ALAssetsGroup 无效
我正在使用 AssetsLibrary 框架将资源保存到特定相册 (ALAssetsGroup)。
由于我经常使用 ALAssetsGroup （对于我想要保存资源的相册），我认为保留它是明智的，所以我不必（异步）迭代每次我需要的时候都通过小组。
检索/创建相册时，所有内容都会正确显示（对于 valueForProperty:），但该组似乎会在一段时间后自行失效，并且其所有属性都将返回 nil。另外， addAsset: 不起作用，所以我必须再次搜索相册（这次是通过 URL 搜索，但仍然是异步的）。
有没有办法解决这个问题（保持 ALAssetsGroup 有效）？
iOS 5 上发生了这种情况，并且库 (ALAssetsLibrary) 也被保留。 我正在使用设置器来确保我不会自己重置组。
I'm using AssetsLibrary framework for saving assets to a specific album (ALAssetsGroup).
Since I'm using the ALAssetsGroup (for the album where I want to save the assets) quite often, I figured it would be wise to retain it, so I don't have to iterate (asynchronously) through the groups each time I need it.
When retrieving/creating the album everything shows up correctly (for valueForProperty:), but the group seems to invalidate itself after some time, and all its properties will return nil. Also, addAsset: won't work on it, so I have to search for the album again (this time it's searched by its URL, but it's still asynchronous).
Is there a way around this (to keep the ALAssetsGroup valid)?
This is happening on iOS 5, and the library (ALAssetsLibrary) is retained as well.
I am using a setter to make sure that I don't reset the group myself.
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您需要为 ALAssetsLibrary 的 ALAssetsLibraryChangedNotification 添加观察者，并在收到它后重新查询任何缓存的 AL* 对象。这将在出售的 AL* 对象失效之前立即发布。
You need to add an observer for the ALAssetsLibraryChangedNotification for your ALAssetsLibrary and upon receiving it re-query for any of your cached AL* objects. That will be posted immediately before the vended AL* objects become invalid.