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我正在使用 MPMediaPickerController 选择一个音频文件,一旦选择,我希望它存储到我的应用程序沙箱中(文档目录中的某个位置)。有什么办法吗?

//I am implementing MPMediaPickerController delegates

- (void)mediaPicker:(MPMediaPickerController *)mediaPicker didPickMediaItems:(MPMediaItemCollection *)mediaItemCollection
{
    //Here I can store selected audio into my application sandbox, but don't know how?

    NSLog(@"%@",[mediaItemCollection description]);
}
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