Playing Audio when App Launches

ColouredRobot · 12-25-2009, 05:49 PM

I was wondering what was the best way to play audio at the beginning of the app, without having any build errors or warnings.

The way I approached it works, but gives me a warning.

Quote:

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

So I imported the AV Foundation Framework into my project called "SoundAudio." In my SoundAudioViewController.m I entered the following code:

Code:

@implementation SoundAudioViewController
- (void)awakeFromNib {
		NSString *path = [[NSBundle mainBundle]	pathForResource:@"startApp" ofType:@"wav"];
		AVAudioPlayer* theAudio = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path]error:NULL];
		theAudio.delegate = self;
		[theAudio play];
		
}

Is there a better way? Thanks!

bobbypage · 12-25-2009, 08:05 PM

You get the warning because you didn't declare that you are using the AVFoundation in your .h

simpsonaty · 12-25-2009, 08:14 PM

i play audio sound a little differently than you.

Add the AVFoundation framework into your project, then in the header of the main view, import the AVFoundation/AVFoundation.h.

Code:

#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>

@interface SoundAudioViewController : UIViewController {
	AVAudioPlayer *audioPlayer;
}

@end

then in the -(void)awakeFromNib method, add the following code. Don't forget to change the "audiofile.mp3" to the name of your .mp3 file.

Code:

-(void)awakeFromNib {

NSURL *url = [NSURL fileURLWithPath:[NSString stringWithFormat:@"%@/audiofile.mp3", [[NSBundle mainBundle] resourcePath]]];

	NSError *error;
	audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error];
	audioPlayer.numberOfLoops = 0;
	[audioPlayer play];

}

Don't forget to release the audioPlayer in the dealloc

Code:

- (void)dealloc {
	[audioPlayer release];
	[super dealloc];
}

You can use this code in an -(IBAction), or under any other code, such as the didSelectRowAtIndexPath, etc.

bobbypage · 12-25-2009, 08:14 PM

To clarify, your header (.h) file should look something like this. Then you won't get any warnings

ColouredRobot · 12-26-2009, 12:34 AM

@simpsonaty I followed your way, and it worked perfectly. I have a question concerning a new sound.

Code:

You can use this code in an -(IBAction), or under any other code, such as the didSelectRowAtIndexPath, etc.

How would I code it correctly. I want to make a sound when I slide an object to the right. The code is already fixed for it. But when I run it the sound does not play. Am I inserting the audio code correctly? Thank you!

Code:

- (void) sliderAction: (UISlider *) sender
{
		if (customSlider.value != 1.0)  //if the value is not the max, slide this bad boy back to zero
		{
				[sender setValue: 0 animated: YES];
		}
		else {	
				if (customSlider.value == 1.0)  //if the value is max, slide this bad boy back to zero and execute code
				{
						[sender setValue: 0 animated: NO];
        }
				// the rest of your code here.
				NSURL *url = [NSURL fileURLWithPath:[NSString stringWithFormat:@"%@/installChime.wav", [[NSBundle mainBundle] resourcePath]]];
				
				NSError *error;
				audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error];
				audioPlayer.numberOfLoops = 0;
				[audioPlayer play];
				
		}
}

simpsonaty · 12-26-2009, 02:39 AM

I'm not sure why the code doesn't work, I tried it myself and it worked. Does the app build successfully in the simulator? If it does, try looking at this site: AVAudioPlayer Plugin

ColouredRobot · 12-26-2009, 03:13 AM

Quote:

Originally Posted by simpsonaty

I'm not sure why the code doesn't work, I tried it myself and it worked. Does the app build successfully in the simulator? If it does, try looking at this site: AVAudioPlayer Plugin

Well I've tried it on my device, and it does load successfully on both the simulator and the device, but I hear no sound when I slide the button all the way to the right, and it isn't the slider problem, so it must be me not implementing the audio code correctly.

Here's my MainViewController.h file

Code:

//
//  MainViewController.h
//  Unpackr
//
//  Created by Victor Alexander on 12/22/09.
//  Copyright __MyCompanyName__ 2009. All rights reserved.
//

#import "FlipsideViewController.h"
#import <AVFoundation/AVFoundation.h>

@interface MainViewController : UIViewController <FlipsideViewControllerDelegate> {

		UISlider *customSlider;
		AVAudioPlayer *audioPlayer;
}

- (IBAction)showInfo;

@end

Here's my MainViewController.m file

Code:

//
//  MainViewController.m
//  Unpackr
//
//  Created by Victor Alexander on 12/22/09.
//  Copyright __MyCompanyName__ 2009. All rights reserved.
//
#import <AVFoundation/AVFoundation.h>
#import "MainViewController.h"
#import "MainView.h"



@implementation MainViewController


- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
    if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) {
        // Custom initialization
    }
    return self;
}

- (void)create_Custom_UISlider
{
		CGRect frame = CGRectMake(0.00, 50.00, 315, 52.0);
		CGRect thumb = CGRectMake(0.00, 50.00, 71.0, 47.0);
		customSlider = [[UISlider alloc] initWithFrame:frame];
		[customSlider addTarget:self action:@selector(sliderAction:) forControlEvents:UIControlEventValueChanged];
		// in case the parent view draws with a custom color or gradient, use a transparent color
		customSlider.backgroundColor = [UIColor clearColor];	
		UIImage *stetchLeftTrack = [[UIImage imageNamed:@"sliderTrack.png"]
																stretchableImageWithLeftCapWidth:10.0 topCapHeight:0.0];
		UIImage *stetchRightTrack = [[UIImage imageNamed:@"sliderTrack.png"]
																 stretchableImageWithLeftCapWidth:10.0 topCapHeight:0.0];
		[customSlider setThumbImage: [UIImage imageNamed:@"sliderThumb.png"] forState:UIControlStateNormal];
		[customSlider setMinimumTrackImage:stetchLeftTrack forState:UIControlStateNormal];
		[customSlider setMaximumTrackImage:stetchRightTrack forState:UIControlStateNormal];
		[customSlider thumbRectForBounds: thumb trackRect: frame value: customSlider.value];
		customSlider.minimumValue = 0.0;
		customSlider.maximumValue = 100.0;
		customSlider.continuous = NO;
		customSlider.value = 5.0;
}



// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)viewDidLoad {
		[self create_Custom_UISlider];
		[self.view addSubview: customSlider];
		[super viewDidLoad];
}

- (void) sliderAction: (UISlider *) sender
{
		if (customSlider.value != 1.0)  //if the value is not the max, slide this bad boy back to zero
		{
				[sender setValue: 0 animated: YES];
		}
		else {	
				if (customSlider.value == 1.0)  //if the value is max, slide this bad boy back to zero and execute code
				{
						[sender setValue: 0 animated: NO];
        }
				// the rest of your code here.
				NSURL *url = [NSURL fileURLWithPath:[NSString stringWithFormat:@"%@/UnpackRip.wav", [[NSBundle mainBundle] resourcePath]]];
				
				NSError *error;
				audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error];
				audioPlayer.numberOfLoops = 0;
				[audioPlayer play];
				
		}
}

Am I missing something? I tried cleaning the project up, but it still doesn't play the sound when I slide.

ColouredRobot · 12-26-2009, 03:27 AM

Quote:

Originally Posted by ColouredRobot

Well I've tried it on my device, and it does load successfully on both the simulator and the device, but I hear no sound when I slide the button all the way to the right, and it isn't the slider problem, so it must be me not implementing the audio code correctly.

Here's my MainViewController.h file

Code:

//
//  MainViewController.h
//  Unpackr
//
//  Created by Victor Alexander on 12/22/09.
//  Copyright __MyCompanyName__ 2009. All rights reserved.
//

#import "FlipsideViewController.h"
#import <AVFoundation/AVFoundation.h>

@interface MainViewController : UIViewController <FlipsideViewControllerDelegate> {

		UISlider *customSlider;
		AVAudioPlayer *audioPlayer;
}

- (IBAction)showInfo;

@end

Here's my MainViewController.m file

Code:

//
//  MainViewController.m
//  Unpackr
//
//  Created by Victor Alexander on 12/22/09.
//  Copyright __MyCompanyName__ 2009. All rights reserved.
//
#import <AVFoundation/AVFoundation.h>
#import "MainViewController.h"
#import "MainView.h"



@implementation MainViewController


- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
    if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) {
        // Custom initialization
    }
    return self;
}

- (void)create_Custom_UISlider
{
		CGRect frame = CGRectMake(0.00, 50.00, 315, 52.0);
		CGRect thumb = CGRectMake(0.00, 50.00, 71.0, 47.0);
		customSlider = [[UISlider alloc] initWithFrame:frame];
		[customSlider addTarget:self action:@selector(sliderAction:) forControlEvents:UIControlEventValueChanged];
		// in case the parent view draws with a custom color or gradient, use a transparent color
		customSlider.backgroundColor = [UIColor clearColor];	
		UIImage *stetchLeftTrack = [[UIImage imageNamed:@"sliderTrack.png"]
																stretchableImageWithLeftCapWidth:10.0 topCapHeight:0.0];
		UIImage *stetchRightTrack = [[UIImage imageNamed:@"sliderTrack.png"]
																 stretchableImageWithLeftCapWidth:10.0 topCapHeight:0.0];
		[customSlider setThumbImage: [UIImage imageNamed:@"sliderThumb.png"] forState:UIControlStateNormal];
		[customSlider setMinimumTrackImage:stetchLeftTrack forState:UIControlStateNormal];
		[customSlider setMaximumTrackImage:stetchRightTrack forState:UIControlStateNormal];
		[customSlider thumbRectForBounds: thumb trackRect: frame value: customSlider.value];
		customSlider.minimumValue = 0.0;
		customSlider.maximumValue = 100.0;
		customSlider.continuous = NO;
		customSlider.value = 5.0;
}



// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)viewDidLoad {
		[self create_Custom_UISlider];
		[self.view addSubview: customSlider];
		[super viewDidLoad];
}

- (void) sliderAction: (UISlider *) sender
{
		if (customSlider.value != 1.0)  //if the value is not the max, slide this bad boy back to zero
		{
				[sender setValue: 0 animated: YES];
		}
		else {	
				if (customSlider.value == 1.0)  //if the value is max, slide this bad boy back to zero and execute code
				{
						[sender setValue: 0 animated: NO];
        }
				// the rest of your code here.
				NSURL *url = [NSURL fileURLWithPath:[NSString stringWithFormat:@"%@/UnpackRip.wav", [[NSBundle mainBundle] resourcePath]]];
				
				NSError *error;
				audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error];
				audioPlayer.numberOfLoops = 0;
				[audioPlayer play];
				
		}
}

Am I missing something? I tried cleaning the project up, but it still doesn't play the sound when I slide.

Hey I actually attempted to add sound to an info button, and it worked. It turns out the max value in my code was 1.0 but one line accidentally had it at 100.00 so it basically was a slider problem, oopsie! Thanks though!

simpsonaty · 12-26-2009, 04:38 AM

no worries