pip install ably

from ably import AblyRealtime

client = AblyRealtime('your-api-key')

channel = client.channels.get('my-channel')

def listener(message):
    print('Received:', message.data)

channel.subscribe('event', listener)

dependencies: [
    .package(url: "https://github.com/ably/ably-cocoa", from: "1.2.0")
]

import Ably

let client = ARTRealtime(key: "your-api-key")

let channel = client.channels.get("my-channel")

channel.subscribe("event") { message in
    print("Received: \\(message.data)")
}