ios 音频后台播放

首先配置info中


在需要后台播放的控制器中添加如下代码
//后台播放
AVAudioSession *session = [AVAudioSession sharedInstance];
[session setCategory:AVAudioSessionCategoryPlayback error:nil];
[session setActive:YES error:nil];
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];

- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];

[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
[self becomeFirstResponder];
}
- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];

[[UIApplication sharedApplication] endReceivingRemoteControlEvents];
[self resignFirstResponder];
}
//

锁屏封面

一般在每次切换歌曲或者更新信息的时候要调用这个方法
- (void)configNowPlayingInfoCenter {
isSame = YES;
entity = [musicArray objectAtIndex:musicArrayNumber];
if ( entity == nil) {
return;
}

@autoreleasepool {

NSDictionary *info = self.nowPlayingMusicInfo;

NSMutableDictionary *dict = [[NSMutableDictionary alloc] init];

//歌曲名称
[dict setObject:entity.title forKey:MPMediaItemPropertyTitle];

//演唱者
[dict setObject:[info ObjectNullForKey:@"author"] forKey:MPMediaItemPropertyArtist];

//专辑名
[dict setObject:[info ObjectNullForKey:@"album"] forKey:MPMediaItemPropertyAlbumTitle];

//专辑缩略图
NSString *localImagePath = [CommonService addLocalRootPath:entity.album1 ParkId:parkEntity.ID];

NSData * thumbData = [NSData dataWithContentsOfFile:localImagePath];

if (thumbData != nil) {
UIImage *image = [UIImage imageWithData:thumbData];
MPMediaItemArtwork *artwork = [[MPMediaItemArtwork alloc] initWithImage:image];
[dict setObject:artwork forKey:MPMediaItemPropertyArtwork];
}else
{
// FIXME: 无图的时候，读取图

}
//音乐剩余时长
[dict setObject:[NSNumber numberWithDouble:finalTime] forKey:MPMediaItemPropertyPlaybackDuration];

// 音乐当前播放时间 在计时器中修改
[dict setObject:[NSNumber numberWithDouble:0.0] forKey:MPNowPlayingInfoPropertyElapsedPlaybackTime];

//设置锁屏状态下屏幕显示播放音乐信息
//DLog(@"显示播放音乐信息：%@\n%@",dict,[info ObjectNullForKey:@"title"]);

[[MPNowPlayingInfoCenter defaultCenter] setNowPlayingInfo:dict];

}

}
- (BOOL)canBecomeFirstResponder
{
return YES;
}

-(void) remoteControlReceivedWithEvent: (UIEvent *) receivedEvent {
if (receivedEvent.type == UIEventTypeRemoteControl) {

switch (receivedEvent.subtype) {
case UIEventSubtypeRemoteControlPlay:
[self playMusic];
break;
case UIEventSubtypeRemoteControlPause:
[self pauseMusic];
break;

case UIEventSubtypeRemoteControlPreviousTrack:
[self aboveMusic:_aboveBtn];
break;

case UIEventSubtypeRemoteControlNextTrack:
[self nextMusic:_nextBtn];
break;

default:
break;
}
}
}