Instance Method


Returns the value of the resource property for the specified key.


func getPromisedItemResourceValue(_ value: AutoreleasingUnsafeMutablePointer<AnyObject?>, forKey key: URLResourceKey) throws



The location where the value for the resource property identified by key should be stored.


The name of one of the URL’s resource properties.


The error that occurred in the case that the resource value cannot be retrieved.

Return Value

true if value is successfully populated; otherwise, false.


This method behaves identically to getResourceValue(_:forKey:), but works on promised items. A promised item is not guaranteed to have its contents in the file system until you use a file coordinator to perform a coordinated read on its URL, which causes the contents to be downloaded or otherwise generated. Promised item URLs are returned by various APIs, including:

You must use this method instead of getResourceValue:forKey:error: for any URLs returned by these methods.

This method works for any resource value that is not tied to the item’s contents. Some keys, like contentAccessDateKey or generationIdentifierKey, do not return valid values. If you use one of these keys, the method returns true, but the value returns nil.

See Also

Working with Promised Items

func checkPromisedItemIsReachableAndReturnError(NSErrorPointer) -> Bool

Returns whether the promised item can be reached.

func promisedItemResourceValues(forKeys: [URLResourceKey]) -> [URLResourceKey : Any]

Returns the resource values for the properties identified by specified array of keys.