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

Riot/Modules/Room/Files/RoomFilesViewController.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 "RoomFilesViewController.h"
+
+#import "FilesSearchTableViewCell.h"
+
+#import "AppDelegate.h"
+
+#import "AttachmentsViewController.h"
+
+@interface RoomFilesViewController ()
+{
+    /**
+     Observe kRiotDesignValuesDidChangeThemeNotification to handle user interface theme change.
+     */
+    id kRiotDesignValuesDidChangeThemeNotificationObserver;
+}
+
+@end
+
+@implementation RoomFilesViewController
+
+#pragma mark -
+
+- (instancetype)initWithNibName:(nullable NSString *)nibNameOrNil bundle:(nullable NSBundle *)nibBundleOrNil
+{
+    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
+    if (self)
+    {
+        self.autoJoinInvitedRoom = NO;
+    }
+    
+    return self;
+}
+
+- (nullable instancetype)initWithCoder:(NSCoder *)aDecoder
+{
+    self = [super initWithCoder:aDecoder];
+    if (self)
+    {
+        self.autoJoinInvitedRoom = NO;
+    }
+    
+    return self;
+}
+
+#pragma mark -
+
+- (void)finalizeInit
+{
+    [super finalizeInit];
+    
+    // Setup `MXKViewControllerHandling` properties
+    self.enableBarTintColorStatusChange = NO;
+    self.rageShakeManager = [RageShakeManager sharedManager];
+}
+
+- (void)viewDidLoad
+{
+    [super viewDidLoad];
+    
+    // Do not show toolbar
+    [self setRoomInputToolbarViewClass:nil];
+    
+    // set the default extra
+    [self setRoomActivitiesViewClass:nil];
+    
+    // Custom the attachmnet viewer
+    [self setAttachmentsViewerClass:AttachmentsViewController.class];
+    
+    // Register first customized cell view classes used to render bubbles
+    [self.bubblesTableView registerClass:FilesSearchTableViewCell.class forCellReuseIdentifier:FilesSearchTableViewCell.defaultReuseIdentifier];
+    
+    self.bubblesTableView.separatorStyle = UITableViewCellSeparatorStyleSingleLine;
+    
+    // Hide line separators of empty cells
+    self.bubblesTableView.tableFooterView = [[UIView alloc] init];
+    
+    [self setNavBarButtons];
+    
+    // Update the inputToolBar height (This will trigger a layout refresh)
+    [UIView setAnimationsEnabled:NO];
+    [self roomInputToolbarView:self.inputToolbarView heightDidChanged:0 completion:nil];
+    [UIView setAnimationsEnabled:YES];
+    
+    // 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.bubblesTableView.backgroundColor = ((self.bubblesTableView.style == UITableViewStylePlain) ? kRiotPrimaryBgColor : kRiotSecondaryBgColor);
+    self.view.backgroundColor = self.bubblesTableView.backgroundColor;
+    
+    if (self.bubblesTableView.dataSource)
+    {
+        [self.bubblesTableView reloadData];
+    }
+}
+
+- (UIStatusBarStyle)preferredStatusBarStyle
+{
+    return kRiotDesignStatusBarStyle;
+}
+
+- (void)destroy
+{
+    [super destroy];
+    
+    if (kRiotDesignValuesDidChangeThemeNotificationObserver)
+    {
+        [[NSNotificationCenter defaultCenter] removeObserver:kRiotDesignValuesDidChangeThemeNotificationObserver];
+        kRiotDesignValuesDidChangeThemeNotificationObserver = nil;
+    }
+}
+
+// This method is called when the viewcontroller is added or removed from a container view controller.
+- (void)didMoveToParentViewController:(nullable UIViewController *)parent
+{
+    [super didMoveToParentViewController:parent];
+    
+    [self setNavBarButtons];
+}
+
+- (void)setNavBarButtons
+{
+    // Check whether the view controller is currently displayed inside a segmented view controller or not.
+    UIViewController* topViewController = ((self.parentViewController) ? self.parentViewController : self);
+    topViewController.navigationItem.rightBarButtonItem = nil;
+    topViewController.navigationItem.leftBarButtonItem = nil;
+}
+
+#pragma mark - MXKDataSourceDelegate
+
+- (Class<MXKCellRendering>)cellViewClassForCellData:(MXKCellData*)cellData
+{
+    Class cellViewClass = nil;
+    
+    // Sanity check
+    if ([cellData conformsToProtocol:@protocol(MXKRoomBubbleCellDataStoring)])
+    {
+        id<MXKRoomBubbleCellDataStoring> bubbleData = (id<MXKRoomBubbleCellDataStoring>)cellData;
+        
+        // Select the suitable table view cell class
+        if (bubbleData.attachment)
+        {
+            cellViewClass = FilesSearchTableViewCell.class;
+        }
+    }
+    
+    return cellViewClass;
+}
+
+- (NSString *)cellReuseIdentifierForCellData:(MXKCellData*)cellData
+{
+    Class class = [self cellViewClassForCellData:cellData];
+    
+    if ([class respondsToSelector:@selector(defaultReuseIdentifier)])
+    {
+        return [class defaultReuseIdentifier];
+    }
+    
+    return nil;
+}
+
+#pragma mark - 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
+{
+    if (tableView == self.bubblesTableView)
+    {
+        UITableViewCell *cell = [self.bubblesTableView cellForRowAtIndexPath:indexPath];
+        [self showAttachmentInCell:cell];
+        
+        [tableView deselectRowAtIndexPath:indexPath animated:YES];
+    }
+}
+
+@end