Q:

Unable to compile Siri extension in Swift 2.3

I want to integrate the Siri/Intent extension in my App, currently based on Swift 2.3. I am using the Xcode 8 beta 6 build.
The app fails to even compile, giving out errors as

Type 'IntentHandler' does not conform to protocol 'INSendMessageIntentHandling'
Protocol requires function 'handle(sendMessage:completion:)' with type '(sendMessage: INSendMessageIntent, completion: (INSendMessageIntentResponse) -> Void) -> Void'
Objective-C method 'handleWithSendMessage:completion:' provided by method 'handle(sendMessage:completion:)' does not match the requirement's selector ('handleSendMessage:completion:')

Even the sample app from Apple, UnicornChat fails to compile with the same errors. I did change the SWIFT_VERSION flag to Yes, to support Swift 2.3
Sample Code:
func handle(sendMessage intent: INSendMessageIntent, completion: (INSendMessageIntentResponse) -> Void) {
        let userActivity = NSUserActivity(activityType: NSStringFromClass(INSendMessageIntent.self))
        let response = INSendMessageIntentResponse(code: .Success, userActivity: userActivity)
        completion(response)
    }

This fails with the error above.
Anyone has an idea on how to make Siri work in Swift 2.3?

A:

So, this helped
https://forums.developer.apple.com/message/174455#174455
We need to explicitly define the @objc method signatures with the Swift ones. As in the following works.
@objc (handleSendMessage:completion:)
func handle(sendMessage intent: INSendMessageIntent, completion: (INSendMessageIntentResponse) -> Void) {
 //..
}

