Question

当我按下一个应该停止音频的按钮时，它只会停止整个应用程序并崩溃。随时给我一些帮助来解决这个问题。代码的这一部分是该按钮连接到的地方，

@IBAction func stop(_ sender: UIButton) {
if audioPlayer1.isPlaying {      //error is here on this line.
        audioPlayer1.stop()
    } else {
        self.audioPlayer1.play()
}

这是代码

//
//  ViewController.swift
//  app21
//
//  Created by Jared Evan Miller on 8/14/17.
//  Copyright © 2017 Jared Evan Miller. All rights reserved.
//

import UIKit
import AVFoundation

class ViewController: UIViewController {

let soundFilenames = ["5","8","7","4","6","1","3","2"]
var audioPlayers = [AVAudioPlayer]()
var lastAudioPlayer = 0
var audioPlayer = AVAudioPlayer()
var audioPlayer1 = AVAudioPlayer()
override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

// set up audio players
   for sound in soundFilenames{
        do {
            // Try to do somerhing
            let url = URL(fileURLWithPath: Bundle.main.path(forResource: sound, ofType: "wav")!);
            let audioPlayer = try AVAudioPlayer(contentsOf:url)

            audioPlayers.append(audioPlayer)
        }
        catch {

            // Catch the error that is thrown
            audioPlayers.append(AVAudioPlayer())


        }
               }

}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

@IBAction func buttonTapped(_ sender: UIButton) {
    // Get the audioPlayer that corresponds to the button that they tapped

    let lastPlayer = audioPlayers[lastAudioPlayer]
    lastPlayer.stop();
    lastAudioPlayer = sender.tag;
    lastPlayer.currentTime = 0;
    let audioPlayer = audioPlayers[sender.tag]
    audioPlayer.currentTime = 0;
    audioPlayer.play()

}

@IBAction func buttonTapped2(_ sender: UIButton) {

    let lastPlayer = audioPlayers[lastAudioPlayer]
    lastPlayer.stop();
    lastAudioPlayer = sender.tag;
    lastPlayer.currentTime = 0;
    let audioPlayer = audioPlayers[sender.tag]
    audioPlayer.currentTime = 0;
    audioPlayer.play()

}
@IBAction func stop(_ sender: UIButton) {
      if audioPlayer1.isPlaying {      //error is here on this line.
        audioPlayer1.stop()
    } else {
        self.audioPlayer1.play()
}
}
}

我该如何解决这个问题？谢谢你的帮助!!!!!

Answer 1

请检查以下行：

let audioPlayer = audioPlayers[sender.tag]

应该如下。因为你已经初始化了audioPlayer。

audioPlayer = audioPlayers[sender.tag]

找到以下代码：

@IBAction func buttonTapped(_ sender: UIButton) {
    // Get the audioPlayer that corresponds to the button that they tapped
    let lastPlayer = audioPlayers[lastAudioPlayer]
    lastPlayer.stop();
    lastAudioPlayer = sender.tag;
    lastPlayer.currentTime = 0;
    audioPlayer = audioPlayers[sender.tag]
    audioPlayer.currentTime = 0;
    audioPlayer.play()
}

@IBAction func buttonTapped2(_ sender: UIButton) {
    let lastPlayer = audioPlayers[lastAudioPlayer]
    lastPlayer.stop();
    lastAudioPlayer = sender.tag;
    lastPlayer.currentTime = 0;
    audioPlayer = audioPlayers[sender.tag]
    audioPlayer.currentTime = 0;
    audioPlayer.play()
}

@IBAction func stop(_ sender: UIButton) {
    if audioPlayer.isPlaying { //Here you are trying on audioPlayer1 and you are not initialized this anywhere
        audioPlayer.stop()
    } else {
        self.audioPlayer.play()
    }
}

线程1：错误访问0 x 48

1 个答案: