How do i fix this warning?

[BillyGiggles]

When i play a sound using the code..

- (IBAction)JazzBass{
	
	NSString *path = [[NSBundle mainBundle] pathForResource:@"JazzBass" ofType:@"mp3"];
	AVAudioPlayer* theAudio = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path] error:NULL];
	theAudio.delegate = self;
	
	[theAudio play];
	
}

The warning is on the line that says..

theAudio.delegate = self;

The warning is..


warning: class 'jazzDrumsCowbellLeft' does not implement the 'AVAudioPlayerDelegate' protocol

Any one know how to fix it?

thanks

[Chessin]

I have the same problem and its really annoying, please someone help us out.

[dudeofswim]

Originally Posted by Chessin

I have the same problem and its really annoying, please someone help us out.

Me too! I dont worry about it htough

Tutorial: Easy Audio Playback With AVAudioPlayer

[RLScott]

Originally Posted by BillyGiggles

The warning is..


warning: class 'jazzDrumsCowbellLeft' does not implement the 'AVAudioPlayerDelegate' protocol

Any one know how to fix it?

thanks

Post your interface declaration of jazzDrumsCowbellLeft class.

[BillyGiggles]

Uh well im playing around 150 sounds and they all have this warning
This is my whole .h file (for one class)

@interface jazzDrumsCowbellLeft : UIViewController {

}

-(IBAction)highSound;
-(IBAction)lowSound;
- (IBAction)goJazzSet;
- (IBAction)JazzBass;
- (IBAction)JazzCrash;
- (IBAction)JazzHiTom;
- (IBAction)JazzLowTom;
- (IBAction)JazzRide;
- (IBAction)JazzMidTom;
- (IBAction)RideBell;
- (IBAction)brush1;
- (IBAction)brush2;
- (IBAction)hihatO;
- (IBAction)hihatC;
- (IBAction)Snare;
- (IBAction)goBack;

[Duncan C]

Originally Posted by BillyGiggles

When i play a sound using the code..

- (IBAction)JazzBass{
	
	NSString *path = [[NSBundle mainBundle] pathForResource:@"JazzBass" ofType:@"mp3"];
	AVAudioPlayer* theAudio = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path] error:NULL];
	theAudio.delegate = self;
	
	[theAudio play];
	
}

The warning is on the line that says..

theAudio.delegate = self;

The warning is..


warning: class 'jazzDrumsCowbellLeft' does not implement the 'AVAudioPlayerDelegate' protocol

Any one know how to fix it?

thanks

The compiler is telling you exactly what you need to do. The jazzDrumsCowbellLeft class needs to implement the AVAudioPlayerDelegate protocol. To add a protocol to an object, you need to do a couple of things. First, add the protocol to the interface for your class, like this:


@interface jazzDrumsCowbellLeft : parentClass <AVAudioPlayerDelegate>


Replace "parentClass" with whatever class your jazzDrumsCowbellLeft class inherits from.

The protocol(s) your class supports go inside the angle brackets, separated by commas. In this case we're only listing one protocol, AVAudioPlayerDelegate.

The next step is to look up the AVAudioPlayerDelegate protocol in the XCode docs and see what methods you need to implement to support that protocol.

Checking the docs, it says:

"The delegate of an AVAudioPlayer object must adopt the AVAudioPlayerDelegate protocol. All of the methods in this protocol are optional. They allow a delegate to respond to audio interruptions and audio decoding errors, and to the completion of a sound’s playback."

Since all the methods are optional, you don't HAVE to implement any of them. The audioPlayerDidFinishPlaying:successfully: is probably the most useful delegate method - it lets you get notified when the sound finishes playing. This would let you play a list of sounds one right after the other, for example.

[BillyGiggles]

Hey thanks for helping out but since im still a noob what is a "parentClass"

Also where would i put the audioPlayerDidFinishPlaying:successfully:

Would i put it in..

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
    [super viewDidLoad];
}

Thats just a guess

[RLScott]

Originally Posted by BillyGiggles

Hey thanks for helping out but since im still a noob what is a "parentClass"...

It is the class from which the class in question inherits. In your case, you have defined jazzDrumsCowbellLeft with UIViewController as the parent class.

If you don't already have a book on Objective C, I recommend "Programming in Objective-C" by Stephen G. Kochan.

[rickrets]

Originally Posted by BillyGiggles

Hey thanks for helping out but since im still a noob what is a "parentClass"

Also where would i put the audioPlayerDidFinishPlaying:successfully:

Would i put it in..

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
    [super viewDidLoad];
}

Thats just a guess

It's a method on it's own,

It would somewhat look like this:

- (void)audioPlayerDidFinishPlaying:successfully: {
//
//put code to play next sound, like Duncan said..
//
}

[Batman]

Originally Posted by rickrets

- (void)audioPlayerDidFinishPlaying:successfully: {
//
//put code to play next sound, like Duncan said..
//
}

Would be more like

- (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag {
//
//put code to play next sound, like Duncan said..
//
}