# ios

***

**1. Image Processing:**

```cpp
// Load image
UIImage *image = [UIImage imageNamed:@"image.jpg"];

// Convert to CIImage
CIImage *ciImage = [CIImage imageWithCGImage:image.CGImage];

// Apply filter
CIFilter *filter = [CIFilter filterWithName:@"CIRemoveNoise"];
[filter setValue:ciImage forKey:kCIInputImageKey];
CIImage *filteredImage = [filter outputImage];

// Convert back to UIImage
UIImage *processedImage = [UIImage imageWithCIImage:filteredImage];
```

**2. Networking:**

```cpp
// Create a URL request
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"https://example.com"]];

// Create a session configuration
NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];

// Create a session
NSURLSession *session = [NSURLSession sessionWithConfiguration:configuration];

// Create a data task
NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
    // Handle the response
}];

// Start the task
[dataTask resume];
```

**3. Location Tracking:**

```cpp
// Create a location manager
CLLocationManager *locationManager = [[CLLocationManager alloc] init];

// Request authorization
[locationManager requestWhenInUseAuthorization];

// Start updating location
[locationManager startUpdatingLocation];

// Handle location updates
[locationManager setDelegate:self];
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray<CLLocation *> *)locations {
    // Do something with the location
}
```

**4. Database:**

```cpp
// Create a database context
NSManagedObjectContext *context = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSMainQueueConcurrencyType];

// Create an entity
NSEntityDescription *entity = [NSEntityDescription entityForName:@"Task" inManagedObjectContext:context];

// Create a new managed object
NSManagedObject *newTask = [[NSManagedObject alloc] initWithEntity:entity insertIntoManagedObjectContext:context];

// Set the properties
[newTask setValue:@"New Task" forKey:@"name"];

// Save the changes
NSError *error = nil;
if (![context save:&error]) {
    // Handle the error
}
```

**5. UI Design:**

```cpp
// Create a view controller
UIViewController *viewController = [[UIViewController alloc] init];

// Set the title
viewController.title = @"My View Controller";

// Create a label
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(20, 20, 200, 20)];
label.text = @"Hello World";
[viewController.view addSubview:label];

// Add the view controller to the navigation controller
UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:viewController];

// Present the navigation controller
[self presentViewController:navigationController animated:YES completion:nil];
```

**6. Animation:**

```cpp
// Create a UIView
UIView *view = [[UIView alloc] initWithFrame:CGRectMake(20, 20, 200, 200)];
view.backgroundColor = [UIColor redColor];
[self.view addSubview:view];

// Create an animation block
[UIView animateWithDuration:1.0 animations:^{
    view.frame = CGRectMake(20, 200, 200, 200);
    view.backgroundColor = [UIColor blueColor];
}];
```

**7. Gesture Recognition:**

```cpp
// Create a gesture recognizer
UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTapGesture:)];

// Add the gesture recognizer to the view
[self.view addGestureRecognizer:tapGestureRecognizer];

// Handle the gesture
- (void)handleTapGesture:(UITapGestureRecognizer *)gestureRecognizer {
    // Do something when the view is tapped
}
```

**8. Sharing:**

```cpp
// Create an activity view controller
UIActivityViewController *activityViewController = [[UIActivityViewController alloc] initWithActivityItems:@[@"Hello World"] applicationActivities:nil];

// Present the activity view controller
[self presentViewController:activityViewController animated:YES completion:nil];
```

**9. Bluetooth:**

```cpp
// Create a central manager
CBCentralManager *centralManager = [[CBCentralManager alloc] initWithDelegate:self queue:nil];

// Scan for peripherals
[centralManager scanForPeripheralsWithServices:nil options:nil];

// Handle peripheral discovery
- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary<NSString *, id> *)advertisementData RSSI:(NSNumber *)RSSI {
    // Do something with the peripheral
}
```

**10. Augmented Reality:**

```cpp
// Create a session configuration
ARWorldTrackingConfiguration *configuration = [[ARWorldTrackingConfiguration alloc] init];

// Create a session
ARSession *session = [[ARSession alloc] init];

// Set the configuration
session.configuration = configuration;

// Create a scene view
ARSCNView *sceneView = [[ARSCNView alloc] initWithFrame:self.view.bounds];

// Set the session
sceneView.session = session;

// Add the scene view to the view
[self.view addSubview:sceneView];

// Start the session
[session startRunning];
```

