如何将MPMediaPlaylist的NSArray保存到NSUserDefaults

Question

我尝试保存我的MPMediaPlaylist NSArray

[[NSUserDefaults standardUserDefaults] setObject:self.playlistArray forKey:@"playlist"];
[[NSUserDefaults standardUserDefaults] synchronize];

但我有错误

-[NSUserDefaults setObject:forKey:]: Attempt to insert non-property value '(
    "<MPConcreteMediaPlaylist: 0x1e8614a0>"
)' of class '__NSArrayM'.  Note that dictionaries and arrays in property lists must also contain only property values.
2013-06-26 20:06:44.393 Fitness[5326:907] (
    "<MPConcreteMediaPlaylist: 0x1e8614a0>"
)

那么我该如何解决这个问题？

谢谢你的家伙

Answer 1

因为self.playlistArray是NSMutableArray.So你得到了这个错误。看看以下链接。

Saving a NSMutableArray using NSUserDefaults not working

NSUserDefaults NSMutable Array Not Saving Between Sessions

insert object in an NSMutableArray saved with NSUserDefaults