需求

生活中比较流行的语音播报有：微信支付到账提醒，电子书阅读听书等等广泛的运用。苹果于iOS7.0推出了Speech框架，支持语音播报功能。因项目中需要在不打开app的情况下，播放一天的工作日程等需求，查过很多资料，遇到很多坑。

文字播报

import UIKit
import AVFoundation
import Speech
import MediaPlayer

class SpeechUtteranceManager: NSObject {
    /// 单例管理语音播报 比较适用于多种类型语音播报管理
    public static let shared = SpeechUtteranceManager()
    
    var synthesizer = AVSpeechSynthesizer()
    var speechUtterance: AVSpeechUtterance?
    var voiceType = AVSpeechSynthesisVoice(language: Locale.current.languageCode)
    private override init() {
        super.init()
        synthesizer.delegate = self
    }
    
    /// 自定义语音播报方法
    /// 此处只举例播报一个String的情况
    func speechWeather(with weather: String) {
        if let _ = speechUtterance {
            synthesizer.stopSpeaking(at: .immediate)
        }
        speechUtterance = AVSpeechUtterance(string: weather)
        
        speechUtterance?.voice = voiceType
        speechUtterance?.rate = 0.5
        synthesizer.speak(speechUtterance!)
         UIApplication.shared.beginReceivingRemoteControlEvents()
         setLockView()
    }

    func stop()  {
        if synthesizer.isSpeaking {
          synthesizer.pauseSpeaking(at: .word)
        }
    }
    func Speaking()  {
        if synthesizer.isPaused {
            synthesizer.continueSpeaking()
        }
    }
//后台控制：显示标题、控制语速 可以添加显示图片等设置
    func setLockView(){
       let mpic =  MPNowPlayingInfoCenter.default()
            mpic.nowPlayingInfo = [
            MPMediaItemPropertyTitle:"语音播报",
            MPNowPlayingInfoPropertyPlaybackRate:1.0
        ]
    }
 
    func stopSpeaking() {
        if let _ = speechUtterance {
            synthesizer.stopSpeaking(at: .immediate)
        }
    }
}
extension SpeechUtteranceManager: AVSpeechSynthesizerDelegate {

    //开始播放
    func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, didStart utterance: AVSpeechUtterance) {
        
    }
    //播放完成
    func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, didFinish utterance: AVSpeechUtterance) {
        do {
            try AVAudioSession.sharedInstance().setActive(false, with: .notifyOthersOnDeactivation)
        } catch {
            print(error.localizedDescription)
        }
        speechUtterance = nil
    }
    //播放中止
    func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, didPause utterance: AVSpeechUtterance) {
    }
    //恢复播放
    func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, didContinue utterance: AVSpeechUtterance) {
        
    }
    //取消播放
    func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, didCancel utterance: AVSpeechUtterance) {
        
    }
}

播放方法：
SpeechUtteranceManager.shared.speechWeather(with:"播放文本")
文本不可以太长，可以连续添加。

后台播放

需要添加权限：Targets->Capabilities->background modes下Audiu,AirPlay打勾

后台控制

在UIViewController 界面中

//监听为第一响应者 这句话很重要，研究了好久，没有这句代码，锁屏检测不到
override var canBecomeFirstResponder: Bool{
        return true
    }
//后台控制按钮 没有补全 自行补全一下
    override func remoteControlReceived(with event: UIEvent?) {
        guard let event = event else {
            print("no event\n")
            return
        }
        
        if event.type == UIEventType.remoteControl {
            switch event.subtype {
            case .remoteControlTogglePlayPause:
                print("暂停/播放")
            case .remoteControlPreviousTrack:
                print("上一首")
            case .remoteControlNextTrack:
                print("下一首")
            case .remoteControlPlay:
                print("播放")
                SpeechUtteranceManager.shared.Speaking()
            case .remoteControlPause:
                print("暂停")
              SpeechUtteranceManager.shared.stop()
              
            default:
                break
            }
            
        }
    }

延伸：根据排队添加文本，后台播放、后台控制，可以自己做一个小说阅读听书功能。