获取当前正在播放的iPod图片的PNG大小

Question

我正在尝试以250x250的大小获取当前正在播放的iPod艺术品的PNG表示。但是我继续获得640x640的图像。代码如下。任何人都可以指出我正在制造的无疑的骨头错误吗？

- (NSData *) getNowPlayingPng
{
// Assume that there is no artwork for the media item.
UIImage *artworkImage = [[UIImage alloc]init];

// Get the artwork from the current media item, if it has artwork.
MPMediaItemArtwork *artwork = [iPodController.nowPlayingItem valueForProperty: MPMediaItemPropertyArtwork];

// Obtain a UIImage object from the MPMediaItemArtwork object
if (artwork) {
    artworkImage = [artwork imageWithSize:CGSizeMake(250.00, 250.00)];
}
NSData *pngimage = UIImagePNGRepresentation(artworkImage);
return pngimage;

}

Answer 1

我正在做类似的事情，并使用相同的代码为artworkImage。是否有特定原因需要转换为PNG？我只是使用UIImageView组件来显示图稿。

     MPMediaItemArtwork *artwork = [self.nowPlaying valueForProperty: MPMediaItemPropertyArtwork];

   self.audioImageView.image = [artwork imageWithSize:(CGSizeMake(320, 320))];