向带有蓝牙麦克风的手机扬声器输出音频时出现问题

Question

这是从蓝牙麦克风向扬声器输出音频的代码。 但是我可以从蓝牙耳机听到。 无法听到电话扬声器的声音

AKSettings.useBluetooth = true
AKSettings.defaultToSpeaker = true
AKSettings.enableEchoCancellation = true
    try! AKSettings.setSession(category: .playAndRecord, with: AVAudioSession.CategoryOptions.mixWithOthers)
    mic = AKMicrophone()
    mic.volume = 1.0
    tracker = AKFrequencyTracker(mic)
    silence = AKBooster(tracker, gain: 0)
    micMixer = AKMixer(mic)
    AudioKit.output = micMixer
    do {
        try AudioKit.start()
    } catch {
        AKLog("AudioKit did not start!")
    }