deinit {
// perform the deinitialization
}
From the Swift Documentation:
A deinitializer is called immediately before a class instance is
deallocated. You write deinitializers with the deinit keyword, similar
to how intializers are written with the init keyword. Deinitializers
are only available on class types.Typically you don’t need to perform manual clean-up when your
instances are deallocated. However, when you are working with your own
resources, you might need to perform some additional clean-up
yourself. For example, if you create a custom class to open a file and
write some data to it, you might need to close the file before the
class instance is deallocated.