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

Riot/Modules/Room/Search/Files/RoomFilesSearchViewController.m

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+/*
+ Copyright 2016 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 "RoomFilesSearchViewController.h"
+
+#import "RoomSearchViewController.h"
+
+#import "UIViewController+RiotSearch.h"
+
+#import "FilesSearchCellData.h"
+#import "FilesSearchTableViewCell.h"
+
+#import "AppDelegate.h"
+
+@interface RoomFilesSearchViewController ()
+{
+    // Observe kAppDelegateDidTapStatusBarNotification to handle tap on clock status bar.
+    id kAppDelegateDidTapStatusBarNotificationObserver;
+    
+    // Observe kRiotDesignValuesDidChangeThemeNotification to handle user interface theme change.
+    id kRiotDesignValuesDidChangeThemeNotificationObserver;
+}
+
+@end
+
+@implementation RoomFilesSearchViewController
+
+- (void)finalizeInit
+{
+    [super finalizeInit];
+    
+    // Setup `MXKViewControllerHandling` properties
+    self.enableBarTintColorStatusChange = NO;
+    self.rageShakeManager = [RageShakeManager sharedManager];
+}
+
+- (void)viewDidLoad
+{
+    [super viewDidLoad];
+
+    // Hide line separators of empty cells
+    self.searchTableView.tableFooterView = [[UIView alloc] init];
+
+    // Register cell class used to display the files search result
+    [self.searchTableView registerClass:FilesSearchTableViewCell.class forCellReuseIdentifier:FilesSearchTableViewCell.defaultReuseIdentifier];
+    
+    self.searchTableView.keyboardDismissMode = UIScrollViewKeyboardDismissModeOnDrag;
+    
+    // Observe user interface theme change.
+    kRiotDesignValuesDidChangeThemeNotificationObserver = [[NSNotificationCenter defaultCenter] addObserverForName:kRiotDesignValuesDidChangeThemeNotification object:nil queue:[NSOperationQueue mainQueue] usingBlock:^(NSNotification *notif) {
+        
+        [self userInterfaceThemeDidChange];
+        
+    }];
+    [self userInterfaceThemeDidChange];
+}
+
+- (void)userInterfaceThemeDidChange
+{
+    self.defaultBarTintColor = kRiotSecondaryBgColor;
+    self.barTitleColor = kRiotPrimaryTextColor;
+    self.activityIndicator.backgroundColor = kRiotOverlayColor;
+    
+    // Check the table view style to select its bg color.
+    self.searchTableView.backgroundColor = ((self.searchTableView.style == UITableViewStylePlain) ? kRiotPrimaryBgColor : kRiotSecondaryBgColor);
+    self.view.backgroundColor = self.searchTableView.backgroundColor;
+    
+    self.noResultsLabel.textColor = kRiotPrimaryBgColor;
+    
+    if (self.searchTableView.dataSource)
+    {
+        [self.searchTableView reloadData];
+    }
+}
+
+- (UIStatusBarStyle)preferredStatusBarStyle
+{
+    return kRiotDesignStatusBarStyle;
+}
+
+- (void)destroy
+{
+    [super destroy];
+    
+    if (kRiotDesignValuesDidChangeThemeNotificationObserver)
+    {
+        [[NSNotificationCenter defaultCenter] removeObserver:kRiotDesignValuesDidChangeThemeNotificationObserver];
+        kRiotDesignValuesDidChangeThemeNotificationObserver = nil;
+    }
+}
+
+- (void)viewWillAppear:(BOOL)animated
+{
+    [super viewWillAppear:animated];
+
+    // Screen tracking
+    [[Analytics sharedInstance] trackScreen:@"RoomFilesSearch"];
+    
+    // Observe kAppDelegateDidTapStatusBarNotificationObserver.
+    kAppDelegateDidTapStatusBarNotificationObserver = [[NSNotificationCenter defaultCenter] addObserverForName:kAppDelegateDidTapStatusBarNotification object:nil queue:[NSOperationQueue mainQueue] usingBlock:^(NSNotification *notif) {
+        
+        [self.searchTableView setContentOffset:CGPointMake(-self.searchTableView.mxk_adjustedContentInset.left, -self.searchTableView.mxk_adjustedContentInset.top) animated:YES];
+        
+    }];
+}
+
+- (void)viewWillDisappear:(BOOL)animated
+{
+    [super viewWillDisappear:animated];
+    
+    if (kAppDelegateDidTapStatusBarNotificationObserver)
+    {
+        [[NSNotificationCenter defaultCenter] removeObserver:kAppDelegateDidTapStatusBarNotificationObserver];
+        kAppDelegateDidTapStatusBarNotificationObserver = nil;
+    }
+}
+
+#pragma mark - MXKDataSourceDelegate
+
+- (Class<MXKCellRendering>)cellViewClassForCellData:(MXKCellData*)cellData
+{
+    return FilesSearchTableViewCell.class;
+}
+
+- (NSString *)cellReuseIdentifierForCellData:(MXKCellData*)cellData
+{
+    return FilesSearchTableViewCell.defaultReuseIdentifier;
+}
+
+#pragma mark - Override UITableView delegate
+
+- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath;
+{
+    cell.backgroundColor = kRiotPrimaryBgColor;
+    
+    // Update the selected background view
+    if (kRiotSelectedBgColor)
+    {
+        cell.selectedBackgroundView = [[UIView alloc] init];
+        cell.selectedBackgroundView.backgroundColor = kRiotSelectedBgColor;
+    }
+    else
+    {
+        if (tableView.style == UITableViewStylePlain)
+        {
+            cell.selectedBackgroundView = nil;
+        }
+        else
+        {
+            cell.selectedBackgroundView.backgroundColor = nil;
+        }
+    }
+}
+
+- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
+{
+    // Data in the cells are actually Vector RoomBubbleCellData
+    FilesSearchCellData *cellData = (FilesSearchCellData*)[self.dataSource cellDataAtIndex:indexPath.row];
+    _selectedEvent = cellData.searchResult.result;
+    
+    // Hide the keyboard handled by the search text input which belongs to RoomSearchViewController
+    [((RoomSearchViewController*)self.parentViewController).searchBar resignFirstResponder];
+    
+    [tableView deselectRowAtIndexPath:indexPath animated:YES];
+    
+    // Make the RoomSearchViewController (that contains this VC) open the RoomViewController
+    [self.parentViewController performSegueWithIdentifier:@"showTimeline" sender:self];
+    
+    // Reset the selected event. RoomSearchViewController got it when here
+    _selectedEvent = nil;
+}
+
+@end