Instance Method


Returns the preferred filename extension for the specified Uniform Type Identifier (UTI).


func preferredFilenameExtension(forType typeName: String) -> String?



A string containing the UTI.

Return Value

The appropriate filename extension for typeName, or nil if no extension could be determined.


You can safely call this method from any thread of your app.

See Also

Manipulating Uniform Type Identifier Information

func type(ofFile: String) -> String

Returns the uniform type identifier of the specified file, if it can be determined.

func localizedDescription(forType: String) -> String?

Returns the localized description for the specified Uniform Type Identifier (UTI).

func filenameExtension(String, isValidForType: String) -> Bool

Returns whether the specified filename extension is appropriate for the Uniform Type Identifier (UTI).

func type(String, conformsToType: String) -> Bool

Returns a Boolean indicating that the first Uniform Type Identifier (UTI) conforms to the second UTI.

func urlForApplication(withBundleIdentifier: String) -> URL?

Returns the URL for the app with the specified identifier.