AVAudioRecorder Record 方法随机返回 NO

标题：AVAudioRecorder的Record方法随机返回NO的原因及解决方法

swift
import AVFoundation
let audioSession = AVAudioSession.sharedInstance()
do {
    try audioSession.setCategory(.playAndRecord, mode: .default)
    try audioSession.setActive(true)
        
    audioSession.requestRecordPermission { (granted) in
        if granted {
            let audioFilename = getDocumentsDirectory().appendingPathComponent("recording.wav")
            let settings = [
                AVFormatIDKey: Int(kAudioFormatLinearPCM),
                AVSampleRateKey: 44100.0,
                AVNumberOfChannelsKey: 2,
                AVEncoderAudioQualityKey: AVAudioQuality.high.rawValue
            ]
                
            do {
                let audioRecorder = try AVAudioRecorder(url: audioFilename, settings: settings)
                audioRecorder.record()
            } catch {
                print("Failed to set up audio recorder: \(error.localizedDescription)")
            }
        } else {
            print("User denied access to microphone")
        }
    }
} catch {
    print("Failed to configure audio session: \(error.localizedDescription)")
}
func getDocumentsDirectory() -> URL {
    let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
    return paths[0]
}