Persist a MPMediaItemCollection Object Using NSUserDefaults

问题

How do you persist a MPMediaItemCollection object using NSUserDefaults? The MPMediaItemCollection object is a single song selected from the iPod.

I have been struggling with this for hours! Anyone have any ideas or alternatives to NSUserDefaults or a conversion from MPMediaItemCollection, or anything?!

Thanks...

回答1:

First convert/encode the MPMediaItemCollection to an NSData Object and store it using NSUserDefaults using:

NSData *data = [NSKeyedArchiver archivedDataWithRootObject:mediaItemCollection];

    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    [defaults setObject:data forKey:@"someKey"];
    [defaults synchronize];

From there, you can decode and use anywhere else in your app....

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSData *data = [defaults objectForKey:@"someKey"];
MPMediaItemCollection *mediaItemCollection = [NSKeyedUnarchiver unarchiveObjectWithData:data];

来源：https://stackoverflow.com/questions/8248821/persist-a-mpmediaitemcollection-object-using-nsuserdefaults