He creado una aplicación con tab bar,nav bar and table view
.Reproducción de audio con controles en iOS
En la vista de tabla puede elegir escuchar algo de audio.
Se abre una nueva vista y allí tengo algunos controles como: reproducir, pausar, deslizador de volumen, control deslizante de progreso, etiqueta con la hora actual.
Funciona, pero no es perfecto. Puedo reproducir el audio, puedo pausar el audio, también puedo usar el control deslizante para saltar hacia adelante o hacia atrás. Pero ahora:
Cuando presiono el botón Atrás en la barra de navegación, la canción sigue sonando. Está bien, pero cuando vuelvo a la vista, el temporizador y el deslizador se reinician. No puedo pausar la canción, solo necesito esperar a que deje de reproducirse.
Además, cuando golpeo juego, volver a la vista de tabla, elija otro archivo para jugar, la primera archivo no se detendrá.
Este es el código Audio1DetailViewController.h:
#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
Este es el código Audio1DetailViewController.m:
#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
Aquí está el 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
Y el 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
, también [Ver Manzana Doc.] (Http://developer.apple.com/library/ios/#documentation/mediaplayer/reference/MPMusicPlayerController_ClassReference/Reference/Reference.html) – HDdeveloper