Instance Method


Sets the URL’s resource property for a given key to a given value.


func setResourceValue(_ value: Any?, forKey key: URLResourceKey) throws



The value for the resource property defined by key.


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


The error that occurred if the resource value could not be set.

Return Value

true if the resource property named key is successfully set to value; otherwise, false.


This method synchronously writes the new resource value out to disk. Attempts to set a read-only resource property or to set a resource property that is not supported by the resource are ignored and are not considered errors.

If an error occurs, this method returns false and populates the object pointer referenced by error with additional information.

See Also

Accessing Resource Values

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

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

func getResourceValue(AutoreleasingUnsafeMutablePointer<AnyObject?>, forKey: URLResourceKey)

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

func setResourceValues([URLResourceKey : Any])

Sets the URL’s resource properties for a given set of keys to a given set of values.

func removeAllCachedResourceValues()

Removes all cached resource values and temporary resource values from the URL object.

func removeCachedResourceValue(forKey: URLResourceKey)

Removes the cached resource value identified by a given key from the URL object.

func setTemporaryResourceValue(Any?, forKey: URLResourceKey)

Sets a temporary resource value on the URL object.

struct URLResourceKey

Keys that apply to file system URLs.