Objective-C中的音樂播放大多用AVAudioPlayer，它有很多優點：
（1）可以播放任意長度音樂；
（2）可以迴圈播放；
（3）可以控制播放的時間；
（4）可以控制聲道的音量實現立體聲效果；
（5）可以調整音量。
但是AVAudioPlayer有一個很大的缺點，那就是隻能用於播放本地音訊，網路資源播放之前必須先載入，不能立即播放；但系統為我們提供了另一個更為豐富的類MPMoviePlayerController和AVPlayer來播放流媒體，MPMoviePlayerController使用更簡單，但功能不如AVPlayer強大。這裡介紹一下AVPlayer播放線上音訊，播放視訊以後再介紹。直接上程式碼，註釋會盡量寫的詳細一些：
新建一個類繼承自NSObject：AudioPlayer
.h檔案程式碼：

#import <Foundation/Foundation.h>
@class AudioPlayer;

@protocol AudioPlayerDelegate <NSObject>

//再播放中每秒都執行的事件
- (void)audioplayerPlayWith:(AudioPlayer *)audioplayer Progress:(float)progress;

//當一首歌曲播放完成之後執行這個事件
- (void)audioplayerDidFinishItem:(AudioPlayer *)audioplayer;

@end


@interface
 
 AudioPlayer : NSObject


@property(nonatomic,assign)id<AudioPlayerDelegate>delegate;
@property(nonatomic,assign)BOOL isPlaying;
+(AudioPlayer*)sharePlayer;
-(void)play;
-(void)pause;
-(void)seekToTime:(float)time;
-(void)setPrepareMusicUrl:(NSString*)urlStr;
@end

.m檔案程式碼：

#import "AudioPlayer.h"
 

@import AVFoundation;
@interface AudioPlayer ()
{
    BOOL _isPrepare;//播放是否準備成功
    BOOL _isPlaying;//播放器是否正在播放
}

@property(nonatomic,strong)AVPlayer *player;
@property(nonatomic,strong)NSTimer *timer;

@end
@implementation AudioPlayer

+(AudioPlayer*)sharePlayer
{

    static AudioPlayer *player = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        player = [AudioPlayer new];
    });
    return  player;
}
- (instancetype)init
{
    self = [super init];
    if (self) {
        //通知中心
        [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(endAction:) name:AVPlayerItemDidPlayToEndTimeNotification object:nil];
    }
    return self;
}

-(void)setPrepareMusicUrl:(NSString*)urlStr
{

    if (self.player.currentItem) {
        [self.player.currentItem removeObserver:self forKeyPath:@"status"];
    }

//建立一個item資源
    AVPlayerItem *item = [AVPlayerItem playerItemWithURL:[NSURL URLWithString:urlStr]];
    [item addObserver:self forKeyPath:@"status" options:(NSKeyValueObservingOptionNew|NSKeyValueObservingOptionOld) context:nil];
    [self.player replaceCurrentItemWithPlayerItem:item];
}

-(void)play
{
//判斷資源是否準備成功
    if (!_isPrepare) {
        return;
    }
    [self.player play];
    _isPlaying = YES;
    //播放時候的圖片轉動效果
    //timer初始化
    if (_timer) {
        return;
    }

    //建立一個timer
    self.timer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(playingAction:) userInfo:nil repeats:YES];


}
-(void)pause
{
    if (!_isPlaying) {
        return;
    }

    [self.player pause];
    _isPlaying = NO;
    //銷燬計時器
    [_timer invalidate];
    _timer = nil;

}

-(void)seekToTime:(float)time
{

//當音樂播放器時間改變時,先暫停後播放
    [self pause];
    [self.player seekToTime:CMTimeMakeWithSeconds(time, self.player.currentTime.timescale) completionHandler:^(BOOL finished) {
        if (finished) {
            [self play];
        }
    }];

}
//每隔0.1秒執行一下這個事件
-(void)playingAction:(id)sender
{


    if (self.delegate&&[self.delegate respondsToSelector:@selector(audioplayerPlayWith:Progress:)]) {

        //獲取當前播放歌曲的時間
        float progress = 1.0 * self.player.currentTime.value / self.player.currentTime.timescale;
        [self.delegate audioplayerPlayWith:self Progress:progress];


    }

}
-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
{

    AVPlayerStatus staute = [change[@"new"] integerValue];
    switch (staute) {
        case AVPlayerStatusReadyToPlay:
            NSLog(@"載入成功,可以播放了");
            _isPrepare = YES;
            [self play];
            break;
            case AVPlayerStatusFailed:
            NSLog(@"載入失敗");
            break;
            case AVPlayerStatusUnknown:
            NSLog(@"資源找不到");
            break;


        default:
            break;
    }

    NSLog(@"change:%@",change);
}
//當一首歌播放結束時會執行下面的方法
-(void)endAction:(NSNotification *)not
{

    if (self.delegate &&[self.delegate respondsToSelector:@selector(audioplayerDidFinishItem:)]) {
        [self.delegate audioplayerDidFinishItem:self];
    }

}

-(AVPlayer*)player
{
    if (_player==nil) {
        _player = [AVPlayer new];
    }
    return _player;
}

-(BOOL)isPlaying{
    return _isPlaying;
}
@end

使用方法很簡單，傳正確的url初始化然後呼叫對應的方法，我就不玩滾這裡貼上了。此外推薦一個第三方庫AFSoundManager, 簡化了 iOS 音訊播放功能，支援本地檔案和流媒體，通過一個完全 Block 驅動的 Objective-C 類實現。使用 AudioToolbox 和 AVFoundation 框架。我在Demo中也對其進行了封裝。用法和我們剛剛封裝的AudioPlayer類似。感興趣的可以看看。
demo：

GitHub：https://github.com/FEverStar/AudioDemo