Detecting Conflicts in iCloud
With all syncing technologies it is possible, even probable, to have conflicts. A conflict occurs when a document has been edited simultaneously on more than one device, and iCloud is unable to decide based on sync rules which version of the document should be current.
To get a conflict, test with two devices simultaneously. Turn on airplane mode on the first device, edit a note, and save. Edit and save the same note on the second device. Turn off airplane mode on the first device, and then attempt to edit the note again on the second device. A conflict will occur on the second device.
The UIDocument class has a document state that will indicate whether the document is in conflict or is able to be edited normally. ...
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