iOS5 文件共享：识别文件何时添加到目录？
正如标题所说，我想知道如何识别新文件已添加到我的应用程序中，例如通过 iTunes 同步。在 iOS4 中，我使用了方法
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
或
- (void)application:(UIApplication *)application didBecomeActive
但从 iOS 5 开始，这就没用了，因为应用程序不会进入后台并在同步后变为活动状态。它保持活跃。那么有没有办法解决这个问题呢？
问候
拉尔夫
as the title says i wanna know how i can recognize that new file have been added to my App for example over an iTunes Sync. In iOS4 i used the methods
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
or
- (void)application:(UIApplication *)application didBecomeActive
But since iOS 5, this is useless because the app will not enter the Background and become active after a sync. It stays active. So is there a way to solve this?
regards
Ralf
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如果 iTunes 文件共享使用新的文件协调机制（尚未检查，但我假设它确实如此），您可以实现 NSFilePresenter 协议来获取文档目录中的更改通知。
通过实现
presentedSubitemDidAppearAtURL:和相关方法，应该可以对整个目录使用单个文件呈现器（请参阅NSFilePresenter文档）。If iTunes file sharing uses the new file coordination mechanism (haven't checked but I would assume that it does), you could implement the
NSFilePresenterprotocol to get notified of changes in the Documents directory.It should be possible to use a single file presenter for the entire directory by implementing
presentedSubitemDidAppearAtURL:and related methods (see "Handling Changes to a Presented Directory" in theNSFilePresenterdocumentation).通常我会创建一个计时器并定期检查与 iTunes 共享的目录中是否有新文件。我认为对于 iOS5 这是最好的方法。
iOS5 可以通过 WiFi 同步，因此您无法控制何时将文件添加到目录中
Usually I create a Timer and periodically check for new files in the Directory shared with ITunes. I think with iOS5 it's the best approach.
iOS5 can sync through WiFi so you don't have control about when a file will be added to the directory