Xcode配置

• 如果需要后臺(tái)播報(bào)語(yǔ)音，需要到Target->Capabilities選中Background Modes 的 Audio...選項(xiàng)。

若不勾選此項(xiàng)，程序在后臺(tái)運(yùn)行的時(shí)候調(diào)用語(yǔ)音播報(bào)會(huì)報(bào)出codeCannotStartPlaying錯(cuò)誤。

管理類(lèi)文件

import AVFoundation

class SpeechUtteranceManager: NSObject {
    
    /// 單例管理語(yǔ)音播報(bào) 比較適用于多種類(lèi)型語(yǔ)音播報(bào)管理
    public static let shared = SpeechUtteranceManager()
    
    var synthesizer = AVSpeechSynthesizer()
    var speechUtterance: AVSpeechUtterance?
    var voiceType = AVSpeechSynthesisVoice(language: Locale.current.languageCode)
    
    private override init() {
        super.init()
        do {
            try AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback, with: .duckOthers)
        } catch {
            print(error.localizedDescription)
        }
        synthesizer.delegate = self
    }
    
    /// 自定義語(yǔ)音播報(bào)方法 
    /// 此處只舉例播報(bào)一個(gè)String的情況
    func speechWeather(with weather: String) {
        if let _ = speechUtterance {
            synthesizer.stopSpeaking(at: .immediate)
        }
        
        do {
            try AVAudioSession.sharedInstance().setActive(true)
        } catch {
            print(error.localizedDescription)
        }
        
        speechUtterance = AVSpeechUtterance(string: weather)
        
        speechUtterance?.voice = voiceType
        speechUtterance?.rate = 0.5
        synthesizer.speak(speechUtterance!)
    }
}

extension SpeechUtteranceManager: AVSpeechSynthesizerDelegate {
    func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, didFinish utterance: AVSpeechUtterance) {
        do {
            try AVAudioSession.sharedInstance().setActive(false, with: .notifyOthersOnDeactivation)
        } catch {
            print(error.localizedDescription)
        }
        speechUtterance = nil
    }
}

使用

/// 例如播報(bào)天氣
/// 若要兼容語(yǔ)言國(guó)際化
/// NSLocalizedString 搭配 Locale.current.languageCode 食用效果更佳
SpeechUtteranceManager.shared.speechWeather(with: NSLocalizedString("The Rainy Day", comment: ""))

關(guān)鍵代碼

setCategory

do {
    try AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback, with: .duckOthers)
} catch {
    print(error.localizedDescription)
}

• AVAudioSessionCategoryPlayback：后臺(tái)播報(bào)
• .duckOthers：混合通道,語(yǔ)音播報(bào)時(shí)其他軟件聲音變?。ㄒ魳?lè)）

若不設(shè)置混合通道，在后臺(tái)播報(bào)時(shí)會(huì)報(bào)codeCannotInterruptOthers錯(cuò)誤

setActive

將 AVAudioSession 置為活動(dòng)狀態(tài)

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

記得在結(jié)束調(diào)用時(shí)將活動(dòng)狀態(tài)置為false

do {
    try AVAudioSession.sharedInstance().setActive(false)
} catch {
    print(error.localizedDescription)
}

語(yǔ)音播報(bào)簡(jiǎn)單使用
語(yǔ)音播報(bào)詳細(xì)屬性