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POUISlider not updating
 

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    <p>I am trying to code a music player for an assignment and I am stuck with trying to get the slider to update as the song is playing. I have been able to make it so that if the user were to slide the slider the song will rewind/fast-forward to that part of the song. Does anyone know why the slider doesn't continuously update as the song is playing?</p> <p>Here is the .h file</p> <pre><code>#import &lt;UIKit/UIKit.h&gt; #import &lt;AVFoundation/AVFoundation.h&gt; #import &lt;MediaPlayer/MediaPlayer.h&gt; @interface AS3MPViewController : UIViewController &lt;MPMediaPickerControllerDelegate&gt;{ IBOutlet UIButton *playButton; IBOutlet UIButton *stopButton; IBOutlet UIButton *pauseButton; IBOutlet UISlider *volumeSlider; AVAudioPlayer *musicPlayer; IBOutlet UIButton *pickSongButton; IBOutlet UISlider *timeSlider; NSTimer *timer; } @property (nonatomic, retain) UIButton *playButton; @property (nonatomic, retain) UIButton *stopButton; @property (nonatomic, retain) UIButton *pauseButton; @property (nonatomic, retain) UISlider *volumeSlider; @property (nonatomic, retain) AVAudioPlayer *musicPlayer; @property (nonatomic, retain) UIButton *pickSongButton; @property (nonatomic, retain) UISlider *timeSlider; @property (nonatomic, retain) NSTimer *timer; - (IBAction) play; - (IBAction) stop; - (IBAction) pause; - (IBAction) changeVolume: (UISlider *)sender; - (IBAction) chooseSong: (UIButton *)sender; - (IBAction) changeTime: (UISlider *)sender; - (void)setTimeSliderOptions; @end </code></pre> <p>Here is the .m file</p> <pre><code>#import "AS3MPViewController.h" @interface AS3MPViewController () @end @implementation AS3MPViewController @synthesize playButton = _playButton; @synthesize stopButton = _stopButton; @synthesize pauseButton = _pauseButton; @synthesize musicPlayer = _musicPlayer; @synthesize volumeSlider = _volumeSlider; @synthesize pickSongButton = _pickSongButton; @synthesize timeSlider = _timeSlider; @synthesize timer; - (void)viewDidLoad { [super viewDidLoad]; NSString *filePath = [[NSBundle mainBundle] pathForResource:@"animals001" ofType:@"mp3"]; NSURL *fileURL = [[NSURL alloc] initFileURLWithPath:filePath]; self.musicPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:fileURL error:nil]; [self.musicPlayer prepareToPlay]; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } - (IBAction) play { [self.musicPlayer play]; } - (IBAction) stop { [self.musicPlayer stop]; self.musicPlayer.currentTime = 0; } - (IBAction) pause { [self.musicPlayer pause]; } - (IBAction) changeVolume: (UISlider *)sender { self.musicPlayer.volume = [sender value]; } - (IBAction)chooseSong:(UIButton *)sender { MPMediaPickerController *mediaPicker = [[MPMediaPickerController alloc] initWithMediaTypes:MPMediaTypeAnyAudio]; [mediaPicker setDelegate:self]; [mediaPicker setAllowsPickingMultipleItems:NO]; mediaPicker.prompt = NSLocalizedString(@"Add Some Songs To Play", "Prompt In Media Item Picker"); [self presentModalViewController: mediaPicker animated:YES]; } - (void) mediaPickerDidCancel:(MPMediaPickerController *)mediaPicker { [self dismissModalViewControllerAnimated:YES]; } - (void) mediaPicker:(MPMediaPickerController *)mediaPicker didPickMediaItems: (MPMediaItemCollection *)mediaItemCollection { MPMediaItem *item = [[mediaItemCollection items] objectAtIndex:0]; NSURL *url = [item valueForProperty:MPMediaItemPropertyAssetURL]; //AVPlayerItem *playerItem = [[AVPlayerItem alloc] initWithURL:url]; //AVPlayer *player = [[AVPlayer alloc] initWithPlayerItem:playerItem]; self.timeSlider.maximumValue = [self.musicPlayer duration]; self.musicPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil]; [self.musicPlayer play]; timer = [NSTimer scheduledTimerWithTimeInterval:0.1f target:self selector:@selector(songCurrentTime) userInfo:nil repeats:YES]; [self dismissModalViewControllerAnimated:YES]; } - (IBAction)changeTime: (UISlider *)sender { self.musicPlayer.currentTime = self.musicPlayer.duration * sender.value; } - (void)songCurrentTime { timeSlider.value = (self.musicPlayer.currentTime / self.musicPlayer.duration); } @end </code></pre>
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