专辑作品和代表作品

Question

如果专辑封面不存在，我正在尝试放置占位符图像。出于某种原因，来自representativeItem的图像永远不会为空，因此它只是分配一个空白的图片......

MPMediaItemArtwork *artwork = [[mediaListItem representativeItem] valueForProperty:MPMediaItemPropertyArtwork];

    if (artwork) {
         sModel.albumImage = [artwork imageWithSize: CGSizeMake (10, 10)];
    } else {
        sModel.albumImage = [UIImage imageNamed:@"Default_.png"]; //never enters
    }

Answer 1

找到解决方案，我是个天才;）

MPMediaItemArtwork *artwork = [[mediaListItem representativeItem] valueForProperty:MPMediaItemPropertyArtwork];

//If artwork has no size set place holder
if (CGSizeEqualToSize(artwork.bounds.size, CGSizeZero))
{
   sModel.albumImage = [UIImage imageNamed:DEFAULT_IMG];
}
else //Otherwise set the artwork found in the library. 
{
   sModel.albumImage = [artwork imageWithSize: CGSizeMake (SIZE_X, SIZE_Y)];
}