Question

I have created a singleton for my MusicBackground. And I receive a line code of imcomplete implementation of this line @implementation MyBgMusic. Can anyone tell me why ? Below is the code:

#import "MyBgMusic.h"

static MyBgMusic *sharedMyManager = nil;

@implementation MyBgMusic

@synthesize player,playBgMusic;

#pragma mark -
#pragma mark Singleton Methods

+ (MyBgMusic*)sharedInstance {

    static MyBgMusic *_sharedInstance;
    if(!_sharedInstance) {
        static dispatch_once_t oncePredicate;
        dispatch_once(&oncePredicate, ^{
            _sharedInstance = [[super allocWithZone:nil] init];
            });
        }

        return _sharedInstance;
}

+ (id)allocWithZone:(NSZone *)zone {    

    return [self sharedInstance];
}


- (id)copyWithZone:(NSZone *)zone {
    return self;    
}

#if (!__has_feature(objc_arc))

- (id)retain {  

    return self;    
}

- (unsigned)retainCount {
    return UINT_MAX;  //denotes an object that cannot be released
}


- (id)autorelease {

    return self;    
}

- (void)dealloc
{
    [MyBgMusic release];
    [playBgMusic release];
    [player release];
    [super dealloc];
}
#endif

#pragma mark -
#pragma mark Custom Methods

- (void)viewDidLoad
{

    NSString *path = [[NSBundle mainBundle] pathForResource:@"music" ofType:@"mp3"];
    self.player=[[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path] error:NULL]; 
    player.delegate = self;
    [player play];
    player.numberOfLoops = -1;
    [super viewDidLoad];


}

@end

For the M file, below is the code:

#import <Foundation/Foundation.h>
#import <AVFoundation/AVAudioPlayer.h>

@interface MyBgMusic : UIViewController <AVAudioPlayerDelegate> {


    AVAudioPlayer *player;
    UIButton *playBgMusic;


}

@property (nonatomic, retain) IBOutlet AVAudioPlayer *player;
@property (nonatomic, retain) IBOutlet UIButton *playBgMusic;


+ (id)sharedManager;
-(IBAction) toggleMusic;


@end

And how do I reference to my toggle button: Below is the code :

- (IBAction)toggleMusic {

    if ([self.player isPlaying] == YES) {
        [self.player stop]; 
    } else {
        [self.player play];
    }
    self.playBgMusic.enabled = YES;

}   

Answer 1

That error means your @implementation section does not contain everything described in the @interface section.

I can see two problems.

First you need to place this code:

- (IBAction)toggleMusic {

    ...

}   

Somewhere in between @implementation and @end.

And you also need to rename the line + (MyBgMusic*)sharedInstance to + (id)sharedManager.

EDIT:

To access the toggle music method elsewhere in your code, you would do:

[[MyBgMusic sharedManager] toggleMusic];