먼저과 같이 AVAudioPlayer
의 AVPlayerItem
을 준수해야합니다
[playerItem addObserver:self forKeyPath:@"timedMetadata" options:NSKeyValueObservingOptionNew context:nil];
그런 다음 몇 가지 글로벌 변수를 만들 : 당신은 관찰 할 수 있도록
NSString *title;
NSString *artist;
UIImage *artwork;
그러면 아마, 아래와 같은 기능을 필요 키 경로 timedMetadata
및 updateInfoCenterWithTitle:andArtist:andCover:
을 통해 정보 센터를 갱신하십시오. 마법이 일어나는 곳
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
{
if ([keyPath isEqualToString:@"timedMetadata"])
{
for (int i = 0; i < [audioPlayer.currentItem.timedMetadata count]; i++)
{
AVMetadataItem *metaData = [audioPlayer.currentItem.timedMetadata objectAtIndex:i];
if ([[metaData commonKey] isEqualToString:AVMetadataCommonKeyArtist]) {
artist = (NSString *)metaData.value;
}
else if ([[metaData commonKey] isEqualToString:AVMetadataCommonKeyTitle])
{
title = (NSString *)metaData.value;
[self updateInfoCenterWithTitle:title andArtist:artist andCover:artwork];
}
else if ([[metaData commonKey] isEqualToString:AVMetadataCommonKeyArtwork])
{
if ([metaData.keySpace isEqualToString:AVMetadataKeySpaceID3])
{
NSDictionary *dictionary = [metaData.value copyWithZone:nil];
artwork = [UIImage imageWithData:[dictionary objectForKey:@"data"]]];
} else if ([metaData.keySpace isEqualToString:AVMetadataKeySpaceiTunes]) {
artwork = [UIImage imageWithData:[metaData.value copyWithZone:nil]];
}
}
else {
NSLog(@"%@ --> %@", [metaData commonKey], metaData.value);
}
}
}
}
입니다 :
- (void)updateInfoCenterWithTitle:(NSString *)title andArtist:(NSString *)artist andCover:(UIImage *)cover
{
if (cover == nil) {
cover = [UIImage imageNamed:@"defaultCover"];
}
MPNowPlayingInfoCenter *infoCenter = [MPNowPlayingInfoCenter defaultCenter];
[infoCenter setNowPlayingInfo:@{MPMediaItemPropertyTitle:title,
MPMediaItemPropertyArtist:artist,
MPMediaItemPropertyArtwork:[[MPMediaItemArtwork alloc] initWithImage:cover]}];
}