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使用NSTimer iOS目标C暂停/播放音频播放器

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我正在开发一个音乐播放器App . 播放音频时使用播放/暂停按钮和进度条 . 我正在用NSTimer调用一个方法来更新进度条 . 我需要的是暂停进度条并将其恢复到停止的位置 .

我可以使用链接中引用的代码暂停计时器以及进度条：1 . How to pause a NSTimer? 2. How to Pause/Play NSTimer?

但我正在努力恢复它，因为我被迫离开了 . 我还需要根据音频更新进度条 .

My code is as below:

AVAudioPlayer *audioPlayer;
NSTimer *audioTimer;
BOOL play;

BOOL ispaused;
int seconds1;
int minutes1;
int hours1;

NSDate *pauseStart, *previousFireDate;

Play/Pause Button action:

- (IBAction)playSoundTapped:(id)sender
{
songUrl = [NSURL URLWithString:@"http://www.stephaniequinn.com/Music/Allegro%20from%20Duet%20in%20C%20Major.mp3"];

self.playerItem = [AVPlayerItem playerItemWithURL:songUrl];
self.player = [AVPlayer playerWithPlayerItem:self.playerItem];
self.player = [AVPlayer playerWithURL:songUrl];

if (play==YES)
{
    if (ispaused == YES)
    {
        float pauseTime = -1*[pauseStart timeIntervalSinceNow];
        [audioTimer setFireDate:[NSDate dateWithTimeInterval:pauseTime sinceDate:previousFireDate]];
        audioTimer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(updateProgress) userInfo:nil repeats:YES];

        [self.player play];

        ispaused = NO;
    }
    else
    {
        audioTimer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(updateProgress) userInfo:nil repeats:YES];

        [self.player play];

        ispaused = NO;
    }

    _playImg.image=[UIImage imageNamed:@"Pause.png"];
    play=NO;
}
else
{
    [self.player pause];

    ispaused = YES;

    pauseStart = [NSDate dateWithTimeIntervalSinceNow:0];
    previousFireDate = [audioTimer fireDate];
    [audioTimer setFireDate:[NSDate distantFuture]];

    _playImg.image=[UIImage imageNamed:@"Play.png"];
    play=YES;
}
}

Updates ProgressBar:

- (void)updateProgress
{
    if (ispaused == NO)
    {
        seconds1 += 1;

    if (seconds1 == 60)
    {
        seconds1 = 0;
        minutes1++;

        if (minutes1 == 60)
        {
            minutes1 = 0;
            hours1++;
        }
    }

    float duration = CMTimeGetSeconds([_playerItem duration]);
    float actDuration = duration/100;
    float currentTime = CMTimeGetSeconds([_player currentTime]);
    float minutes = currentTime/60;
    //float seconds = (currentTime - minutes) * 60;
    NSLog(@"Duration: %.2f",actDuration);
    NSLog(@"Current Time: %.2f",minutes);

    NSString *durStr = [NSString stringWithFormat: @"%f",duration];

    if ([durStr  isEqual: @"nan"])
    {
        NSLog(@"Nan");
    }
    else
    {
        [self setProgress:minutes animated:YES];
    }
}
else
{
      NSLog(@“Paused”);        
}
}

它正在重新启动音频而不是恢复 . 由于我是iOS的初学者，我不知道我在哪里做错了 . 请任何人帮助我......

ios audio nstimer avaudioplayer audio-player

2 回答

  • 1

    我在我的项目中做了什么，

    - (void)playPauseAudio : (UIButton*)sender{

if (!playPause.selected) {


    [audioPlayer play];

    sliderTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(updateSlider) userInfo:nil repeats:YES];
    [mySlider addTarget:self action:@selector(sliderChanged:) forControlEvents:UIControlEventValueChanged];
    mySlider.maximumValue = audioPlayer.duration;

}
else{

    [audioPlayer pause];
    [sliderTimer invalidate];
}



playPause.selected = !playPause.selected;

}

    我有播放和暂停的常用按钮，它只是分别将 normal state 和 selected state 的 Headers 更改为 play 和 pause .

    所以在我的方法中， playPause 是按钮， audioPlayer 是 AVAudioPlayer 对象， sliderTimer 是 NSTimer 对象， mySlider 是 UISlider 对象来显示进度 . 而已 . 您可以像我提到的那样管理您的案例 .

    并且 updateSlider 和 sliderChanged 方法如下所示，

    - (void)updateSlider{

mySlider.value = audioPlayer.currentTime;
timerLabel.text = [self timeFormatted:audioPlayer.duration - audioPlayer.currentTime];
NSLog(@"update slider call");

}

- (void)sliderChanged : (UISlider*) sender{


[audioPlayer setCurrentTime:mySlider.value];
timerLabel.text = [self timeFormatted:audioPlayer.duration - mySlider.value];


}

    因此，如果用户手动更改 UISlider ，则会调用 sliderChanged ，您的播放器将在此时到达 .

    回复于
  • 2

    我知道了！

    我只是在暂停功能中添加以下内容

    rate = CMTimeGetSeconds([_player currentTime])/60;

    并将其设置为音频播放器的当前时间，并参考了凯尔默的答案

    [audioPlayer setCurrentTime:rate];

    当停止时

    rate = 0.0;

    和rate是一个全局声明的浮点数 . 感谢Ketan ..！

    回复于

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