AVAudioPlayer播放音乐文件及读取ipod库中的音乐文件

下面是ipad上的调试效果



下面是代码，代码中都有注释：

#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>
#import <MediaPlayer/MediaPlayer.h>

@interface RootViewController : UIViewController <AVAudioPlayerDelegate>
{
AVAudioPlayer *player;
}

@property (nonatomic, retain) AVAudioPlayer *player;
@property (nonatomic, retain) UISlider *slider;
@property (nonatomic, retain) NSTimer *timer;

@end

//
// RootViewController.h
// SoundDemo
//
// Created by on 13-6-21.
// Copyright (c) 2013年 DoubleMan. All rights reserved.
//

#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>
#import <MediaPlayer/MediaPlayer.h>

@interface RootViewController : UIViewController <AVAudioPlayerDelegate>
{
AVAudioPlayer *player;
}

@property (nonatomic, retain) AVAudioPlayer *player;
@property (nonatomic, retain) UISlider *slider;
@property (nonatomic, retain) NSTimer *timer;

@end

[cpp]
//
// RootViewController.m
// SoundDemo
//
// Created by on 13-6-21.
// Copyright (c) 2013年 DoubleMan. All rights reserved.
//

#import "RootViewController.h"

@interface RootViewController ()

@end

@implementation RootViewController

@synthesize player;
@synthesize slider;
@synthesize timer;

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization

}
return self;
}

- (void)viewDidLoad
{
[super viewDidLoad];

UIButton *musicPlay = [UIButton buttonWithType:UIButtonTypeRoundedRect];
musicPlay.frame = CGRectMake(10, 10, 90, 35);
[musicPlay setTitle:@"Play" forState:UIControlStateNormal];
[musicPlay addTarget:self action:@selector(playMusic) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:musicPlay];

UIButton *pause = [UIButton buttonWithType:UIButtonTypeRoundedRect];
pause.frame = CGRectMake(115, 10, 90, 35);
[pause setTitle:@"Pause" forState:UIControlStateNormal];
[pause addTarget:self action:@selector(pause) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:pause];

UIButton *stop = [UIButton buttonWithType:UIButtonTypeRoundedRect];
stop.frame = CGRectMake(220, 10, 90, 35);
[stop setTitle:@"stop" forState:UIControlStateNormal];
[stop addTarget:self action:@selector(stop) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:stop];

slider = [[UISlider alloc] initWithFrame:CGRectMake(10, 65, 300, 20)];
[slider addTarget:self action:@selector(sliderValueChange:) forControlEvents:UIControlEventValueChanged];
[self.view addSubview:slider];

//
NSString *path = [[NSBundle mainBundle] pathForResource:@"找一个相爱的理由-晨熙-艾歌" ofType:@"wav"];
NSURL *url = [NSURL fileURLWithPath:path];
player = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];
// 设置循环次数，-1为一直循环
player.numberOfLoops = -1;
// 准备播放
[player prepareToPlay];
// 设置播放音量
player.volume = 50;
// 当前播放位置，即从currentTime处开始播放，相关于android里面的seekTo方法
player.currentTime = 15;
// 设置代理
player.delegate = self;
int dur = player.duration;
slider.maximumValue = dur;

// 一秒一次更新播放进度
timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(updateSlider) userInfo:nil repeats:YES];

// 从ipod库中读出音乐文件
// MPMediaQuery *everything = [[MPMediaQuery alloc] init];
// // 读取条件
// MPMediaPropertyPredicate *albumNamePredicate =
// [MPMediaPropertyPredicate predicateWithValue:[NSNumber numberWithInt:MPMediaTypeMusic ] forProperty: MPMediaItemPropertyMediaType];
// [everything addFilterPredicate:albumNamePredicate];
//
// NSLog(@"Logging items from a generic query...");
// NSArray *itemsFromGenericQuery = [everything items];
// for (MPMediaItem *song in itemsFromGenericQuery) {
// NSString *songTitle = [song valueForProperty: MPMediaItemPropertyTitle];
// NSLog (@"%@", songTitle);
// }
//
// [everything release];
}

// 更新播放进度
- (void)updateSlider {
slider.value = player.currentTime;
}

// 进度滑块变化时，跳转到进度播放
- (void)sliderValueChange:(UISlider *)mSlider {
player.currentTime = mSlider.value;
NSLog(@"value: %.0f", mSlider.value);
}

// 停止
- (void)stop {
player.currentTime = 0;
[player stop];
}

// 暂停
- (void)pause {
[player pause];
NSLog(@"pause");
}

// 开始播放
- (void)playMusic {
NSLog(@"start play");
[player play];
}

#pragma mark - AVAudioPlayerDelegate
- (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag {
// 播放完成时调用 只有当播放结束时才会调用，循环播放时不会调
[timer invalidate];
NSLog(@"audioPlayerDidFinishPlaying");
}

/* if an error occurs while decoding it will be reported to the delegate. */
- (void)audioPlayerDecodeErrorDidOccur:(AVAudioPlayer *)player error:(NSError *)error {
// 解码出错时调用
}

- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

- (void)dealloc
{
[player stop];
[player release];
[slider release];
[timer release];
[super dealloc];
}

@end