init()

An initialized NSDocument object.

This initializer (the designated initializer) is invoked by each of the other NSDocument initialization methods.

You can override this method to perform initialization that must be done both when creating new empty documents and when opening existing documents. Your override must invoke super to initialize private NSDocument instance variables. It must never return nil. If an error can occur during object initialization, check for the error in an override of init(type:), init(contentsOf:ofType:), or init(for:withContentsOf:ofType:), because those methods can return NSError objects.