**11. Core Data:**

```cpp
// Create a managed object context
NSManagedObjectContext *context = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSMainQueueConcurrencyType];

// Create a new managed object
NSManagedObject *newObject = [NSEntityDescription insertNewObjectForEntityForName:@"Person" inManagedObjectContext:context];

// Set the properties
[newObject setValue:@"John Doe" forKey:@"name"];

// Save the changes
NSError *error = nil;
if (![context save:&error]) {
    // Handle the error
}
```

**12. JSON:**

```cpp
// Create a JSON string
NSString *jsonString = @"{\"name\":\"John Doe\",\"age\":30}";

// Convert to NSData
NSData *data = [jsonString dataUsingEncoding:NSUTF8StringEncoding];

// Parse the JSON
NSError *error = nil;
NSDictionary *jsonDictionary = [NSJSONSerialization JSONObjectWithData:data options:0 error:&error];

// Handle the JSON dictionary
if (jsonDictionary) {
    // Do something with the dictionary
}
```

**13. Web View:**

```cpp
// Create a web view
WKWebView *webView = [[WKWebView alloc] initWithFrame:self.view.bounds];

// Load a URL
[webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"https://example.com"]]];
```

**14. Table View:**

```cpp
// Create a table view
UITableView *tableView = [[UITableView alloc] initWithFrame:self.view.bounds];

// Set the data source and delegate
tableView.dataSource = self;
tableView.delegate = self;

// Register a cell class
[tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"Cell"];

// Add the table view to the view
[self.view addSubview:tableView];
```

**15. Collection View:**

```cpp
// Create a collection view
UICollectionView *collectionView = [[UICollectionView alloc] initWithFrame:self.view.bounds];

// Set the data source and delegate
collectionView.dataSource = self;
collectionView.delegate = self;

// Register a cell class
[collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"Cell"];

// Add the collection view to the view
[self.view addSubview:collectionView];
```

**16. Map View:**

```cpp
// Create a map view
MKMapView *mapView = [[MKMapView alloc] initWithFrame:self.view.bounds];

// Set the region
MKCoordinateRegion region = MKCoordinateRegionMake(CLLocationCoordinate2DMake(37.33233141, -122.03121860), MKCoordinateSpanMake(0.02, 0.02));
[mapView setRegion:region animated:YES];

// Add the map view to the view
[self.view addSubview:mapView];
```

**17. PDF:**

```cpp
// Create a PDF document
PDFDocument *document = [[PDFDocument alloc] init];

// Create a new page
PDFPage *page = [[PDFPage alloc] initWithPageSize:CGSizeMake(612, 792)];

// Add the page to the document
[document addPage:page];

// Get the graphics context
CGContextRef context = page.graphicsContext;

// Draw text
[„Hello World“ drawInRect:CGRectMake(100, 100, 200, 200) withFont:[UIFont systemFontOfSize:20]];

// Save the document
[document writeToURL:[NSURL fileURLWithPath:@"/tmp/test.pdf"] options:0 error:nil];
```

**18. Speech Recognition:**

```cpp
// Create a speech recognizer
SFSpeechRecognizer *speechRecognizer = [[SFSpeechRecognizer alloc] init];

// Request authorization
[speechRecognizer requestAuthorization:^(SFSpeechRecognizerAuthorizationStatus status) {
    // Handle the authorization status
}];

// Create a recognition request
SFSpeechAudioBufferRecognitionRequest *recognitionRequest = [[SFSpeechAudioBufferRecognitionRequest alloc] init];

// Start the recognition
SFSpeechAudioBufferRecognitionTask *recognitionTask = [speechRecognizer recognitionTaskWithRequest:recognitionRequest resultHandler:^(SFSpeechRecognitionResult *result, NSError *error) {
    // Handle the result
}];

// Feed audio data to the recognizer
AVAudioRecorder *audioRecorder = [[AVAudioRecorder alloc] init];
[audioRecorder record];
[recognitionTask appendAudioSampleBuffer:audioRecorder.audioBuffer];
```

