Working with App Groups and Extensions

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>com.apple.security.application-groups</key>
    <array>
        <string>group.com.yourcompany.appgroup</string>
    </array>
</dict>
</plist>

let userDefaults = UserDefaults(suiteName: "group.com.example.appgroup")
userDefaults?.set("sharedValue", forKey: "key")
let value = userDefaults?.string(forKey: "key")

import UIKit
import Social

class ShareViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        // Configure the UI for sharing
    }
    
    @IBAction func shareButtonTapped(_ sender: UIButton) {
        // Handle sharing logic here
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>NSExtensionPointIdentifier</key>
    <string>com.apple.widget-extension</string>
    <key>NSExtensionPointName</key>
    <string>Today Extension</string>
</dict>
</plist>

import WidgetKit
import SwiftUI

struct Provider: TimelineProvider {
    func placeholder(in context: Context) -> SimpleEntry {
        SimpleEntry(date: Date(), configuration: ConfigurationIntent())
    }

    func getSnapshot(in context: Context, completion: @escaping (SimpleEntry) -> ()) {
        let entry = SimpleEntry(date: Date(), configuration: ConfigurationIntent())
        completion(entry)
    }

    func getTimeline(in context: Context, completion: @escaping (Timeline<SimpleEntry>) -> ()) {
        let entries: [SimpleEntry] = [
            SimpleEntry(date: Date(), configuration: ConfigurationIntent())
        ]
        let timeline = Timeline(entries: entries, policy: .after(Date().addingTimeInterval(60 * 60)))
        completion(timeline)
    }
}

struct SimpleEntry: TimelineEntry {
    let date: Date
    let configuration: ConfigurationIntent
}

import SwiftUI
import WidgetKit

struct SimpleWidgetEntryView : View {
    var entry: Provider.Entry

    var body: some View {
        VStack(alignment: .leading) {
            Text("Hello, World!")
                .font(.headline)
            Text(entry.date, style: .time)
        }
        .padding()
    }
}

struct SimpleWidgetEntryView_Previews: PreviewProvider {
    static var previews: some View {
        SimpleWidgetEntryView(entry: SimpleEntry(date: Date(), configuration: ConfigurationIntent()))
    }
}

import UIKit

class CustomKeyboardViewController: UIInputViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        setupKeyboard()
    }

    private func setupKeyboard() {
        let button = UIButton(type: .system)
        button.setTitle("Hello", for: .normal)
        button.addTarget(self, action: #selector(handleButtonTap), for: .touchUpInside)
        view.addSubview(button)
    }

    @objc private func handleButtonTap() {
        textDocumentProxy.insertText("Hello")
    }
}

import UIKit

class ExtensionViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        // Configure UI for action extension
    }
    
    @IBAction func performAction(_ sender: Any) {
        // Handle the action here
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>NSExtensionPointIdentifier</key>
    <string>com.apple.ui-services</string>
    <key>NSExtension</key>
    <dict>
        <key>NSExtensionPointIdentifier</key>
        <string>com.apple.ui-services</string>
        <key>NSExtensionPointIdentifier</key>
        <string>com.apple.ui-services</string>
    </dict>
</dict>
</plist>

import FileProvider

class ExampleFileProvider: NSFileProviderExtension {
    override func providePlaceholder(at url: URL, completionHandler: @escaping (Error?) -> Void) {
        // Create a placeholder file at the specified URL
        let placeholder = url.appendingPathExtension("placeholder")
        try? "Placeholder content".write(to: placeholder, atomically: true, encoding: .utf8)
        completionHandler(nil)
    }

    override func itemChanged(at url: URL) {
        // Handle changes to items in the file system
        print("Item changed at: \(url)")
    }
}

let suiteName = "group.com.example.shared"
let userDefaults = UserDefaults(suiteName: suiteName)
let value = userDefaults?.string(forKey: "sharedKey")

let groupIdentifier = "group.com.example.shared"
guard let containerURL = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: groupIdentifier) else { return }
let fileURL = containerURL.appendingPathComponent("sharedData.json")
let data = "shared content".data(using: .utf8)
try? data?.write(to: fileURL)

import Security

let keychainQuery: [String: Any] = [
    kSecClass as String: kSecClassGenericPassword,
    kSecAttrAccount as String: "userAccount",
    kSecAttrService as String: "com.example.app",
    kSecAttrAccessGroup as String: "com.example.sharedKeychain"
]

let status = SecItemAdd(keychainQuery as CFDictionary, nil)
if status == errSecSuccess {
    print("Keychain item added successfully")
} else {
    print("Failed to add keychain item: \(status)")
}

import UIKit

class ExtensionDelegate: NSObject {
    func applicationDidFinishLaunching(_ application: UIApplication) {
        // Handle app launch for extension
    }
    
    func applicationWillResignActive(_ application: UIApplication) {
        // Handle app resigning active for extension
    }
    
    func applicationDidEnterBackground(_ application: UIApplication) {
        // Handle app entering background for extension
    }
    
    func applicationWillEnterForeground(_ application: UIApplication) {
        // Handle app entering foreground for extension
    }
    
    func applicationWillTerminate(_ application: UIApplication) {
        // Handle app termination for extension
    }
}