初始屏幕或启动屏幕中的声音

Question

我想在显示初始屏幕时添加声音，当转向主屏幕时正在播放其他声音吗？我的问题是，当初始屏幕出现时，我应该在哪里指定用于产生声音的声音代码？

Answer 1

Put in your application didFinishLaunching but be sure to instantiate it in you .h and .m.

Something like this should do your problem:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{

    NSString* resourcePath = [[NSBundle mainBundle] resourcePath];
    resourcePath = [resourcePath stringByAppendingString:@"/YOURMUSICNAME.mp3"];
    NSLog(@"Path to play: %@", resourcePath);
    NSError* err;

    //Initialize our player pointing to the path to our resource
    player = [[AVAudioPlayer alloc] initWithContentsOfURL:
                 [NSURL fileURLWithPath:resourcePath] error:&err];

    if( err ){
        //bail!
        NSLog(@"Failed with reason: %@", [err localizedDescription]);
    }
    else{
        //set our delegate and begin playback
        player.delegate = self;
        [player play];
        player.numberOfLoops = -1;
        player.currentTime = 0;
        player.volume = 1.0;
    }
}

Then if you want to stop it:

[player stop];

or pause it :

[player pause];

and also import it in your header file:

#import <AVFoundation/AVFoundation.h>

and add this to your header ......

@interface ViewController : UIViewController <AVAudioPlayerDelegate>

Answer 2

i Guess you can try this :

First of all Add AVFoundation.Framework in your project

in AppDelegate.m

- (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.navigate = [[UINavigationController alloc]initWithRootViewController:_viewController];
  self.window.rootViewController = self.navigate;
  [self.window makeKeyAndVisible];

 // Add this line to present splash;
  [self.viewController displayScreen];

  return YES;
 }

Then in your rootViewController ie your first viewController

in .h

Add this Frame work

#import <AVFoundation/AVFoundation.h>

 AVAudioPlayer *avSound; //define this

-(void)displayScreen;
-(void)removeScreen;

and then add these two methods in your .m

-(void)displayScreen
{
   UIView *splashView = [[[UIView alloc]initWithFrame:CGRectMake(0, 0, 320, 480)]autorelease];
   splashView.backgroundColor = [UIColor colorWithPatternImage:[UIImage 
   imageNamed:@"Default.png"]];
   UIViewController *displayViewController=[[UIViewController alloc] init];
displayViewController.view = splashView;
[self presentModalViewController:displayViewController animated:NO];

      NSURL *soundURL = [[NSBundle mainBundle]  
     URLForResource:@"soundFile"withExtension:@"mp3/caf or whatever"];
      avSound = [[AVAudioPlayer alloc] initWithContentsOfURL:soundURL error:nil];
     [avSound play];//play sound;

    [self performSelector:@selector(removeScreen) withObject:nil afterDelay:4.0];


 }

 -(void)removeScreen
  {
   [[self modalViewController] dismissModalViewControllerAnimated:YES];

     if ([avSound isPlaying])
       [avSound stop];//stop playing sound;
  }

then release it in

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

Its working for me,hope helps you too.