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POPlaying audio with controls in iOS
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copied!<p>I've made an app with <code>tab bar,nav bar and table view</code>. </p> <p>In the table view you can choose to listen to some audio.</p> <p>New view opens and there I have some controls like: play,pause,volume slider, progress slider, label with the current time. </p> <p>It works, but not perfect. I can play the audio, I can pause the audio, I can also use the slider to skip forward or back. But now:</p> <p><strong>When I hit the Back button on the navbar, the song keeps playing. That's ok, but when I go back to the view again, the timer and the slider reset themselves. I can't pause the song, just need to wait util it stops playing.</strong></p> <p>Also, when I hit play, go back to the table view, choose another file to play, the first <strong>file won't stop playing</strong>.</p> <p>Here is the Audio1DetailViewController.h code:</p> <pre><code> #import <UIKit/UIKit.h> #import <AVFoundation/AVFoundation.h> @interface Audio1DetailViewController: UIViewController <AVAudioPlayerDelegate> { IBOutlet UISlider *volumeControl; IBOutlet UILabel *timerLabel; IBOutlet UISlider *progressBar; AVAudioPlayer *audioPlayer; NSTimer *playbackTimer; } @property (nonatomic, retain) IBOutlet UISlider *volumeControl; @property (nonatomic, retain) IBOutlet UILabel *timerLabel; @property (nonatomic, retain) IBOutlet UISlider *progressBar; @property (nonatomic, retain) NSTimer *playbackTimer; @property (nonatomic, retain) AVAudioPlayer *audioPlayer; -(IBAction) playAudio; -(IBAction) stopAudio; -(IBAction) adjustVolume; -(IBAction) sliderChanged; @end </code></pre> <p>Here is the Audio1DetailViewController.m code:</p> <pre><code> #import "Audio1DetailViewController.h" @implementation Audio1DetailViewController @synthesize volumeControl, timerLabel, playbackTimer, progressBar, audioPlayer; -(void)playAudio { playbackTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(updateTime) userInfo:nil repeats:YES]; [audioPlayer play]; } -(void)stopAudio { [playbackTimer invalidate]; [audioPlayer stop]; } -(void)adjustVolume { if (audioPlayer != nil) { audioPlayer.volume = volumeControl.value; } } -(void)updateTime { float minutes = floor(audioPlayer.currentTime/60); float seconds = audioPlayer.currentTime - (minutes * 60); float duration_minutes = floor(audioPlayer.duration/60); float duration_seconds = audioPlayer.duration - (duration_minutes * 60); NSString *timeInfoString = [[NSString alloc] initWithFormat:@"%0.0f.%0.0f / %0.0f.%0.0f", minutes, seconds, duration_minutes, duration_seconds]; timerLabel.text = timeInfoString; [timeInfoString release]; } - (void)viewDidLoad { [super viewDidLoad]; NSURL *url = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"001Fatiha" ofType:@"MP3"]]; NSError *error; audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error]; [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil]; [[AVAudioSession sharedInstance] setActive: YES error: nil]; if (error) { NSLog(@"Error in audioPlayer: %@", [error localizedDescription]); } else { audioPlayer.delegate = self; [audioPlayer prepareToPlay]; } playbackTimer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(updateSlider) userInfo:nil repeats:YES]; progressBar.maximumValue = audioPlayer.duration; // Set the valueChanged target [progressBar addTarget:self action:@selector(sliderChanged:) forControlEvents: UIControl EventValueChanged]; } - (void)updateSlider { // Update the slider about the music time progressBar.value = audioPlayer.currentTime; } - (IBAction)sliderChanged:(UISlider *)sender { // Fast skip the music when user scroll the UISlider [audioPlayer stop]; [audioPlayer setCurrentTime:progressBar.value]; [audioPlayer prepareToPlay]; [audioPlayer play]; } -(void)audioPlayerDidFinishPlaying: (AVAudioPlayer *)player successfully:(BOOL)flag { } -(void)audioPlayerDecodeErrorDidOccur: (AVAudioPlayer *)player error:(NSError *)error { } -(void)audioPlayerBeginInterruption:(AVAudioPlayer *)player { } -(void)audioPlayerEndInterruption:(AVAudioPlayer *)player { } -(void)viewDidUnload { audioPlayer = nil; volumeControl = nil; } -(void)dealloc { [audioPlayer release]; [volumeControl release]; [playbackTimer release]; [super dealloc]; } @end </code></pre> <p>Here is the AudioTableViewController.h</p> <pre><code> #import <UIKit/UIKit.h> @class Audio1DetailViewController; @interface AudioTableViewController : UITableViewController <UITableViewDelegate,UITableViewDataSource>{ IBOutlet UITableView *audioTableView; NSMutableArray *audioArray; Audio1DetailViewController *audio1DetailViewController; } @property (nonatomic, retain) NSMutableArray *audioArray; @property (nonatomic, retain) Audio1DetailViewController *audio1DetailViewController; @end </code></pre> <p>And the AudioTableViewController.m</p> <pre><code> #import "AudioTableViewController.h" #import "Audio1DetailViewController.h" #import "DEQAppDelegate.h" @implementation AudioTableViewController @synthesize audioArray; @synthesize audio1DetailViewController; - (id)initWithStyle:(UITableViewStyle)style { self = [super initWithStyle:style]; if (self) { // Custom initialization { return self; } - (void)didReceiveMemoryWarning { // Releases the view if it doesn't have a superview. [super didReceiveMemoryWarning]; // Release any cached data, images, etc that aren't in use. } #pragma mark - View lifecycle - (void)viewDidLoad{ [super viewDidLoad]; self.title = NSLocalizedString(@"Audio", @"Audio"); self.audioArray = [[NSArray alloc] initWithObjects: @"1. Het Begin", @"2. De Mensen", //etcetera nil]; // Uncomment the following line to preserve selection between presentations. self.clearsSelectionOnViewWillAppear = NO; // Uncomment the following line to display an Edit button in the navigation bar for this view controller. // self.navigationItem.rightBarButtonItem = self.editButtonItem; } - (void)viewDidUnload { [super viewDidUnload]; // Release any retained subviews of the main view. self.audioArray = 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 == UIInterfaceOrientationPortrait); } #pragma mark - Table view data source - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { #warning Potentially incomplete method implementation. // Return the number of sections. return 1; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { #warning Incomplete method implementation. // Return the number of rows in the section. return [self.audioArray count]; } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath: (NSIndexPath *)indexPath { static NSString *CellIdentifier = @"Cell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithStyle: UITableViewCellStyleDefaultreuseIdentifier:CellIdentifier] autorelease]; } // Configure the cell... cell.textLabel.text = [self.audioArray objectAtIndex:[indexPath row]]; return cell; } #pragma mark - Table view delegate - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { // Navigation logic may go here. Create and push another view controller. NSUInteger row = indexPath.row; if (row == 0) { Audio1DetailViewController *audio1DetailViewController =[[Audio1DetailViewController alloc] initWithNibName:@"Audio1DetailViewController" bundle:nil]; audio1DetailViewController.title = @"Audio"; [self.navigationController pushViewController:audio1DetailViewController animated:YES]; [audio1DetailViewController release]; } if (row == 1) { //etcetera } } - (void)dealloc{ [audioArray release]; [super dealloc]; } @end </code></pre>

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