播放音乐

播放音乐

1.
2.#import "ViewController.h"
3.#import <AVFoundation/AVFoundation.h>
4.
5.@interface ViewController () <AVAudioPlayerDelegate> {
6.    AVAudioPlayer *myAudioPlayer;
7.}
8.@property (weak, nonatomic) IBOutlet UILabel *artistLabel;
9.@property (weak, nonatomic) IBOutlet UILabel *albumLabel;
10.@property (weak, nonatomic) IBOutlet UIImageView *artworkImageView;
11.
12.@end
13.
14.@implementation ViewController
15.
16.- (void)viewDidLoad {
17.    [super viewDidLoad];
18.
19.    // 获得音频会话的单例对象
20.    AVAudioSession *audioSession = [AVAudioSession sharedInstance];
21.    // 激活音频会话
22.    [audioSession setActive:YES error:nil];
23.    // 设置支持后台播放
24.    [audioSession setCategory:AVAudioSessionCategoryPlayback error:nil];
25.    // 设置应用程序可以接受远程控制事件
26.    [[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
27.
28.    NSString *filePath = [[NSBundle mainBundle] pathForResource:@"后会无期" ofType:@"mp3"];
29.    NSURL *fileUrl = [NSURL fileURLWithPath:filePath];
30.
31.
32.    // 创建一个AVURLAsset对象，该对象保存了音频文件的元数据
33.    AVURLAsset *asset = [[AVURLAsset alloc] initWithURL:fileUrl options:nil];
34.    // 获得元数据格式
35.    NSString *format = [[asset availableMetadataFormats] firstObject];
36.
37.    // 根据指定的格式获得元数据
38.    // 对获得的元数据做一个循环取到其中的每一项
39.    for (AVMetadataItem *item in [asset metadataForFormat:format]) {
40.        if ([item.commonKey isEqualToString:@"artist"]) { // 艺术家
41.            self.artistLabel.text = (id)item.value;
42.        }
43.        else if ([item.commonKey isEqualToString:@"albumName"]) {   // 专辑
44.            self.albumLabel.text = (id)item.value;
45.        }
46.        else if ([item.commonKey isEqualToString:@"artwork"]) { // 封面
47.            // 如果是封面的话item.value是封面图片的二进制数据
48.            // 需要转换成UIImage对象
49.            NSData *data = (id)item.value;
50.            self.artworkImageView.image = [UIImage imageWithData:data];
51.        }
52.        else if ([item.commonKey isEqualToString:@"title"]) {   // 歌名
53.
54.        }
55.    }
56.
57.    myAudioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:fileUrl error:nil];
58.    // 音量(0-1) 1以后软放大
59.    myAudioPlayer.volume = 1;
60.    // 缓冲
61.    [myAudioPlayer prepareToPlay];
62.    // 开始播放
63.    [myAudioPlayer play];
64.    // 暂停播放
65.    // [myAudioPlayer pause];
66.
67.    myAudioPlayer.delegate = self;
68.
69.//    myAudioPlayer.enableRate = YES;
70.//    myAudioPlayer.rate = 8;
71.}
72.
73.- (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag {
74.    // 当播放完成时要回调的方法(可以在此处添加代码实现播放下一首)
75.
76.}
77.
78.@end
79.
80.