我正在使用AVAudio播放器框架在iPhone中使用音频播放器。我的问题是当我选择暂停按钮并再次播放按钮时它应该从启动开始。我想暂停播放该歌曲并继续使用iphone时的持续时间点编程。当我试图暂停这首歌时,我又想开始播放我暂停的歌曲。 我正在写这样的代码..
-(void)playOrPauseButtonPressed:(id)sender
{
if(playing==NO)
{
[playButton setBackgroundImage:[UIImage imageNamed:@"Pause.png"] forState:UIControlStateNormal];
// Here Pause.png is a image showing Pause Button.
NSError *err=nil;
AVAudioSession *audioSession=[AVAudioSession sharedInstance];
[audioSession setCategory:AVAudioSessionCategoryPlayback error:nil];
NSLog(@"%@ %d",urlsArray,selectedIndex);
NSString *sourcePath=[urlsArray objectAtIndex:selectedIndex];
NSData *objectData=[NSData dataWithContentsOfURL:[NSURL URLWithString:sourcePath]];
NSLog(@"%@",objectData);
audioPlayer = [[AVAudioPlayer alloc] initWithData:objectData error:&err];
if(err)
{
NSLog(@"Error %ld,%@",(long)err.code,err.localizedDescription);
}
NSTimeInterval bufferDuration=0.005;
[audioSession setPreferredIOBufferDuration:bufferDuration error:&err];
if(err)
{
NSLog(@"Error %ld, %@", (long)err.code, err.localizedDescription);
}
double sampleRate = 44100.0;
[audioSession setPreferredSampleRate:sampleRate error:&err];
if(err)
{
NSLog(@"Error %ld, %@",(long)err.code,err.localizedDescription);
}
[audioSession setActive:YES error:&err];
if(err)
{
NSLog(@"Error %ld,%@", (long)err.code, err.localizedDescription);
}
sampRate=audioSession.sampleRate;
bufferDuration=audioSession.IOBufferDuration;
NSLog(@"SampeRate:%0.0fHZI/OBufferDuration:%f",sampleRate,bufferDuration);
audioPlayer.numberOfLoops = 0;
[audioPlayer prepareToPlay];
[audioPlayer play];
audioPlayer.delegate=self;
if(!audioPlayer.playing)
{
[audioPlayer play];
}
playing=YES;
}
else if (playing==YES)
{
[playButton setBackgroundImage:[UIImage imageNamed:@"play12.png"] forState:UIControlStateNormal];
[audioPlayer pause];
playing=NO;
timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(updateViewForPlayerState) userInfo:nil repeats:YES];
}
if (self.audioPlayer)
{
[self updateViewForPlayerInfo];
[self updateViewForPlayerState];
[self.audioPlayer setDelegate:self];
}
}
-(void)updateViewForPlayerInfo
{
self.songDuration.text = [NSString stringWithFormat:@"%d:%02d", (int)self.audioPlayer.duration / 60, (int)self.audioPlayer.duration % 60, nil];
NSLog(@"%f", self.audioPlayer.duration);
self.progressBar.maximumValue = self.audioPlayer.duration;
self.volumeSlider.value = self.audioPlayer.volume;
}
-(void)audioPlayerBeginInterruption:(AVAudioPlayer *)player
{
if(playing)
{
playing=NO;
interruptedOnPlayback=YES;
[self updateViewForPlayerState];
}
}
-(void)audioPlayerEndInterruption:(AVAudioPlayer *)player
{
if(interruptedOnPlayback)
{
[audioPlayer prepareToPlay];
[audioPlayer play];
playing=YES;
interruptedOnPlayback=NO;
}
}
-(void)updateViewForPlayerState
{
[self updateCurrentTime];
if (self.updatedTimer)
{
[self.updatedTimer invalidate];
}
if (self.audioPlayer.playing)
{
self.updatedTimer = [NSTimer scheduledTimerWithTimeInterval:0.01 target:self selector:@selector(updateCurrentTime) userInfo:self.audioPlayer repeats:YES];
}
}
答案 0 :(得分:1)
在播放按钮操作中,请保留以下代码。
if(!isPlaying)
{
[playButton setBackgroundImage:[UIImage imageNamed:@"play.png"] forState:UIControlStateNormal];
[player stop];
isPlaying=YES;
}
else
{
[playButton setBackgroundImage:[UIImage imageNamed:@"pause.png"] forState:UIControlStateNormal];
[player play];
isPlaying=NO;
}
答案 1 :(得分:1)
看起来您的问题是,每次调用AVAudioPlayer
方法时,您都会重新创建- playOrPauseButtonPressed:
。
对于以下代码行:
NSError *err=nil;
AVAudioSession *audioSession=[AVAudioSession sharedInstance];
[audioSession setCategory:AVAudioSessionCategoryPlayback error:nil];
NSLog(@"%@ %d",urlsArray,selectedIndex);
NSString *sourcePath=[urlsArray objectAtIndex:selectedIndex];
NSData *objectData=[NSData dataWithContentsOfURL:[NSURL URLWithString:sourcePath]];
NSLog(@"%@",objectData);
audioPlayer = [[AVAudioPlayer alloc] initWithData:objectData error:&err];
尝试将它们包装在if语句中,这样只有在AVAudioPlayer
未初始化时才会调用它们,如下所示:
if (!audioPlayer){
NSError *err=nil;
AVAudioSession *audioSession=[AVAudioSession sharedInstance];
[audioSession setCategory:AVAudioSessionCategoryPlayback error:nil];
NSLog(@"%@ %d",urlsArray,selectedIndex);
NSString *sourcePath=[urlsArray objectAtIndex:selectedIndex];
NSData *objectData=[NSData dataWithContentsOfURL:[NSURL URLWithString:sourcePath]];
NSLog(@"%@",objectData);
audioPlayer = [[AVAudioPlayer alloc] initWithData:objectData error:&err];
}