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

Riot/Modules/Main/RiotSplitViewController.m

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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 "RiotSplitViewController.h"
+
+@implementation RiotSplitViewController
+
+- (UIStatusBarStyle)preferredStatusBarStyle
+{
+    if (self.collapsed)
+    {
+        // Look for the view controller displayed at the top.
+        UIViewController *topViewController = self.viewControllers.firstObject;
+        
+        while ([topViewController isKindOfClass:[UINavigationController class]])
+        {
+            topViewController = ((UINavigationController*)topViewController).topViewController;
+        }
+        
+        if (topViewController)
+        {
+            return [topViewController preferredStatusBarStyle];
+        }
+    }
+    
+    // Keep the default UISplitViewController style.
+    return [super preferredStatusBarStyle];
+}
+
+- (BOOL)prefersStatusBarHidden
+{
+    if (self.collapsed)
+    {
+        // Look for the view controller displayed at the top.
+        UIViewController *topViewController = self.viewControllers.firstObject;
+        
+        while ([topViewController isKindOfClass:[UINavigationController class]])
+        {
+            topViewController = ((UINavigationController*)topViewController).topViewController;
+        }
+        
+        if (topViewController)
+        {
+            return [topViewController prefersStatusBarHidden];
+        }
+    }
+    
+    // Keep the default UISplitViewController mode.
+    return [super prefersStatusBarHidden];
+}
+
+@end