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我掙扎了好幾天，現在把這個東西排除出去，根本找不到方法。我想在應用程序退出時播放背景音樂，或者當我點擊鏈接時轉到Safari，但我不會轉到背景模式。請幫忙。背景音頻不會播放
FirstViewController.h文件：
#import <AudioToolbox/AudioToolbox.h>
#import <AVFoundation/AVAudioPlayer.h>
#import <AVFoundation/AVFoundation.h>
@interface RygestopFirstViewController : UIViewController <AVAudioPlayerDelegate> {
IBOutlet UIButton *playButton;
IBOutlet UISlider *volumeSlider;
IBOutlet UISlider *progressBar;
IBOutlet UILabel *currentTime;
IBOutlet UILabel *duration;
AVAudioPlayer *player;
UIImage *playBtnBG;
UIImage *pauseBtnBG;
NSTimer *updateTimer;
BOOL inBackground;
}
- (IBAction)playButtonPressed:(UIButton*)sender;
- (IBAction)volumeSliderMoved:(UISlider*)sender;
- (IBAction)progressSliderMoved:(UISlider*)sender;
@property (nonatomic, retain) UIButton *playButton;
@property (nonatomic, retain) UISlider *volumeSlider;
@property (nonatomic, retain) UISlider *progressBar;
@property (nonatomic, retain) UILabel *currentTime;
@property (nonatomic, retain) UILabel *duration;
@property (nonatomic, retain) NSTimer *updateTimer;
@property (nonatomic, assign) AVAudioPlayer *player;
@property (nonatomic, assign) BOOL inBackground;
@end
FirstViewController.m代碼：
// amount to skip on rewind or fast forward
#define SKIP_TIME 1.0
// amount to play between skips
#define SKIP_INTERVAL .2
@implementation RygestopFirstViewController
@synthesize playButton;
@synthesize volumeSlider;
@synthesize progressBar;
@synthesize currentTime;
@synthesize duration;
@synthesize updateTimer;
@synthesize player;
@synthesize inBackground;
-(void)updateCurrentTimeForPlayer:(AVAudioPlayer *)p
{
currentTime.text = [NSString stringWithFormat:@"%d:%02d", (int)p.currentTime/60, (int)p.currentTime % 60, nil];
progressBar.value = p.currentTime;
}
- (void)updateCurrentTime
{
[self updateCurrentTimeForPlayer:self.player];
}
- (void)updateViewForPlayerState:(AVAudioPlayer *)p
{
[self updateCurrentTimeForPlayer:p];
if (updateTimer)
[updateTimer invalidate];
if (p.playing)
{
[playButton setImage:((p.playing == YES) ? pauseBtnBG : playBtnBG) forState:UIControlStateNormal];
updateTimer = [NSTimer scheduledTimerWithTimeInterval:.01 target:self selector:@selector(updateCurrentTime) userInfo:p repeats:YES];
}
else
{
[playButton setImage:((p.playing == YES) ? pauseBtnBG : playBtnBG) forState:UIControlStateNormal];
updateTimer = nil;
}
}
- (void)updateViewForPlayerStateInBackground:(AVAudioPlayer *)p
{
[self updateCurrentTimeForPlayer:p];
if (p.playing)
{
[playButton setImage:((p.playing == YES) ? pauseBtnBG : playBtnBG) forState:UIControlStateNormal];
}
else
{
[playButton setImage:((p.playing == YES) ? pauseBtnBG : playBtnBG) forState:UIControlStateNormal];
}
}
-(void)updateViewForPlayerInfo:(AVAudioPlayer*)p
{
duration.text = [NSString stringWithFormat:@"%d:%02d", (int)p.duration/60, (int)p.duration % 60, nil];
progressBar.maximumValue = p.duration;
volumeSlider.value = p.volume;
}
-(void)pausePlaybackForPlayer:(AVAudioPlayer*)p
{
[p pause];
[self updateViewForPlayerState:p];
}
-(void)startPlaybackForPlayer:(AVAudioPlayer*)p
{
if ([p play])
{
[self updateViewForPlayerState:p];
}
else
NSLog(@"Could not play %@\n", p.url);
}
- (IBAction)playButtonPressed:(UIButton *)sender
{
if (player.playing == YES)
[self pausePlaybackForPlayer: player];
else
[self startPlaybackForPlayer: player];
}
- (IBAction)volumeSliderMoved:(UISlider *)sender
{
player.volume = [sender value];
}
