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Method to capture voice input when using CPVoiceControlTemplate
In my navigation CarPlay app I am needing to capture voice input and process that into text. Is there a built in way to do this in CarPlay? I did not find one, so I used the following, but I am running into issues where the AVAudioSession will throw an error when I am trying to set active to false after I have captured the audio. public func startRecording(completionHandler: @escaping (_ completion: String?) -> ()) throws { // Cancel the previous task if it's running. if let recognitionTask = self.recognitionTask { recognitionTask.cancel() self.recognitionTask = nil } // Configure the audio session for the app. let audioSession = AVAudioSession.sharedInstance() try audioSession.setCategory(.record, mode: .default, options: [.duckOthers, .interruptSpokenAudioAndMixWithOthers]) try audioSession.setActive(true, options: .notifyOthersOnDeactivation) let inputNode = self.audioEngine.inputNode // Create and configure the speech recognition request. self.recognitionRequest = SFSpeechAudioBufferRecognitionRequest() guard let recognitionRequest = self.recognitionRequest else { fatalError("Unable to created a SFSpeechAudioBufferRecognitionRequest object") } recognitionRequest.shouldReportPartialResults = true // Keep speech recognition data on device recognitionRequest.requiresOnDeviceRecognition = true // Create a recognition task for the speech recognition session. // Keep a reference to the task so that it can be canceled. self.recognitionTask = self.speechRecognizer.recognitionTask(with: recognitionRequest) { result, error in var isFinal = false if let result = result { // Update the text view with the results. let textResult = result.bestTranscription.formattedString isFinal = result.isFinal let confidence = result.bestTranscription.segments[0].confidence if confidence > 0.0 { isFinal = true completionHandler(textResult) } } if error != nil || isFinal { // Stop recognizing speech if there is a problem. self.audioEngine.stop() do { try audioSession.setActive(false, options: .notifyOthersOnDeactivation) } catch { print(error) } inputNode.removeTap(onBus: 0) self.recognitionRequest = nil self.recognitionTask = nil if error != nil { completionHandler(nil) } } } // Configure the microphone input. let recordingFormat = inputNode.outputFormat(forBus: 0) inputNode.installTap(onBus: 0, bufferSize: 1024, format: recordingFormat) { (buffer: AVAudioPCMBuffer, when: AVAudioTime) in self.recognitionRequest?.append(buffer) } self.audioEngine.prepare() try self.audioEngine.start() } Again, is there a build-in method to capture audio in CarPlay? If not, why would the AVAudioSession throw this error? Error Domain=NSOSStatusErrorDomain Code=560030580 "Session deactivation failed" UserInfo={NSLocalizedDescription=Session deactivation failed}
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171
Jul ’25
CPNavigationAlert image size very small with long title variant
I am using CPNavigationAlert and am getting a specific name for the title, so I do not have more than one variant. Sometimes, the variant title is longer, which for some reason makes the image very small. I have tried to make sure to keep displayScale in mind: let maximumImageSize = CPListItem.maximumImageSize let displayScale = self.interfaceController?.carTraitCollection.displayScale ?? 2 let imageSize = CGSizeMake(maximumImageSize.width * displayScale, maximumImageSize.width * displayScale) let image = CarPlayMapUtility().getIconAlertImage(item: item, frame: imageSize) If the titleVariants is shorter, the image is displayed corrected. If it is longer, the image might be extremely small or not shown at all. Is this expected?
Topic: UI Frameworks SubTopic: UIKit Tags:
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96
Aug ’25
iOS26 UINavigationController swipe from middle on maps causing issue
I have a UINavigation controller which on the second viewController has a Google Map view. In iOS 18 you would navigate normally around the map, and swipe your finger from the left side of the screen to move the map, this worked correctly. However, in iOS 26 swiping from left to right from anywhere but the far right side of the screen will cause the UI to try to pop the viewController. This does not happen when I add Apple Maps or other map frameworks to the VC. Is there a way to disable the "swipe from middle" in iOS 26?
Topic: UI Frameworks SubTopic: UIKit Tags:
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137
Oct ’25
CarPlay: AVSpeechUtterance not speaking/playing audio in some cars
I am having an issue with the code that I posted below. I capture voice in my CarPlay app, then allow the user to have it read back to them using AVSpeechUtterance. This works fine on some cars, but many of my beta testers report no audio being played. I have also experienced this in a rental car where the audio was either too quiet or the audio didn't play. Does anyone see any issue with the code that I posted? This is for CarPlay specifically. class CarPlayTextToSpeechService: NSObject, ObservableObject, AVSpeechSynthesizerDelegate { private var speechSynthesizer = AVSpeechSynthesizer() static let shared = CarPlayTextToSpeechService() /// Completion callback private var completionCallback: (() -> Void)? override init() { super.init() speechSynthesizer.delegate = self } func configureAudioSession() { do { try AVAudioSession.sharedInstance().setCategory(.playback, mode: .voicePrompt, options: [.duckOthers, .interruptSpokenAudioAndMixWithOthers, .allowBluetoothHFP]) } catch { print("Failed to set audio session category: \(error.localizedDescription)") } } public func speak(_ text: String, completion: (() -> Void)? = nil) { self.configureAudioSession() // Store the completion callback self.completionCallback = completion Task(priority: .high) { let speechUtterance = AVSpeechUtterance(string: text) let langCode = Locale.preferredLocalLanguageCountryCode if langCode == "en-US" { speechUtterance.voice = AVSpeechSynthesisVoice(identifier: AVSpeechSynthesisVoiceIdentifierAlex) } else { speechUtterance.voice = AVSpeechSynthesisVoice(language: langCode) } try AVAudioSession.sharedInstance().setActive(true, options: .notifyOthersOnDeactivation) speechSynthesizer.speak(speechUtterance) } } func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, didFinish utterance: AVSpeechUtterance) { Task { stopSpeech() try AVAudioSession.sharedInstance().setActive(false) } // Call completion callback if available self.completionCallback?() self.completionCallback = nil } func stopSpeech() { speechSynthesizer.stopSpeaking(at: .immediate) } }
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183
Dec ’25