IOS录音,如何在麦克风前检查麦克风/播放是否忙碌

import AVFoundation

let audioSession = AVAudioSession.sharedInstance()

func checkMicrophoneAvailability() -> Bool {
    do {
        try audioSession.setCategory(.playAndRecord, mode: .default, options: .defaultToSpeaker)
        try audioSession.setActive(true)
        return audioSession.isInputAvailable
    } catch {
        return false
    }
}

func checkAudioPlaybackAvailability() -> Bool {
    do {
        try audioSession.setCategory(.playback, mode: .default, options: .defaultToSpeaker)
        try audioSession.setActive(true)
        return audioSession.isOtherAudioPlaying
    } catch {
        return false
    }
}