**19. Text to Speech:**

```cpp
// Create a speech synthesizer
AVSpeechSynthesizer *speechSynthesizer = [[AVSpeechSynthesizer alloc] init];

// Create a speech utterance
AVSpeechUtterance *speechUtterance = [[AVSpeechUtterance alloc] initWithString:@"Hello World"];
speechUtterance.voice = [AVSpeechSynthesisVoice voiceWithLanguage:@"en-US"];

// Speak the utterance
[speechSynthesizer speakUtterance:speechUtterance];
```

**20. Camera:**

```cpp
// Create a capture session
AVCaptureSession *session = [[AVCaptureSession alloc] init];

// Add input and output devices
AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
AVCaptureInput *input = [[AVCaptureDeviceInput alloc] initWithDevice:device error:nil];
AVCaptureOutput *output = [[AVCaptureStillImageOutput alloc] init];

// Add the input and output to the session
[session addInput:input];
[session addOutput:output];

// Start the session
[session startRunning];

// Capture an image
AVCaptureConnection *connection = [output connectionWithMediaType:AVMediaTypeVideo];
[output captureStillImageAsynchronouslyFromConnection:connection completionHandler:^(CMSampleBufferRef imageDataSampleBuffer, NSError *error) {
    // Handle the image data
}];
```

**21. Notifications:**

```cpp
// Create a notification center
NSNotificationCenter *notificationCenter = [NSNotificationCenter defaultCenter];

// Add an observer
[notificationCenter addObserver:self selector:@selector(handleNotification:) name:@"MyNotification" object:nil];

// Post a notification
[notificationCenter postNotificationName:@"MyNotification" object:nil];

// Handle the notification
- (void)handleNotification:(NSNotification *)notification {
    // Do something when the notification is received
}
```

**22. Location Services:**

```cpp
// Create a location manager
CLLocationManager *locationManager = [[CLLocationManager alloc] init];

// Request authorization
[locationManager requestWhenInUseAuthorization];

// Start updating location
[locationManager startUpdatingLocation];

// Handle location updates
[locationManager setDelegate:self];
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray<CLLocation *> *)locations {
    // Do something with the location
}
```

**23. Motion Sensing:**

```cpp
// Create a motion manager
CMMotionManager *motionManager = [[CMMotionManager alloc] init];

// Start updating accelerometer data
[motionManager startAccelerometerUpdatesToQueue:[NSOperationQueue mainQueue] withHandler:^(CMAccelerometerData *data, NSError *error) {
    // Handle the accelerometer data
}];

// Stop updating accelerometer data
[motionManager stopAccelerometerUpdates];
```

**24. iCloud:**

```cpp
// Create a document
NSDocument *document = [[NSDocument alloc] init];

// Save the document to iCloud
[document saveToURL:[NSURL URLWithString:@"iCloud://com.example.myapp/Documents/MyDocument.txt"] ofType:@"txt" completionHandler:^(BOOL success, NSError *error) {
    // Handle the save operation
}];

// Load the document from iCloud
[document loadFromURL:[NSURL URLWithString:@"iCloud://com.example.myapp/Documents/MyDocument.txt"] ofType:@"txt" completionHandler:^(BOOL success, NSError *error) {
    // Handle the load operation
}];
```

**25. Siri Shortcuts:**

```cpp
// Define a shortcut
INShortcut *shortcut = [[INShortcut alloc] initWithIntent:[INIntent intentWithIdentifier:@"com.example.myapp.MyShortcut"]];

// Add an action
INIntent *action = [[INSendEmailIntent alloc] initWithTitle:@"My Shortcut"];
[shortcut.intent setParameterValue:action forParameter:"myAction"];

// Save the shortcut
[[INVoiceShortcutCenter sharedInstance] setVoiceShortcuts:@[shortcut]];
```

**26. Apple Pay:**

```cpp
// Create a payment request
PKPaymentRequest *request = [[PKPaymentRequest alloc] init];

// Set the merchant identifier
request.merchantIdentifier = @"com.example.myapp";

// Set the supported payment networks
request.supportedNetworks = @[PKPaymentNetworkVisa, PKPaymentNetworkMasterCard];

// Add a payment item
PKPaymentItem *item = [[PKPaymentItem alloc] init];
item.amount = [NSDecimalNumber decimalNumberWithString:@"10.00"];
item.label = @"My Product";
[request.paymentItems addObject:item];

// Create a payment authorization controller
PKPaymentAuthorizationViewController *controller = [[PKPaymentAuthorizationViewController alloc] initWithPaymentRequest:request];

// Present the controller
[self presentViewController:controller animated:YES completion:nil];
```

