UI播放器 实现播放功能

import UIKit

import AVFoundation            //加入影音架构

class ViewController: UIViewController, AVAudioPlayerDelegate {

    @IBOutlet weak var progress: UIProgressView! //把进度条关联进来

    var audioPlayer: AVAudioPlayer?           //关联播放器

    var timer: NSTimer?                       //关联定时器，进度条有用

    

    

    @IBAction func play(sender: AnyObject) {      //把play按钮关联进来

        let url = NSBundle.mainBundle().URLForResource("小苹果唢呐版", withExtension: "mp3")                  //写上歌曲名称和格式类型

    

      

        

        do {

            //Swift需要明确表明可能出异常语句

            try audioPlayer = AVAudioPlayer(contentsOfURL: url!)

            //            audioPlayer?.enableRate = true

            //            audioPlayer?.rate = 10 //播放速率

            audioPlayer?.prepareToPlay()

            audioPlayer?.play()

            

            print(audioPlayer?.duration)

            

            audioPlayer?.delegate = self

            

            //创建一个 timer 定时器，并且开始运行

            timer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: #selector(didTime(_:)), userInfo: nil, repeats: true)

        }

        catch let error as NSError {

            print(error.code, error.localizedDescription)

        }

        

    }

    @IBAction func stop(sender: AnyObject) {

        timer?.invalidate()

        audioPlayer?.pause()            //关联停止按钮，实现暂停功能

    }

    

    

    func didTime(timer: NSTimer) {

        print("\(audioPlayer?.currentTime)s")

        print("\((audioPlayer?.currentTime)! / (audioPlayer?.duration)!)")

        //计算进度

        progress.progress = Float((audioPlayer?.currentTime)! / (audioPlayer?.duration)!)     //progress为进度条名字，后面是换算方法
        //        progressView.progress

    }

    func audioPlayerDidFinishPlaying(player: AVAudioPlayer, successfully flag:Bool) {

        print("播放完成")
    }
}