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Editorial Team
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Asked: 2026-06-04T08:08:40+00:00

I use iCloud to sync an user xml file between devices in my apps,

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I use iCloud to sync an user xml file between devices in my apps, with a UIDocument subclass, similar to the code from the question:http://stackoverflow.com/questions/7795629/icloud-basics-and-code-sample. but I am not sure when and how should I detect a conflict. I read the sdk doc and searched the internet but didn’t seem to find any information with detailed information. it seems we can use some code like
NSNumber* conflicted ;
[url getResourceValue:&conflicted forKey:NSURLUbiquitousItemHasUnresolvedConflictsKey error:nil];

but in my app, it seems always give a true value for “conflicted”?
also I am not sure when should I detect the conflict, my guess is before the contentsForType method of the UIDocument subclass is called. if anyone can give any hint that would be great.

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1 Answer

  1. Editorial Team

    You should observe the UIDocumentStateChangedNotification. If the documentState property of your document has the UIDocumentStateInConflict flag set, there is a conflict. Note that a document can be in multiple states simultaneously, so don’t check with ==, instead use something like if (document.state & UIDocumentStateInConflict) {....

    You can then get the conflicting versions with the otherVersionsOfItemAtURL: class method of NSFileVersion.

    You can find more detailed information in the chapter on resolving document conflicts in the Document-Based App Programming Guide for iOS.

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