あなたはまずそのようAVAudioPlayer
のAVPlayerItem
を守るべきです。
[playerItem addObserver:self forKeyPath:@"timedMetadata" options:NSKeyValueObservingOptionNew context:nil];
はその後、いくつかのグローバル変数を作成します。あなたが観察して
NSString *title;
NSString *artist;
UIImage *artwork;
あなたは、おそらく、以下のような機能が必要になりますキー・パスtimedMetadata
を入力し、updateInfoCenterWithTitle:andArtist:andCover:
を介して情報センターを更新してください。
- (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);
}
}
}
}
魔法が起こる場所です:
- (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]}];
}