iOS - MPMediaItem 显示默认图稿

发布于 2024-12-11 05:59:02 字数 625 浏览 1 评论 0原文

我目前正在开发一个应用程序，可以显示您正在音乐播放器中收听的艺术家、曲目和专辑封面。一切都很顺利，除了当我播放一首没有艺术作品的歌曲时，我希望能够显示我自己的默认图像（而不是显示空白屏幕）。

下面是我想象它应该如何工作，但它永远不会进入其他，因为 itemArtwork 永远不会为零！

感谢您的帮助。

谢谢，本

_item = [_player nowPlayingItem];
MPMediaItemArtwork *itemArtwork = [_item valueForProperty:MPMediaItemPropertyArtwork];

if (itemArtwork != nil) {
    UIImage *albumArtworkImage = [itemArtwork imageWithSize:CGSizeMake(250.0, 250.0)];
    _albumArtImageView.image = albumArtworkImage;
} else { // no album artwork
    NSLog(@"No ALBUM ARTWORK");
    _albumArtImageView.image = [UIImage imageNamed:@"kol.jpg"];
}

原文

I am currently developing an app that shows what artist, track and album art you're listening to in the Music player. All is going well apart from when I play a song with no artwork I want to be able to show my own default image (as opposed to showing a blank screen).

The below is how I imagined it SHOULD work however it never gets into the else as the itemArtwork is never nil!

You're help is appreciated.

Thanks, Ben

_item = [_player nowPlayingItem];
MPMediaItemArtwork *itemArtwork = [_item valueForProperty:MPMediaItemPropertyArtwork];

if (itemArtwork != nil) {
    UIImage *albumArtworkImage = [itemArtwork imageWithSize:CGSizeMake(250.0, 250.0)];
    _albumArtImageView.image = albumArtworkImage;
} else { // no album artwork
    NSLog(@"No ALBUM ARTWORK");
    _albumArtImageView.image = [UIImage imageNamed:@"kol.jpg"];
}

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森林迷了鹿 2024-12-18 05:59:03

MPMediaItemArtwork 似乎始终存在，即使对于没有插图的曲目也是如此。

我检测是否没有图像的方法是查看 MPMediaItemArtwork 的 imageWithSize 是否返回 NULL。

或者，稍微调整一下你的代码：

_item = [_player nowPlayingItem];
UIImage *albumArtworkImage = NULL;
MPMediaItemArtwork *itemArtwork = [_item valueForProperty:MPMediaItemPropertyArtwork];

if (itemArtwork != nil) {
    albumArtworkImage = [itemArtwork imageWithSize:CGSizeMake(250.0, 250.0)];
}

if (albumArtworkImage) {
    _albumArtImageView.image = albumArtworkImage;
} else { // no album artwork
    NSLog(@"No ALBUM ARTWORK");
    _albumArtImageView.image = [UIImage imageNamed:@"kol.jpg"];
}

我希望这些信息可以帮助你（如果是这样，请将此答案标记为选中:-)

MPMediaItemArtwork seem to always exist, even for tracks that don't have artwork.

The way I detect if there's no image is to see if MPMediaItemArtwork's imageWithSize returns NULL.

Or, rejiggering your code a bit:

_item = [_player nowPlayingItem];
UIImage *albumArtworkImage = NULL;
MPMediaItemArtwork *itemArtwork = [_item valueForProperty:MPMediaItemPropertyArtwork];

if (itemArtwork != nil) {
    albumArtworkImage = [itemArtwork imageWithSize:CGSizeMake(250.0, 250.0)];
}

if (albumArtworkImage) {
    _albumArtImageView.image = albumArtworkImage;
} else { // no album artwork
    NSLog(@"No ALBUM ARTWORK");
    _albumArtImageView.image = [UIImage imageNamed:@"kol.jpg"];
}

I hope this info helps you out (and if so, mark this answer as checked :-)

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厌倦 2024-12-18 05:59:03

如果您只需要检查艺术品是否存在（而不可能抓取图像，这会消耗大量 CPU 周期），您还可以检查 itemArtwork.bounds 属性。如果艺术品不存在，则 bounds.size.width 和 bounds.size.height 属性将为 0：

MPMediaItemArtwork *artwork = [_item valueForProperty:MPMediaItemPropertyArtwork];
BOOL hasArtwork = (artwork.bounds.size.width > 0 && artwork.bounds.size.height > 0);

If you just need to check if the artwork exists or not (without possibly grabbing the image, which burns a lot of CPU cycles) you can also check the itemArtwork.bounds property. If the artwork does not exist, the bounds.size.width and bounds.size.height properties will be 0:

MPMediaItemArtwork *artwork = [_item valueForProperty:MPMediaItemPropertyArtwork];
BOOL hasArtwork = (artwork.bounds.size.width > 0 && artwork.bounds.size.height > 0);

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