线程1：EXC_BAD_ACCESS（代码= 1，地址= 0X48）

Question

I'm new in Swift. I am trying to Run this code but got an error:

Thread 1: EXC_BAD_ACCESS (code=1, address=0x48) a.

Error appears here:

self.player.play()

Can anyone help in this issue?

import UIKit
import AVFoundation


class ViewController: UIViewController {

var player = AVAudioPlayer()

override func viewDidLoad() {
    super.viewDidLoad()

    do {
        if let audioPath = Bundle.main.path(forResource: "music", ofType: "mp3") {
           try player = AVAudioPlayer(contentsOf: URL(fileURLWithPath: audioPath))
        }

    } catch {
        print("ERROR")
    }

    self.player.play()
}

Answer 1

What you doing with your code is:

1. Creating an instance of AVAudioPlayer without any data
2. Trying to create a new instance with some data from music.mp3 file
3. Playing it

If the audioPath is not correct, then the player is not correctly created: application will use the one without valid data, leading to a crash during playback.

Your code can be written making the player optional , which helps preventing the crash:

import UIKit
import AVFoundation

class ViewController: UIViewController {

    var player: AVAudioPlayer?

    override func viewDidLoad() {
        super.viewDidLoad()

        player = initializePlayer()
        player?.play()
    }

    private func initializePlayer() -> AVAudioPlayer? {
        guard let path = Bundle.main.path(forResource: "music", ofType: "mp3") else {
            return nil
        }

        return try? AVAudioPlayer(contentsOf: URL(fileURLWithPath: path))
    }
}

Some changes performed to the code:

• player is now optional : there is no need to initialize it twice. Plus if the initialization goes well you can use it without problems, otherwise your app won't crash.
• The play method is now in an optional chain
• I've moved the initialization of the player in a separate private methods, to maintain the code readable. Feel free to change it, it is just a suggestion.

Answer 2

I've got it. The issue is that the file isn't being coping to my app bundle. To fix it:

1. Click your project
2. Click your target
3. Select Build Phases
4. Expand Copy Bundle Resources
5. Click '+' and select your file.

Thanks Denis Hennessy