- (IBAction)progressSliderMoved:(UISlider *)sender
{
player.currentTime = sender.value;
[self updateCurrentTimeForPlayer:player];
}
- (void)dealloc
{
[super dealloc];
[playButton release];
[volumeSlider release];
[progressBar release];
[currentTime release];
[duration release];
[updateTimer release];
[player release];
[playBtnBG release];
[pauseBtnBG release];
}
#pragma mark AVAudioPlayer delegate methods
- (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)p successfully:(BOOL)flag
{
if (flag == NO)
NSLog(@"Playback finished unsuccessfully");
[p setCurrentTime:0.];
if (inBackground)
{
[self updateViewForPlayerStateInBackground:p];
}
else
{
[self updateViewForPlayerState:p];
}
}
- (void)playerDecodeErrorDidOccur:(AVAudioPlayer *)p error:(NSError *)error
{
NSLog(@"ERROR IN DECODE: %@\n", error);
}
// we will only get these notifications if playback was interrupted
- (void)audioPlayerBeginInterruption:(AVAudioPlayer *)p
{
NSLog(@"Interruption begin. Updating UI for new state");
// the object has already been paused, we just need to update UI
if (inBackground)
{
[self updateViewForPlayerStateInBackground:p];
}
else
{
[self updateViewForPlayerState:p];
}
}
- (void)audioPlayerEndInterruption:(AVAudioPlayer *)p
{
NSLog(@"Interruption ended. Resuming playback");
[self startPlaybackForPlayer:p];
}
#pragma mark background notifications
- (void)registerForBackgroundNotifications
{
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(setInBackgroundFlag)
name:UIApplicationWillResignActiveNotification
object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(clearInBackgroundFlag)
name:UIApplicationWillEnterForegroundNotification
object:nil];
}
- (void)setInBackgroundFlag
{
inBackground = true;
}
- (void)clearInBackgroundFlag
{
inBackground = false;
}
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
self.title = NSLocalizedString(@"Play", @"First");
self.tabBarItem.image = [UIImage imageNamed:@"Home"];
}
return self;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
//Make sure we can recieve remote control events
- (BOOL)canBecomeFirstResponder {
return YES;
}
#pragma mark - View lifecycle
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
playBtnBG = [[UIImage imageNamed:@"Player.png"] retain];
pauseBtnBG = [[UIImage imageNamed:@"Pause.png"] retain];
[playButton setImage:playBtnBG forState:UIControlStateNormal];
[self registerForBackgroundNotifications];
updateTimer = nil;
duration.adjustsFontSizeToFitWidth = YES;
currentTime.adjustsFontSizeToFitWidth = YES;
progressBar.minimumValue = 0.0;
// Load the the sample file, use mono or stero sample
NSURL *fileURL = [[NSURL alloc] initFileURLWithPath: [[NSBundle mainBundle] pathForResource:@"Sound1" ofType:@"m4a"]];
self.player = [[AVAudioPlayer alloc] initWithContentsOfURL:fileURL error:nil];
if (self.player)
{
[self updateViewForPlayerInfo:player];
[self updateViewForPlayerState:player];
player.numberOfLoops = 0;
player.delegate = self;
}
[fileURL release];
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
}
- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
}
- (void)viewDidDisappear:(BOOL)animated
{
[super viewDidDisappear:animated];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}
@end
而且，順便說一句，我想運行在薄標籤欄的應用程序，所以背景模式必須是總是存在。
[使用AVPlayer播放音頻的播放無法在後臺運行]（http://stackoverflow.com/questions/8807914/airplay-of-audio-using-avplayer-does-not-work-in-背景） – bryanmac 2012-03-05 11:45:39
THx的信息。但是，在哪裏放這個代碼？我是一個n00b編程，所以請幫助。 – Smugl3r 2012-03-05 11:51:22