iMessage App

An iMessage App is a type of application within Apple's Messages app that allows users to interact with various services or perform tasks directly within their iMessage conversations, while an iMessage Extension is a feature that developers can use to extend the capabilities of their existing iOS apps to integrate with the Messages app, enabling users to access specific functionalities of the app within the iMessage interface.

override func didBecomeActive(with conversation: MSConversation)
    super.didBecomeActive(with: conversation)
    if let message = conversation.selectedMessage {
        updateUiForSelectedMessage(message)
    } else {
        updateUiForManualOpening()
    }
}