iOS音频与视频的开发（一）

                import UIKit
import AVKit

                class
                 NADiscoverViewController : UIViewController {
    
    lazy var audioPlayer = AVAudioPlayer.init()
    var durationTime:Float = 0.0//播放时长
    var timer : Timer?
    
    lazy var startBtn : UIButton = {
        let startBtn = UIButton()
        startBtn.setImage(UIImage.init(named: "bofang"), for: .normal)
        startBtn.addTarget(self, action: #selector(playAction(sender:)), for: .touchUpInside)
        return startBtn
    }()
    
    lazy var finishBtn : UIButton = {
        let finishBtn = UIButton()
        finishBtn.setImage(UIImage.init(named: "jieshu"), for: .normal)
        finishBtn.addTarget(self , action: #selector(endAction(sender:)), for:.touchUpInside)
        return finishBtn
    }()
    
    lazy var progress : UIProgressView = {
        let progress = UIProgressView()
        return progress
    }()
    
    lazy var messageLabel : UILabel = {
        let messageLabel = UILabel()
        messageLabel.text = "时长"
        messageLabel.numberOfLines = 0return messageLabel
    }()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        self.navigationItem.title = "发现"
        
        setSubViewConstraints()
        let fileURL : URL = Bundle.main.url(forResource: "a", withExtension: "mp3")!
        
        do {
            let player : AVAudioPlayer = try AVAudioPlayer.init(contentsOf: fileURL)
            audioPlayer = player
        }catch{}
        let str = String.init(format: "音频文件的声道数：%d\n音频文件的持续时间：%g", audioPlayer.numberOfChannels,audioPlayer.duration)
        messageLabel.text = str
        durationTime = Float(audioPlayer.duration)
        //将循环次数设为-1,用于指定该音频文件循环播放
        audioPlayer.numberOfLoops = -1
        audioPlayer.delegate = self
    }
    
    @objc func playAction(sender:UIButton) -> Void {
        if audioPlayer.isPlaying {
            audioPlayer.pause()
            startBtn.setImage(UIImage.init(named: "bofang"), for: .normal)
        } else {
            audioPlayer.play()
            startBtn.setImage(UIImage.init(named: "zanting"), for: .normal)
        }
        if timer == nil {
            timer = Timer.scheduledTimer(timeInterval: 0.1, target: self, selector: #selector(updateProge), userInfo: nil, repeats: true)
        }
    }
    @objc func endAction(sender:UIButton) -> Void {
        audioPlayer.stop()
        timer?.isValid
        timer = nil
    }
    
    @objc func updateProge() {
        progress.progress = Float(audioPlayer.currentTime) / durationTime
    }
    func setSubViewConstraints() -> Void {
        view.addSubview(startBtn)
        startBtn.snp.makeConstraints { (make) in
            make.top.equalTo(100)
            make.left.equalTo(50)
            make.width.height.equalTo(50)
        }
        
        view.addSubview(finishBtn)
        finishBtn.snp.makeConstraints { (make) in
            make.top.equalTo(startBtn)
            make.right.equalTo(-50)
            make.width.height.equalTo(50)
        }
        
        view.addSubview(progress)
        progress.snp.makeConstraints { (make) in
            make.top.equalTo(startBtn.snp_bottom).offset(30)
            make.left.equalTo(50)
            make.right.equalTo(-50)
        }
        view.addSubview(messageLabel)
        messageLabel.snp.makeConstraints { (make) in
            make.top.equalTo(progress.snp_bottom).offset(30)
            make.left.equalTo(50)
            make.right.equalTo(-50)
        }
    }
}

extension NADiscoverViewController : AVAudioPlayerDelegate {
    //当audioplayer播放完成后将会自动播放    func audioPlayerDidFinishPlaying(_ player: AVAudioPlayer, successfully flag: Bool) {
        if player == audioPlayer && flag {
            print("播放完成")
            
        }
    }
    
    func audioPlayerBeginInterruption(_ player: AVAudioPlayer) {
        if player == audioPlayer {
            print("被中断了")
        }
    }
}

                import UIKit
import AVKit

                class
                 NAPublishViewController : UIViewController {
    var moviePlayer = AVPlayerViewController.init()
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let movieUrl : URL = Bundle.main.url(forResource: "movie", withExtension: "mp4")!
        //使用指定的url创建MPMoviesPlayerController
        moviePlayer.player = AVPlayer.init(url: movieUrl)
        //是否显示回放控制
        moviePlayer.showsPlaybackControls = true//开启这个播放的时候支持(全屏)横竖屏if #available(iOS 11.0, *) {
            moviePlayer.entersFullScreenWhenPlaybackBegins = true
        }
        //开启这个播放结束的是否，可以退出全屏if #available(iOS 11.0, *) {
            moviePlayer.exitsFullScreenWhenPlaybackEnds = true
        }
        view.addSubview(moviePlayer.view)
        //判断moviePlayer已经准备好视频第一播放帧if moviePlayer.isReadyForDisplay {
            moviePlayer.player?.play()
        }
        
    }
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.    }
}