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Editorial Team
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Asked: 2026-06-10T08:33:43+00:00

I have two problems. 1- I am using following code to add background music

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I have two problems.

1- I am using following code to add background music in my iphone app.

    - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
    {
        // Override point for customization after application launch.
        sleep(5);
         //this variable can be named differently

        NSString *path = [[NSBundle mainBundle] pathForResource:@"%@/background_music" ofType:@"wav"];


    // the file is stored in MyApp/SharedResources folder where as delegate is placed at MyApp/        
            backgroundSound =[[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path] 

error:nil];

        backgroundSound.delegate = self;

        [backgroundSound prepareToPlay];

        [backgroundSound play];

        backgroundSound.numberOfLoops = -1;


        return YES;
    }

    @interface AppDelegate : UIResponder <UIApplicationDelegate>{
        AVAudioPlayer *backgroundSound;

    }

By running this code i am getting build failed.Undefined symbols for architecture i386:

"_OBJC_CLASS_$_AVAudioPlayer", referenced from:
      objc-class-ref in AppDelegate.o
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)

My second problem..

Suppose I have to turn this music off in another viewController with a button. How can I do that. E.G SettingsViewController.

* thread #1: tid = 0x2c03, 0x90870c5a libSystem.dylib`__kill + 10, stop reason = signal SIGABRT
    frame #0: 0x90870c5a libSystem.dylib`__kill + 10
    frame #1: 0x90870c4c libSystem.dylib`kill$UNIX2003 + 32
    frame #2: 0x909035a5 libSystem.dylib`raise + 26
    frame #3: 0x909196e4 libSystem.dylib`abort + 93
    frame #4: 0x90895b1b libSystem.dylib`_Unwind_Resume + 59
    frame #5: 0x016c8e39 CoreFoundation`CFRunLoopRunSpecific + 345
    frame #6: 0x016c8ccb CoreFoundation`CFRunLoopRunInMode + 123
    frame #7: 0x0019e2a7 UIKit`-[UIApplication _run] + 576
    frame #8: 0x0019fa9b UIKit`UIApplicationMain + 1175
    frame #9: 0x00002a62 myApp`main + 130 at main.m:16
    frame #10: 0x000029d5 myApp`start + 53

Best Regards

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1 Answer

  1. Editorial Team

    This is a linker error, you have to link against the AVFoundation framework.

    To stop the playback from another class/instance/wherever you want, you can have multiple solutions:

    One. Declare a property on the class you want to stop the playback from, and set that property to the original view controller. Then access that view controller using the property and call a method on it to stop the music.

    Two. In some central class, such as your app delegate or main view controller, add an NSNotificationCenter-observer and simply use notifications throughout your app without messing with properties.

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