sdk-for-swift/docs/examples/messaging/delete-topic.md

import Appwrite

let client = Client()
    .setEndpoint("https://<REGION>.cloud.appwrite.io/v1") // Your API Endpoint
    .setProject("<YOUR_PROJECT_ID>") // Your project ID
    .setKey("<YOUR_API_KEY>") // Your secret API key

let messaging = Messaging(client)

let result = try await messaging.deleteTopic(
    topicId: "<TOPIC_ID>"
)