Playing a Sound While App Runs - ios

Question

EDITED
still not sure whats wrong please help
hi there I'm creating and iOS application and trying to make it play a sound when running I've type up my code in the app delegate .h , .m and it plays the sound fine but the thing is it goes to a black screen when my ViewController.xib has a blue background heres heres the code i have
AppDelegate.h
#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>
#class ViewController;
#interface AppDelegate : NSObject <UIApplicationDelegate, AVAudioPlayerDelegate> {
UIWindow *window;
ViewController *viewController;
AVAudioPlayer *_backgroundMusicPlayer;
BOOL _backgroundMusicPlaying;
BOOL _backgroundMusicInterrupted;
UInt32 _otherMusicIsPlaying;
}
#property (nonatomic, retain) IBOutlet UIWindow *window;
#property (nonatomic, retain) IBOutlet ViewController *viewController;
- (void)tryPlayMusic;
AppDelegate.m
#import "AppDelegate.h"
#import "ViewController.h"
#implementation AppDelegate
#synthesize window = _window;
#synthesize viewController = _viewController;
- (void)applicationDidFinishLaunching:(UIApplication *)application {
// Set up the audio session
// See handy chart on pg. 55 of the Audio Session Programming Guide for what the categories mean
// Not absolutely required in this example, but good to get into the habit of doing
// See pg. 11 of Audio Session Programming Guide for "Why a Default Session Usually Isn't What You Want"
NSError *setCategoryError = nil;
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryAmbient error:&setCategoryError];
// Create audio player with background music
NSString *ticktockPath = [[NSBundle mainBundle] pathForResource:#"ticktock" ofType:#"wav"];
NSURL *ticktockURL = [NSURL fileURLWithPath:ticktockPath];
NSError *error;
_backgroundMusicPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:ticktockURL error:&error];
[_backgroundMusicPlayer setDelegate:self]; // We need this so we can restart after interruptions
[_backgroundMusicPlayer setNumberOfLoops:-1]; // Negative number means loop forever
// Override point for customization after app launch
[window addSubview:viewController.view];
[window makeKeyAndVisible];
}
- (void) audioPlayerBeginInterruption: (AVAudioPlayer *) player {
_backgroundMusicInterrupted = YES;
_backgroundMusicPlaying = NO;
}
- (void) audioPlayerEndInterruption: (AVAudioPlayer *) player {
if (_backgroundMusicInterrupted) {
[self tryPlayMusic];
_backgroundMusicInterrupted = NO;
}
}
- (void)applicationDidBecomeActive:(NSNotification *)notification {
[self tryPlayMusic];
}
- (void)tryPlayMusic {
// Play the music if no other music is playing and we aren't playing already
if (_otherMusicIsPlaying != 1 && !_backgroundMusicPlaying) {
[_backgroundMusicPlayer prepareToPlay];
[_backgroundMusicPlayer play];
_backgroundMusicPlaying = YES;
}
}
- (void)dealloc {
[viewController release];
[window release];
[super dealloc];
}
#end
ok so thats all the code
and heres what i get when app loads and the sound works fine
and this is what i want to get (ViewController.xib)
Thank in advanced
- (void)applicationDidFinishLaunching:(UIApplication *)application {
NSError *setCategoryError = nil;
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryAmbient error:&setCategoryError];
self.viewController = [[ViewController alloc] init];
// Create audio player with background music
NSString *ticktockPath = [[NSBundle mainBundle] pathForResource:#"ticktock" ofType:#"wav"];
NSURL *ticktockURL = [NSURL fileURLWithPath:ticktockPath];
NSError *error;
_backgroundMusicPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:ticktockURL error:&error];
[_backgroundMusicPlayer setDelegate:self]; // We need this so we can restart after interruptions
[_backgroundMusicPlayer setNumberOfLoops:-1]; // Negative number means loop forever
// Override point for customization after app launch
[window addSubview:viewController.view];
[window makeKeyAndVisible];
}
new code
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
// Override point for customization after application launch.
self.viewController = [[[ViewController alloc] initWithNibName:#"ViewController" bundle:nil] autorelease];
self.window.rootViewController = self.viewController;
[self.window makeKeyAndVisible];
return YES;
}

Answer 1

You never initialized your view controller.
Somewhere before you do
[window addSubview:viewController.view];
You need to do
self.viewController = [[ViewController alloc] init];
I see that you declared the property as an IBOutlet.. is it actually hooked up to something in Interface Builder?
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
NSError *setCategoryError = nil;
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryAmbient error:&setCategoryError];
// Create audio player with background music
NSString *ticktockPath = [[NSBundle mainBundle] pathForResource:#"ticktock" ofType:#"wav"];
NSURL *ticktockURL = [NSURL fileURLWithPath:ticktockPath];
NSError *error;
_backgroundMusicPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:ticktockURL error:&error];
[_backgroundMusicPlayer setDelegate:self]; // We need this so we can restart after interruptions
[_backgroundMusicPlayer setNumberOfLoops:-1]; // Negative number means loop forever
self.viewController = [[[ViewController alloc] initWithNibName:#"ViewController" bundle:nil] autorelease];
self.window.rootViewController = self.viewController;
[self.window makeKeyAndVisible];
return YES;
}
Copy that function and just delete this one - (void)applicationDidFinishLaunching:(UIApplication *)application completely.
You should also consider converting your project to use ARC. It will remove the need to retain/release/autorelease statements.

Answer 2

You have two targets - are all your resources included in the target that you're building?