App crashes when playing audio on iOS13.1

问题

I am building an app that runs sound files from within the main bundle with a url. When I tested this on iOS 13, everything is fine. But with the new update of 13.1 I am getting an error here on the line of code

backgroundMusicPlayer = try AVAudioPlayer(contentsOf: URL(fileURLWithPath: sound!))

that says:

Thread 1: EXC_BAD_ACCESS (code=1, address=0x48

Here is the code that I am using in a custom class that runs background music when the app launches:

import Foundation
import AVFoundation

var backgroundMusicPlayer = AVAudioPlayer()

func playBackgroundMusic(filename: String){
let  sound = Bundle.main.path(forResource: filename, ofType: "m4a")

do{
    try     
AVAudioSession.sharedInstance().setCategory(AVAudioSession.Category.playback, mode: AVAudioSession.Mode.default, options: [AVAudioSession.CategoryOptions.mixWithOthers])
    backgroundMusicPlayer = try AVAudioPlayer(contentsOf: URL(fileURLWithPath: sound!))

}catch{
    print (error)
}
backgroundMusicPlayer.numberOfLoops = -1
backgroundMusicPlayer.prepareToPlay()
backgroundMusicPlayer.play()
}

This all works fine in the simulator on iOS13, but crashes on a device running 13.1 It appears that the url is the issue, but I am not sure why. This same behavior happens on other screens where buttons are triggering audio files from the bundle.

回答1:

Change this:

var backgroundMusicPlayer = AVAudioPlayer()

To this:

var backgroundMusicPlayer : AVAudioPlayer!

回答2:

AVAudioPlayer doesn't have an init so it should be removed.

Solution for swift

If you initialise your AVAudioPlayer like:

var musicPlayer: AVAudioPlayer = AVAudioPlayer()

musicPlayer = AVAudioPlayer()

in any method then remove it and declare like:

var musicPlayer: AVAudioPlayer!

Solution for Objective C

If you initalise like

AVAudioPlayer *musicPlayer = [[AVAudioPlayer alloc] init];

REMOVE the init part of [[AVAudioPlayer alloc] init] to look like

AVAudioPlayer *musicPlayer = [AVAudioPlayer alloc];

EDIT: If after this, your app pauses at that line, like you set the breakpoint there(but you didn't), but app run without problems after you click play/run, you shouldn't worry because it is some c level issue that doesn't affect the app. You can read more in this thread So solution for that is to edit the breakpoint for All Exception, change the exception type from "All" to "Objective-C exceptions"

Go to the Breakpoint navigator in Xcode.
Control-click on the 'All Exceptions' line.
Select the 'Edit Breakpoint...' option.
Change the Exception from All to Objective-C.

回答3:

Add below code in AppDelegate.swift

func application(_ application: UIApplication,
                 didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    // Override point for customization after application launch.

    let audioSession = AVAudioSession.sharedInstance()
    do {
        try audioSession.setCategory(AVAudioSession.Category.playback)
    }
    catch {
        print("Setting category to AVAudioSessionCategoryPlayback failed.")
    }
    return true
}

来源：https://stackoverflow.com/questions/58105462/app-crashes-when-playing-audio-on-ios13-1

标签

swift

avfoundation

ios13