MPMediaItemCollection 删除选定的队列/集合？

发布于 2024-11-09 15:40:13 字数 600 浏览 5 评论 0原文

我目前正在查看 Apple 的 AddMusic 示例并播放在我开始将其重写到我的应用程序中之前，先对其进行处理。

我注意到它制作了自己的小歌曲播放列表。我想使用表格视图上的滑动操作来删除用户错误单击的歌曲。

我已经实现了滑动操作，但无法找出删除该特定行的方法？

任何想法都很棒，下面是添加它的代码。我尝试做相反的事情但没有运气。如果不可能的话我该怎么办？

干杯

MainViewController *mainViewController = (MainViewController *) self.delegate;
MPMediaItemCollection *currentQueue = mainViewController.userMediaItemCollection;
MPMediaItem *anItem = (MPMediaItem *)[currentQueue.items objectAtIndex: row];

原文

I am currently looking at Apple's AddMusic example and playing around with it before I start rewriting it into my application.

I noticed that it makes its own little playlist of the songs qued. I want to use the swipe action on the table view to remove songs that a use clicked by mistake.

I have implemented the swipe action but can't work out a way to delete that specific row?

Any idea would be great, below is the code to add it. I tried doing the reverse with no luck. If it's not possible how should I go about it?

Cheers

MainViewController *mainViewController = (MainViewController *) self.delegate;
MPMediaItemCollection *currentQueue = mainViewController.userMediaItemCollection;
MPMediaItem *anItem = (MPMediaItem *)[currentQueue.items objectAtIndex: row];

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洒一地阳光 2024-11-16 15:40:13

MPMediaItemCollection 是不可变的，即。您无法更改这些项目。您需要创建一个新项目，其中包含除要删除的项目之外的所有项目。请参阅下文：

NSArray* items = [currentQueue items];
NSMutableArray* array = [NSMutableArray arrayWithCapacity:[items count]];
[array addObjectsFromArray:items];
[array removeObjectAtIndex:row];
MPMediaItemCollection* newCollection = [MPMediaItemCollection collectionWithItems:array];

小心不要创建空集合。这是不允许的，MPMediaItemCollection 将引发异常。

An MPMediaItemCollection is immutable, ie. you can't change the items. You need to create a new one with all items less the one you want to remove. See below:

NSArray* items = [currentQueue items];
NSMutableArray* array = [NSMutableArray arrayWithCapacity:[items count]];
[array addObjectsFromArray:items];
[array removeObjectAtIndex:row];
MPMediaItemCollection* newCollection = [MPMediaItemCollection collectionWithItems:array];

Be careful to not create an empty collection. It's not allowed and the MPMediaItemCollection will raise an exception.

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