**27. HealthKit:**

```cpp
// Create a health store
HKHealthStore *healthStore = [[HKHealthStore alloc] init];

// Request authorization
[healthStore requestAuthorizationToShareTypes:nil readTypes:[NSSet setWithObject:HKObjectTypeQuantityTypeIdentifierStepCount] completion:^(BOOL success, NSError *error) {
    // Handle the authorization status
}];

// Read step count data
HKSampleQuery *query = [[HKSampleQuery alloc] initWithSampleType:[HKObjectType quantityTypeForIdentifier:HKQuantityTypeIdentifierStepCount] predicate:nil limit:100 sortDescriptors:nil resultsHandler:^(HKSampleQuery *query, NSArray<__kindof HKSample *> *results, NSError *error) {
    // Handle the results
}];
[healthStore executeQuery:query];
```

**28. HomeKit:**

```cpp
// Create a home manager
HMHomeManager *homeManager = [[HMHomeManager alloc] init];

// Add an observer for home updates
[homeManager addObserver:self selector:@selector(handleHomeUpdate:) name:HMHomeManagerDidUpdateHomesNotification object:nil];

// Handle home updates
- (void)handleHomeUpdate:(NSNotification *)notification {
    // Do something when the home is updated
}
```

**29. Game Center:**

```cpp
// Create a game center view controller
GKGameCenterViewController *gameCenterViewController = [[GKGameCenterViewController alloc] init];

// Set the view controller delegate
gameCenterViewController.gameCenterDelegate = self;

// Present the game center view controller
[self presentViewController:gameCenterViewController animated:YES completion:nil];

// Handle game center events
- (void)gameCenterViewControllerDidFinish:(GKGameCenterViewController *)gameCenterViewController {
    // Do something when the game center view controller is dismissed
}
```

**30. Multipeer Connectivity:**

```cpp
// Create a peer identifier
MCPeerID *peerID = [[MCPeerID alloc] initWithDisplayName:@"My Device"];

// Create a session
MCSession *session = [[MCSession alloc] initWithPeer:peerID securityIdentity:nil encryptionPreference:MCEncryptionNone];

// Set the session delegate
session.delegate = self;

// Start advertising the session
[session startAdvertisingPeer];

// Handle session events
- (void)session:(MCSession *)session didReceiveConnectionRequestFromPeer:(MCPeerID *)peerID withContext:(NSData *)context {
    // Do something when a connection request is received
}

- (void)session:(MCSession *)session didFinishReceivingResourceWithName:(NSString *)resourceName fromPeer:(MCPeerID *)peerID atURL:(NSURL *)localURL withError:(NSError *)error {
    // Do something when a resource is received
}
```

**31. SceneKit:**

```cpp
// Create a scene view
SCNView *sceneView = [[SCNView alloc] initWithFrame:self.view.bounds];

// Create a scene
SCNScene *scene = [[SCNScene alloc] init];

// Create a camera
SCNCamera *camera = [SCNCamera camera];
camera.position = SCNVector3Make(0, 0, 10);

// Create a node for the camera
SCNNode *cameraNode = [[SCNNode alloc] init];
cameraNode.camera = camera;

// Add the camera node to the scene
[scene.rootNode addChildNode:cameraNode];

// Create a geometry object
SCNBox *box = [SCNBox boxWithWidth:1 height:1 length:1];

// Create a node for the geometry object
SCNNode *boxNode = [[SCNNode alloc] init];
boxNode.geometry = box;

// Add the geometry node to the scene
[scene.rootNode addChildNode:boxNode];

// Set the scene to the scene view
sceneView.scene = scene;

// Add the scene view to the view
[self.view addSubview:sceneView];
```

