我正在为消息应用程序使用IntentsExtension和IntentsUIExtension，以允许用户使用Siri发送消息。
这一切都正常工作，消息只发送一次，但是当显示扩展UI时，我在configureView中定义的视图显示了3次。
这是默认的代码意图处理程序。无论是使用这个默认代码还是我的自定义代码，结果都是一样的。UI扩展IntentViewController configureView方法被调用3次：

class IntentHandler: INExtension, INSendMessageIntentHandling, INSearchForMessagesIntentHandling, INSetMessageAttributeIntentHandling {
    
    override func handler(for intent: INIntent) -> Any {
        // This is the default implementation.  If you want different objects to handle different intents,
        // you can override this and return the handler you want for that particular intent.
        
        return self
    }
    
    // MARK: - INSendMessageIntentHandling
    
    // Implement resolution methods to provide additional information about your intent (optional).
    func resolveRecipients(for intent: INSendMessageIntent, with completion: @escaping ([INSendMessageRecipientResolutionResult]) -> Void) {
        if let recipients = intent.recipients {
            
            // If no recipients were provided we'll need to prompt for a value.
            if recipients.count == 0 {
                completion([INSendMessageRecipientResolutionResult.needsValue()])
                return
            }
            
            var resolutionResults = [INSendMessageRecipientResolutionResult]()
            for recipient in recipients {
                let matchingContacts = [recipient] // Implement your contact matching logic here to create an array of matching contacts
                switch matchingContacts.count {
                case 2  ... Int.max:
                    // We need Siri's help to ask user to pick one from the matches.
                    resolutionResults += [INSendMessageRecipientResolutionResult.disambiguation(with: matchingContacts)]
                    
                case 1:
                    // We have exactly one matching contact
                    resolutionResults += [INSendMessageRecipientResolutionResult.success(with: recipient)]
                    
                case 0:
                    // We have no contacts matching the description provided
                    resolutionResults += [INSendMessageRecipientResolutionResult.unsupported()]
                    
                default:
                    break
                    
                }
            }
            completion(resolutionResults)
        } else {
            completion([INSendMessageRecipientResolutionResult.needsValue()])
        }
    }
    
    func resolveContent(for intent: INSendMessageIntent, with completion: @escaping (INStringResolutionResult) -> Void) {
        if let text = intent.content, !text.isEmpty {
            completion(INStringResolutionResult.success(with: text))
        } else {
            completion(INStringResolutionResult.needsValue())
        }
    }
    
    // Once resolution is completed, perform validation on the intent and provide confirmation (optional).
    
    func confirm(intent: INSendMessageIntent, completion: @escaping (INSendMessageIntentResponse) -> Void) {
        // Verify user is authenticated and your app is ready to send a message.
        
        let userActivity = NSUserActivity(activityType: NSStringFromClass(INSendMessageIntent.self))
        let response = INSendMessageIntentResponse(code: .ready, userActivity: userActivity)
        completion(response)
    }
    
    // Handle the completed intent (required).
    
    func handle(intent: INSendMessageIntent, completion: @escaping (INSendMessageIntentResponse) -> Void) {
        // Implement your application logic to send a message here.
        
        let userActivity = NSUserActivity(activityType: NSStringFromClass(INSendMessageIntent.self))
        let response = INSendMessageIntentResponse(code: .success, userActivity: userActivity)
        completion(response)
    }
    
    // Implement handlers for each intent you wish to handle.  As an example for messages, you may wish to also handle searchForMessages and setMessageAttributes.
    
    // MARK: - INSearchForMessagesIntentHandling
    
    func handle(intent: INSearchForMessagesIntent, completion: @escaping (INSearchForMessagesIntentResponse) -> Void) {
        // Implement your application logic to find a message that matches the information in the intent.
        
        let userActivity = NSUserActivity(activityType: NSStringFromClass(INSearchForMessagesIntent.self))
        let response = INSearchForMessagesIntentResponse(code: .success, userActivity: userActivity)
        // Initialize with found message's attributes
        response.messages = [INMessage(
            identifier: "identifier",
            content: "I am so excited about SiriKit!",
            dateSent: Date(),
            sender: INPerson(personHandle: INPersonHandle(value: "sarah@example.com", type: .emailAddress), nameComponents: nil, displayName: "Sarah", image: nil,  contactIdentifier: nil, customIdentifier: nil),
            recipients: [INPerson(personHandle: INPersonHandle(value: "+1-415-555-5555", type: .phoneNumber), nameComponents: nil, displayName: "John", image: nil,  contactIdentifier: nil, customIdentifier: nil)]
            )]
        completion(response)
    }
    
    // MARK: - INSetMessageAttributeIntentHandling
    
    func handle(intent: INSetMessageAttributeIntent, completion: @escaping (INSetMessageAttributeIntentResponse) -> Void) {
        // Implement your application logic to set the message attribute here.
        
        let userActivity = NSUserActivity(activityType: NSStringFromClass(INSetMessageAttributeIntent.self))
        let response = INSetMessageAttributeIntentResponse(code: .success, userActivity: userActivity)
        completion(response)
    }
}

UI代码：

class IntentViewController: UIViewController, INUIHostedViewControlling {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
    }
        
    // MARK: - INUIHostedViewControlling
    
    // Prepare your view controller for the interaction to handle.
    func configureView(for parameters: Set<INParameter>, of interaction: INInteraction, interactiveBehavior: INUIInteractiveBehavior, context: INUIHostedViewContext, completion: @escaping (Bool, Set<INParameter>, CGSize) -> Void) {
        // Do configuration here, including preparing views and calculating a desired size for presentation.
        completion(true, parameters, self.desiredSize)
    }
    
    var desiredSize: CGSize {
        return self.extensionContext!.hostedViewMaximumAllowedSize
    }
    
}

在configureView中的完成处理程序上放置一个断点，我可以看到它被调用了3次。在我的应用程序中，这会导致自定义视图出现3次，一个接一个地垂直堆叠。