Swift-停止avaudioplayer [英] Swift - Stop avaudioplayer

问题描述

我正在尝试将音板构建到应用程序中，并且找到了一种使用标签控制声音播放的有效方法.但是，我现在尝试在AVAudioPlayer上集成一个可以与.stop()方法一起使用的暂停按钮，但是我的当前代码出现错误:

I am trying to build a soundboard into an app and have figured out an efficient way of using tags to control playing the sounds. However I am now trying to integrate a pause button that can be used with the .stop() method on the AVAudioPlayer however I get an error with my current code:

EXC_BAD_ACCESS

这是我目前正在使用的任何想法吗?

This is what I am using at the moment, any ideas?

import UIKit
import AVFoundation

let soundFilenames = ["sound","sound2","sound3"]
var audioPlayers = [AVAudioPlayer]()

class SecondViewController: UIViewController {

     var audioPlayer = AVAudioPlayer()

    override func viewDidLoad() {
        super.viewDidLoad()

     for sound in soundFilenames {
          do {
               let url = NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource(sound, ofType: "mp3")!)
               let audioPlayer = try AVAudioPlayer(contentsOfURL: url)
               audioPlayers.append(audioPlayer)
          } catch {
               //Catch error thrown
               audioPlayers.append(AVAudioPlayer())
          }
     }
     }


     @IBAction func buttonPressed(sender: UIButton) {
          let audioPlayer = audioPlayers[sender.tag]
          audioPlayer.play()
     }
     @IBAction func stop(sender: UIButton) {
          audioPlayer.stop()
     }

}

推荐答案

停止功能中的audioPlayer不是正在播放的播放器.您应该在buttonPressed函数中分配它.

Your audioPlayer in stop function is not the playing player. You should assign it in buttonPressed function.

@IBAction func buttonPressed(sender: UIButton) {
      audioPlayer = audioPlayers[sender.tag]
      audioPlayer.play()
 }

顺便说一句，您可以将audioPlayer标记为?"属性，则在初始化此Controller时会更有效率.

By the way, You can mark audioPlayer as a "?" property, it will be more efficient when init this Controller.

class SecondViewController: UIViewController {

     var audioPlayer: AVAudioPlayer?

     let enableMuiltPlayers = false
....


    @IBAction func buttonPressed(sender: UIButton) {
          if sender.tag < audioPlayers.count else {
               print("out of range")
               return
          }
          if enableMuiltPlayers {
             audioPlayers[sender.tag].play()
          } else {
             audioPlayer?.stop()
             //set the current playing player
             audioPlayer = audioPlayers[sender.tag]
             audioPlayer?.play()
          }
     }

     @IBAction func stop(sender: UIButton) {
          let wantToStopAll = false
          if enableMuiltPlayers  && wantToStopAll {
              stopAll()
          } else {
              audioPlayer?.stop()
          }
          audioPlayer = nil
     }
}

停止所有操作:

fun stopAll() {
    for player in audioPlayers {
        player.stop()
    }
}

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