController.
+ It would be nice if this picker could directly:
+     - Remove a widget
+     - Launch the integration manager to edit a widget
+     - Automatically updates on widgets change
+ */
+@interface WidgetPickerViewController : NSObject
+
+/**
+ The UIAlertController instance which handles the dialog.
+ */
+@property (nonatomic, readonly) UIAlertController *alertController;
+
+/**
+ Create the `WidgetPickerViewController` instance.
+
+ @param mxSession the session to use.
+ @param roomId the room where to list available widgets.
+ */
+- (instancetype)initForMXSession:(MXSession*)mxSession inRoom:(NSString*)roomId;
+
+/**
+ Show the dialog in a given view controller.
+
+ @param mxkViewController the mxkViewController where to show the dialog.
+ */
+- (void)showInViewController:(MXKViewController*)mxkViewController;
+
+@end