**32. Metal:**

```cpp
// Create a device
MTLDevice *device = MTLCreateSystemDefaultDevice();

// Create a command queue
MTLCommandQueue *commandQueue = [device newCommandQueue];

// Create a render pipeline descriptor
MTLRenderPipelineDescriptor *pipelineDescriptor = [[MTLRenderPipelineDescriptor alloc] init];

// Set the vertex function
pipelineDescriptor.vertexFunction = [device newFunctionWithName:@"vertex_main"];

// Set the fragment function
pipelineDescriptor.fragmentFunction = [device newFunctionWithName:@"fragment_main"];

// Create a render pipeline state
MTLRenderPipelineState *pipelineState = [device newRenderPipelineStateWithDescriptor:pipelineDescriptor error:nil];

// Create a command buffer
MTLCommandBuffer *commandBuffer = [commandQueue commandBuffer];

// Create a render pass descriptor
MTLRenderPassDescriptor *renderPassDescriptor = [[MTLRenderPassDescriptor alloc] init];

// Set the color attachment
renderPassDescriptor.colorAttachments[0].texture = [device newTextureWithDescriptor:[[MTLTextureDescriptor alloc] init] offset:0];

// Create a render command encoder
MTLRenderCommandEncoder *renderCommandEncoder = [commandBuffer renderCommandEncoderWithDescriptor:renderPassDescriptor];

// Set the render pipeline state
[renderCommandEncoder setRenderPipelineState:pipelineState];

// Draw a triangle
[renderCommandEncoder drawPrimitives:MTLPrimitiveTypeTriangle vertexCount:3];

// End the render command encoder
[renderCommandEncoder endEncoding];

// Commit the command buffer
[commandBuffer commit];
```

**33. Core Image:**

```cpp
// Create a CIImage
CIImage *image = [CIImage imageWithCGImage:[UIImage imageNamed:@"image.jpg"].CGImage];

// Create a CIFilter
CIFilter *filter = [CIFilter filterWithName:@"CIColorInvert"];

// Set the filter parameters
[filter setValue:image forKey:kCIInputImageKey];

// Get the output image
CIImage *outputImage = [filter valueForKey:kCIOutputImageKey];

// Convert the output image to a UIImage
UIImage *processedImage = [UIImage imageWithCIImage:outputImage];
```

**34. CloudKit:**

```cpp
// Create a public database
CKDatabase *database = [[CKContainer defaultContainer] publicCloudDatabase];

// Create a record
CKRecord *record = [[CKRecord alloc] initWithRecordType:@"MyRecordType"];
[record setObject:@"John Doe" forKey:@"name"];

// Save the record to the database
[database saveRecord:record completionHandler:^(CKRecord *record, NSError *error) {
    // Handle the save operation
}];

// Query the database
CKQuery *query = [[CKQuery alloc] initWithRecordType:@"MyRecordType" predicate:[NSPredicate predicateWithFormat:@"name = 'John Doe'"]];
[database performQuery:query completionHandler:^(NSArray<CKRecord *> *results, NSError *error) {
    // Handle the query results
}];
```

**35. CoreData:**

```cpp
// Create a managed object context
NSManagedObjectContext *context = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSMainQueueConcurrencyType];

// Create a new managed object
NSManagedObject *newObject = [NSEntityDescription insertNewObjectForEntityForName:@"Person" inManagedObjectContext:context];

// Set the properties
[newObject setValue:@"John Doe" forKey:@"name"];

// Save the changes
NSError *error = nil;
if (![context save:&error]) {
    // Handle the error
}
```

**36. Realm:**

```cpp
// Create a Realm configuration
RLMRealmConfiguration *configuration = [RLMRealmConfiguration defaultConfiguration];

// Open a Realm
RLMRealm *realm = [RLMRealm realmWithConfiguration:configuration error:nil];

// Create a new object
RLMObject *newObject = [RLMObject objectWithClassName:@"Person"];
[newObject setValue:@"John Doe" forKey:@"name"];

// Add the object to the Realm
[realm addObject:newObject];
```

**37. Google Analytics:**

```cpp
// Create a tracker
id<GAITracker> tracker = [[GAI sharedInstance] trackerWithTrackingID:@"UA-XXXXX-Y"];

// Send a screen view event
[tracker send:[[GAIDictionaryBuilder createScreenView] build]];
```

**38. Facebook SDK:**

```cpp
// Initialize the SDK
FBSDKCoreKit.initialize()

// Log in with Facebook
FBSDKLoginManager().logIn(withReadPermissions: ["public_profile"], from: self) { (result, error) in
    // Handle the login result
}
```

