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

Riot/Modules/Integrations/Widgets/Jitsi/JitsiViewController.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 "JitsiViewController.h"
+
+static const NSString *kJitsiServerUrl = @"https://jitsi.riot.im/";
+
+@interface JitsiViewController ()
+{
+    NSString *jitsiUrl;
+
+    BOOL video;
+}
+
+@end
+
+@implementation JitsiViewController
+
+#pragma mark - Class methods
+
++ (UINib *)nib
+{
+    return [UINib nibWithNibName:NSStringFromClass(self.class)
+                          bundle:[NSBundle bundleForClass:self.class]];
+}
+
++ (instancetype)jitsiViewController
+{
+    JitsiViewController *jitsiViewController = [[[self class] alloc] initWithNibName:NSStringFromClass(self.class)
+                                          bundle:[NSBundle bundleForClass:self.class]];
+    return jitsiViewController;
+}
+
+- (void)openWidget:(Widget*)widget withVideo:(BOOL)aVideo
+           success:(void (^)())success
+           failure:(void (^)(NSError *error))failure
+{
+    video = aVideo;
+    _widget = widget;
+
+    [_widget widgetUrl:^(NSString * _Nonnull widgetUrl) {
+
+        // Extract the jitsi conference id from the widget url
+        NSString *confId;
+        NSURL *url = [NSURL URLWithString:widgetUrl];
+        if (url)
+        {
+            NSURLComponents *components = [[NSURLComponents new] initWithURL:url resolvingAgainstBaseURL:NO];
+            NSArray *queryItems = [components queryItems];
+
+            for (NSURLQueryItem *item in queryItems)
+            {
+                if ([item.name isEqualToString:@"confId"])
+                {
+                    confId = item.value;
+                    break;
+                }
+            }
+
+            // And build from it the url to use in jitsi-meet sdk
+            if (confId)
+            {
+                jitsiUrl = [NSString stringWithFormat:@"%@%@", kJitsiServerUrl, confId];
+            }
+        }
+
+        if (jitsiUrl)
+        {
+            if (success)
+            {
+                success();
+            }
+        }
+        else
+        {
+            NSLog(@"[JitsiVC] Failed to load widget: %@. Widget event: %@", widget, widget.widgetEvent);
+
+            if (failure)
+            {
+                failure(nil);
+            }
+        }
+
+    } failure:^(NSError * _Nonnull error) {
+
+        NSLog(@"[JitsiVC] Failed to load widget 2: %@. Widget event: %@", widget, widget.widgetEvent);
+
+        if (failure)
+        {
+            failure(nil);
+        }
+    }];
+}
+
+- (void)hangup
+{
+    jitsiUrl = nil;
+
+    // It would have been nicer to ask JitsiMeetView but there is no api.
+    // Dismissing the view controller and releasing it does the job for the moment
+    if (_delegate)
+    {
+        [_delegate jitsiViewController:self dismissViewJitsiController:nil];
+    }
+}
+
+- (void)viewDidLoad
+{
+    [super viewDidLoad];
+
+    self.jitsiMeetView.delegate = self;
+
+    // Pass the URL to jitsi-meet sdk
+    [self.jitsiMeetView loadURLObject: @{
+                                         @"url": jitsiUrl,
+                                         @"configOverwrite": @{
+                                                 @"startWithVideoMuted": @(!video)
+                                                 }
+                                         }];
+
+    // TODO: Set up user info but it is not yet available in the jitsi-meet iOS SDK
+    // See https://github.com/jitsi/jitsi-meet/issues/1880
+}
+
+- (void)didReceiveMemoryWarning
+{
+    [super didReceiveMemoryWarning];
+}
+
+#pragma mark - Actions
+
+- (IBAction)onBackToAppButtonPressed:(id)sender
+{
+    if (_delegate)
+    {
+        [_delegate jitsiViewController:self goBackToApp:nil];
+    }
+}
+
+#pragma mark - JitsiMeetViewDelegate
+
+- (void)conferenceFailed:(NSDictionary *)data
+{
+    NSLog(@"[JitsiViewController] conferenceFailed - data: %@", data);
+}
+
+- (void)conferenceLeft:(NSDictionary *)data
+{
+    dispatch_async(dispatch_get_main_queue(), ^{
+        
+        // The conference is over. Let the delegate close this view controller.
+        if (_delegate)
+        {
+            [_delegate jitsiViewController:self dismissViewJitsiController:nil];
+        }
+        else
+        {
+            // Do it ourself
+            [self dismissViewControllerAnimated:YES completion:nil];
+        }
+    });
+}
+
+@end