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

Riot/Modules/Rooms/DirectoryPicker/DirectoryServerPickerViewController.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 <MatrixKit/MatrixKit.h>
+
+@interface DirectoryServerPickerViewController : MXKTableViewController <MXKDataSourceDelegate, UITableViewDelegate>
+
+/**
+ Display data managed by the passed `MXKDirectoryServersDataSource`.
+
+ @param dataSource the data source serving the data.
+ @param onComplete a block called when the picker disappears. It provides data about
+                   the selected protocol instance or homeserver.
+                   Both nil means the user cancelled the picker.
+ */
+- (void)displayWithDataSource:(MXKDirectoryServersDataSource*)dataSource
+                   onComplete:(void (^)(id<MXKDirectoryServerCellDataStoring> cellData))onComplete;
+
+@end
+