Lecture de fichiers audio avec les contrôles de iOS

J'ai fait une application avec tab bar,nav bar and table view.

Dans le tableau d'affichage vous pouvez choisir d'écouter de l'audio.

Nouvelle vue s'ouvre et là, j'ai quelques commandes comme: lecture,pause,volume curseur, curseur de progression, étiquette, à l'heure actuelle.

Il fonctionne, mais n'est pas parfait.
Je peux jouer de l'audio, je peux mettre en pause l'audio, je peux également utiliser le curseur pour sauter en avant ou en arrière. Mais maintenant:

, Quand j'appuie sur le bouton précédent de la barre de navigation, la chanson continue à jouer. C'est ok, mais lorsque je retourne à la vue encore une fois, la minuterie et le curseur de revenir d'elles-mêmes. Je ne peux pas mettre en pause la chanson, faut juste attendre util il s'arrête de jouer.

Aussi, quand j'appuie sur play, revenez à la vue de la table, choisir un autre fichier pour le lire, le premier fichier ne sera pas arrêter de jouer.

Ici est la Audio1DetailViewController.h 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

Ici est la Audio1DetailViewController.m 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

Ici est la AudioTableViewController.h

     #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

Et la AudioTableViewController.m

    #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

OriginalL'auteur iHilas | 2011-11-23