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具体内容如下
//1、调整音频会话设置，确保应用进入后台或静音开关已开启时音频仍将继续播放//2、锁屏状态下显示媒体信息//3、锁屏上的空间可以控制音频播放#import "ViewController.h"#import#import @interface ViewController ()@property (nonatomic, strong) AVAudioPlayer *audioPlayer;@property (weak, nonatomic) UIButton *playButton;@end@implementation ViewController- (void)viewDidLoad { [super viewDidLoad]; UIButton * playButton = [UIButton buttonWithType:UIButtonTypeSystem]; playButton.frame = CGRectMake(0, 0, 200, 40); playButton.center = self.view.center; [playButton setTitle:@"在后台播放音频" forState:UIControlStateNormal]; [playButton addTarget:self action:@selector(playMusicInBackground:) forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:playButton]; NSError *playerInitError = nil; NSString *audioPath = [[NSBundle mainBundle] pathForResource:@"background_audio" ofType:@"mp3"]; NSURL *audioURL = [NSURL fileURLWithPath:audioPath]; self.audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:audioURL error:&playerInitError]; AVAudioSession *session = [AVAudioSession sharedInstance]; NSError *activeError = nil; if (![session setActive:YES error:&activeError]) { NSLog(@"Failed to set active audio session!"); } //No.1 //开始写代码，调整音频会话设置，确保即便应用进入后台或静音开关已开启，音频仍将继续播放 NSError *categoryError = nil; [session setCategory:AVAudioSessionCategoryPlayback error:&categoryError]; //end_code}- (void)playMusicInBackground:(id)sender { if ([self.audioPlayer isPlaying]) { [self.audioPlayer stop]; [self.playButton setTitle:@"正在播放音乐" forState:UIControlStateNormal]; } else { UIImage *lockImage = [UIImage imageNamed:@"belongToMe.jpg"]; MPMediaItemArtwork *artwork = [[MPMediaItemArtwork alloc] initWithImage:lockImage]; NSDictionary *mediaDict = @{ MPMediaItemPropertyTitle: @"BackgroundTask Audio", MPMediaItemPropertyMediaType: @(MPMediaTypeAnyAudio), MPMediaItemPropertyPlaybackDuration: @(self.audioPlayer.duration), MPNowPlayingInfoPropertyPlaybackRate: @1.0, MPNowPlayingInfoPropertyElapsedPlaybackTime: @(self.audioPlayer.currentTime), MPMediaItemPropertyAlbumArtist: @"Some User", MPMediaItemPropertyArtist: @"Some User", MPMediaItemPropertyArtwork: artwork }; [self.audioPlayer play]; [self.playButton setTitle:@"停止播放后台音乐" forState:UIControlStateNormal]; //No.2 //开始写代码，将媒体信息显示在锁定屏幕上，并使锁屏上控件可以控制音频播放 [[UIApplication sharedApplication] beginReceivingRemoteControlEvents]; //end_code }}//No.3//开始写代码，响应远程控制，使得进入锁屏状态后可以控制音乐“播放”和“暂停”- (void) remoteControlReceivedWithEvent: (UIEvent *) receivedEvent { if (receivedEvent.type == UIEventTypeRemoteControl) { switch (receivedEvent.subtype) { case UIEventSubtypeRemoteControlPlay: [self.audioPlayer play]; break; case UIEventSubtypeRemoteControlPause: [self.audioPlayer pause]; break; default: NSLog(@"没有处理过这个事件------receivedEvent.subtype==%ld",(long)receivedEvent.subtype); break; } }}//end_code- (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning];}@end
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