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

Riot/Modules/Common/SegmentedViewController/SegmentedViewController.h

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+/*
+ Copyright 2015 OpenMarket Ltd
+ 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 <MatrixSDK/MatrixSDK.h>
+
+#import "UIViewController+RiotSearch.h"
+
+/**
+ This view controller manages several uiviewcontrollers like UISegmentedController manages uiTableView
+ except that the managed items are custom UIViewControllers.
+ It uses a Vector design.
+ */
+@interface SegmentedViewController : MXKViewController
+
+#pragma mark - Class methods
+@property (weak, nonatomic) IBOutlet UIView *selectionContainer;
+@property (weak, nonatomic) IBOutlet NSLayoutConstraint *selectionContainerTopConstraint;
+@property (weak, nonatomic) IBOutlet NSLayoutConstraint *selectionContainerHeightConstraint;
+@property (weak, nonatomic) IBOutlet UIView *viewControllerContainer;
+
+/**
+ The index of the view controller that currently has the focus.
+ */
+@property (nonatomic) NSUInteger selectedIndex;
+
+/**
+ The tint color for the section header (kRiotColorGreen by default).
+ */
+@property (nonatomic) UIColor *sectionHeaderTintColor;
+
+/**
+ The view controller that currently has the focus.
+ */
+@property (nonatomic, readonly) UIViewController *selectedViewController;
+
+/**
+ The view controllers managed by this SegmentedViewController instance.
+ */
+@property (nonatomic, readonly) NSArray<UIViewController*> *viewControllers;
+
+/**
+ Returns the `UINib` object initialized for a `SegmentedViewController`.
+
+ @return The initialized `UINib` object or `nil` if there were errors during initialization
+ or the nib file could not be located.
+ 
+ @discussion You may override this method to provide a customized nib. If you do,
+ you should also override `SegmentedViewController` to return your
+ view controller loaded from your custom nib.
+ */
++ (UINib *)nib;
+
+/**
+ Creates and returns a new `SegmentedViewController` object.
+
+ @discussion This is the designated initializer for programmatic instantiation.
+ @return An initialized `SegmentedViewController` object if successful, `nil` otherwise.
+ */
++ (instancetype)segmentedViewController;
+
+/**
+ init the segmentedViewController with a list of UIViewControllers.
+ The subviewcontrollers must implement didMoveToParentViewController to display the navbar button.
+ 
+ @discussion: the segmentedViewController gets the ownership of the provided arrays and their content.
+ 
+ @param titles the section tiles
+ @param viewControllers the list of viewControllers to display.
+ @param defaultSelected index of the default selected UIViewController in the list.
+ */
+- (void)initWithTitles:(NSArray*)titles viewControllers:(NSArray*)viewControllers defaultSelected:(NSUInteger)defaultSelected;
+
+/**
+ Callback used to take into account the change of the user interface theme.
+ */
+- (void)userInterfaceThemeDidChange;
+
+@end