ios - 应用无法找到音频蓝牙 HFP 免提端口 Swift

Question

在我的应用程序中，我想检查已经连接到手机的 AVAudio 端口类型。下面的代码适用于 BluetoothA2DP 和耳机，但当我将手机连接到汽车免提装置时不适用于 BluetoothHFP。谁能帮我？!我认为已经阅读了关于免提/AV/蓝牙以及许多其他内容的所有 SO 帖子，但无法弄清楚为什么它无法识别 BluetoothHFP 输出端口类型。

import AVFoundation

func startCheckAVConnection() {

    // set the AVAudioSession to allow bluetooth. This do/try/catch doesn't seem to make a difference if it is here or not.
    do{
        try AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayAndRecord, with: AVAudioSessionCategoryOptions.allowBluetooth)
    } catch{
        print(error)
    }

    // Check possible outputs for handsfree
    let outputs = AVAudioSession.sharedInstance().currentRoute.outputs

    if outputs.count != 0 {
        for output in outputs {
            if output.portType == AVAudioSessionPortBluetoothA2DP {
                peripheralLabel.text = "connected to BluetoothA2DP"
            } else if output.portType == AVAudioSessionPortBluetoothHFP { // NOT RECOGNISED
                peripheralLabel.text = "connected to BluetoothHFP"
            } else if output.portType == AVAudioSessionPortHeadphones {
                peripheralLabel.text = "connected to Headphones"
            }
        }
    } else {
        peripheralLabel.text = "Please connect handsfree"
    }

    // Add observer for audioRouteChangeListener
    NotificationCenter.default.addObserver(
        self,
        selector: #selector(TopVC.audioRouteChangeListener(_:)),
        name: NSNotification.Name.AVAudioSessionRouteChange,
        object: nil)
}

Answer 1

我需要在 setCategory 之后添加 setActive。

 do { try AVAudioSession.sharedInstance().setActive(true)
        print("setActive")
    } catch {
        print(error)
    }