How do I stop a sound using a button set to play in viewDidLoad?

[Whitehk]

Hi. I'm trying to play background music for my game, and I want the user to be able to mute the sound by pressing a button. The only problem with this is that I made the sound start playing (and looping) in the viewDidLoad method in my ViewController.m file. I set up an IBAction to stop the sound, but obviously I can't put an IBAction in my viewDidLoad method and have it work correctly. If I put it outside of the viewDidLoad method though, it will give me an error saying that backgroundMusic is undeclared. Here are some snippets of my code to give you a clearer picture:

my viewDidLoad method:

- (void)viewDidLoad {
[super viewDidLoad];
NSString *backgroundMusicPath = [[NSBundle mainBundle] pathForResource: @"Xtreme Pong Background" ofType: @"wav"];
NSURL *backgroundMusicURL = [[NSURL alloc] initFileURLWithPath:backgroundMusicPath];
AVAudioPlayer *backgroundMusic = [[AVAudioPlayer alloc] initWithContentsOfURL:backgroundMusicURL error:nil];
[backgroundMusic play];
backgroundMusic.numberOfLoops = -1;
}

My IBAction used to stop the sound:

-(IBAction)muteButton:(UIButton *)button; {
[backgroundMusic stop];
}
_________________________________________
If there's anyway I could start the sound at the app's startup and be able to mute it with a button, I'm open for ideas. Thanks!

[davejas69]

I did this in my game.
I had a screen with 3 buttons for "new game" "how to play" and "story".
I loaded a background music(in the code below) in my viewDidLoad
and simply stopped it as part of the IBAction associated with each of
the buttons as you mention that you tried to do.
It worked fine for me.







NSURL *url = [NSURL fileURLWithPath:[NSString stringWithFormat:@"%@/western.wav", [[NSBundle mainBundle] resourcePath]]];

NSError *error;
audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error];
audioPlayer.numberOfLoops = -1;

if (audioPlayer == nil)
NSLog([error description]);
else
[audioPlayer play];

}

[Whitehk]

Originally Posted by davejas69

I did this in my game.
I had a screen with 3 buttons for "new game" "how to play" and "story".
I loaded a background music(in the code below) in my viewDidLoad
and simply stopped it as part of the IBAction associated with each of
the buttons as you mention that you tried to do.
It worked fine for me.







NSURL *url = [NSURL fileURLWithPath:[NSString stringWithFormat:@"%@/western.wav", [[NSBundle mainBundle] resourcePath]]];

NSError *error;
audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error];
audioPlayer.numberOfLoops = -1;

if (audioPlayer == nil)
NSLog([error description]);
else
[audioPlayer play];

}

Like you said, I have tried this. If I put the IBAction in my ViewDidLoad method it simply doesn't work. If I put it outside of it, it says that backgroundMusic is undeclared. I guess my new question would be: Why would it be saying that backgroundMusic is undeclared?

[davejas69]

Ok well I can review what I did to make mine work, maybe you can recreate it...
in .h ....

#import <UIKit/UIKit.h>
#import <AVFoundation/AVAudioPlayer.h>
#import <AudioToolbox/AudioServices.h>

@interface GameshellViewController : UIViewController {
IBOutlet UIButton *newGameButton;
IBOutlet UIButton *howToPlayButton;
IBOutlet UIButton *storyButton;

AVAudioPlayer *audioPlayer;
}
-(IBAction) newGameButtonActionid) sender;
-(IBAction) howToPlayButtonActionid) sender;
-(IBAction) storyButtonActionid) sender;





@property (nonatomic, retain) AVAudioPlayer *audioPlayer;

@property(nonatomic,retain) IBOutlet UIButton *newGameButton;
@property(nonatomic,retain) IBOutlet UIButton *howToPlayButton;
@property(nonatomic,retain) IBOutlet UIButton *storyButton;



-(void)myclick2;

@end

////////////////////////////////////////////////////////////////////////////
Then you have to import the AudioToolbox .framework and remember NOT to check
the box that asks to "copy items into destination group folder"

In your .m file, synthesize your audioPlayer.
Beyond checking those things, not sure what else it can be.
Hope it helped.