**39. Twitter SDK:**

```cpp
// Initialize the SDK
TWTRTwitter.sharedInstance().start(withConsumerKey: "YOUR_CONSUMER_KEY", consumerSecret: "YOUR_CONSUMER_SECRET")

// Log in with Twitter
TWTRTwitter.sharedInstance().logIn(withCompletion: { (session, error) in
    // Handle the login result
})
```

**40. Google Maps:**

```cpp
// Create a map view
GMSCameraPosition *camera = [GMSCameraPosition cameraWithLatitude:37.33233141 longitude:-122.03121860 zoom:15];
GMSMapView *mapView = [GMSMapView mapWithFrame:self.view.bounds camera:camera];

// Add the map view to the view
[self.view addSubview:mapView];
```

**41. Firebase:**

```cpp
// Initialize Firebase
FirebaseApp.configure()

// Create a Firestore database
let db = Firestore.firestore()

// Add a document to the database
db.collection("users").document("John Doe").setData(["name": "John Doe"])
```

**42. AVFoundation:**

```cpp
// Create a capture session
AVCaptureSession *session = AVCaptureSession.init()

// Add an input device
let captureDevice = AVCaptureDevice.default(for: .video)!
let input = try! AVCaptureDeviceInput(device: captureDevice)
session.addInput(input)

// Add an output device
let output = AVCapturePhotoOutput()
session.addOutput(output)

// Start the session
session.startRunning()

// Capture a still image
output.capturePhoto(with: AVCapturePhotoSettings(), delegate: self)

func captureOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error: Error?) {
    // Handle the captured image
}
```

**43. iMessage:**

```cpp
// Create a conversation
let conversation = MSConversationHelper.sharedInstance().createConversation(with: ["John Doe"])

// Send a message
conversation.sendMessage("Hello World") { (error) in
    // Handle the send operation
}
```

**44. Apple Pencil:**

```cpp
// Handle pencil touches
func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    guard let touch = touches.first else { return }

    if touch.type == .pencil {
        // Handle the pencil touch
    }
}
```

**45. PassKit:**

```cpp
// Create a pass library
PKPassLibrary *passLibrary = PKPassLibrary()

// Add a pass to the library
passLibrary.addPass(PKPass(data: Data())) { (error) in
    // Handle the add operation
}
```

**46. Core Haptics:**

```cpp
// Create a haptic generator
let hapticGenerator = CHHapticGenerator(type: .notification)

// Create a haptic event
let hapticEvent = CHHapticEvent(eventType: .notification, parameters: nil)

// Play the haptic event
hapticGenerator.start()
hapticGenerator.playEvent(hapticEvent)
```

**47. UIKIt:**

```cpp
// Create a UILabel
let label = UILabel(frame: CGRect(x: 20, y: 20, width: 200, height: 20))
label.text = "Hello World"

// Add the label to the view
self.view.addSubview(label)
```

**48. SwiftUI:**

```cpp
import SwiftUI

// Create a SwiftUI view
struct ContentView: View {
    var body: some View {
        Text("Hello World")
    }
}

// Create a SceneDelegate
class SceneDelegate: UIResponder, UIWindowSceneDelegate {
    var window: UIWindow?

    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
        // Create a UIWindowScene
        let windowScene = UIWindowScene(session: session, connectionOptions: connectionOptions)
        window = UIWindow(windowScene: windowScene)

        // Create a SwiftUI view controller
        let viewController = UIHostingController(rootView: ContentView())
        window?.rootViewController = viewController

        // Make the window visible
        window?.makeKeyAndVisible()
    }
}
```

**49. Combine:**

```cpp
import Combine

// Create a publisher
let publisher = Publishers.Timer(timeInterval: 1, scheduler: DispatchQueue.main, tolerance: nil).autoconnect()

// Create a subscriber
let subscriber = publisher.sink(receiveValue: { (value) in
    // Handle the value
})
```

**50. ARKit:**

```cpp
import ARKit

// Create an ARSCNView
let sceneView = ARSCNView(frame: UIScreen.main.bounds)

// Add the scene view to the view
self.view.addSubview(sceneView)

// Create a session configuration
let configuration = ARWorldTrackingConfiguration()

// Start the session
sceneView.session.run(configuration)
```