iOS:如何检查扬声器是否打开

import AVFoundation

let audioSession = AVAudioSession.sharedInstance()

do {
    try audioSession.setCategory(.playback)
} catch {
    print("设置音频会话类别失败：\(error)")
}

do {
    try audioSession.setActive(true)
} catch {
    print("激活音频会话失败：\(error)")
}

let currentRoute = audioSession.currentRoute
let outputs = currentRoute.outputs

var isSpeakerEnabled = false

for output in outputs {
    if output.portType == .builtInSpeaker {
        isSpeakerEnabled = true
        break
    }
}

if isSpeakerEnabled {
    print("扬声器已打开")
} else {
    print("扬声器未打开")
}