NSFileManager Class Reference
里面有
Managing ICloud-Based Items
– setUbiquitous:itemAtURL:destinationURL:error:
– startDownloadingUbiquitousItemAtURL:error:
– isUbiquitousItemAtURL:
– URLForUbiquityContainerIdentifier:
– URLForPublishingUbiquitousItemAtURL:expirationDate:error:
– evictUbiquitousItemAtURL:error: