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

Riot/Modules/RoomKeyRequest/RoomKeyRequestViewController.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>
+
+/**
+ The `RoomKeyRequestViewController` display a modal dialog at the top of the
+ application asking the user if he wants to share room keys with a user's device.
+ For the moment, the user is himself.
+ */
+@interface RoomKeyRequestViewController : NSObject <MXKEncryptionInfoViewDelegate>
+
+/**
+ The UIAlertController instance which handles the dialog.
+ */
+@property (nonatomic, readonly) UIAlertController *alertController;
+
+@property (nonatomic, readonly) MXSession *mxSession;
+@property (nonatomic, readonly) MXDeviceInfo *device;
+
+/**
+ Initialise an `RoomKeyRequestViewController` instance.
+
+ @param deviceInfo the device to share keys to.
+ @param wasNewDevice flag indicating whether this is the first time we meet the device.
+ @param session the related matrix session.
+ @param onComplete a block called when the the dialog is closed.
+ @return the newly created instance.
+ */
+- (instancetype)initWithDeviceInfo:(MXDeviceInfo*)deviceInfo wasNewDevice:(BOOL)wasNewDevice andMatrixSession:(MXSession*)session onComplete:(void (^)())onComplete;
+
+/**
+ Show the dialog in a modal way.
+ */
+- (void)show;
+
+/**
+ Hide the dialog.
+ */
+- (void)hide;
+
+@end