使用NSUserDefaults保留MPMediaItemCollection对象 [英] Persist a MPMediaItemCollection Object Using NSUserDefaults

问题描述

如何使用NSUserDefaults保留MPMediaItemCollection对象？ MPMediaItemCollection对象是从iPod中选择的一首歌曲。

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

我一直在努力奋斗数小时！任何人对NSUserDefaults有任何想法或替代方案，或者从MPMediaItemCollection或其他任何东西转换？！

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

谢谢......

推荐答案

首先将MPMediaItemCollection转换/编码为NSData对象，然后使用NSUserDefaults将其存储起来：

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];

从那里，您可以解码并使用应用中的任何其他地方....

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];

这篇关于使用NSUserDefaults保留MPMediaItemCollection对象的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！