ipod - MPMediaItem 更改属性

Question

我尝试编写 Activator 动作来更改当前歌曲评分。我现在可以读取 MPMediaItemPropertyRating 属性并获得评级。但是我们如何从应用程序中更改它？

Answer 1

MPMediaItem您可以使用以下行更改 a 的评级：

[mediaItem setValue:[NSNumber numberWithInteger:rating] forKey:@"rating"];

在 iOS 7 中运行良好，无法确定是否适用于早期版本。

Answer 2

@sooper's answer works for local MPMediaItems on the device. But iOS doesnt sync these to iCloud Music Library or Apple Music.

Seems there is no way to change 'Star' Ratings so they are synced to iCloud Music Library. Any setValue:forKey: attempts change the Star Rating only locally. Such changes may be overwritten by any future iCloud Music Library sync.

We can change 'Love' Ratings of our Apple Music catalog and iCloud Music Library, using Apple Music Web APIs as pointed out by @AMGuru here.

And below is the Apple Documentation for those APIs:

https://developer.apple.com/documentation/applemusicapi/ratings

Answer 3

根据iPod Library Access Programming Guide “所有媒体项元数据都是只读的。”。