objective-c - 为什么在标准存档上使用 UIDocument

Question

我使用过 UIDocument，但我不明白与使用 Archiving 相比有何优势？假设您不想使用 iCloud。

Answer 1

来自 Apple 的文档:http://developer.apple.com/library/ios/#documentation/uikit/reference/UIDocument_Class/UIDocument/UIDocument.html

Applications that make use of UIDocument and its underlying architecture get many benefits for their documents:

• Asynchronous reading and writing of data on a background queue. Your application's responsiveness to users is thus unaffected while reading and writing operations are taking place.
• Coordinated reading and writing of document files that is automatically integrated with cloud services. Support for discovering conflicts between different versions of a document (if that occurs).
• Safe-saving of document data by writing data first to a temporary file and then replacing the current document file with it.
• Automatic saving of document data at opportune moments; this mechanism includes support for dealing with suspend behaviors.

你也可以很好地与 NSUndoManager 集成