Instance Property インスタンスプロパティ

terminationHandler

A completion block the system invokes when the task completes.

Declaration 宣言 

var terminationHandler: ((Process) -> Void)? { get set }

Discussion 議論

The system passes the task object to the block to allow access to the task parameters, for example to determine if the task completed successfully.

This block isn’t guaranteed to be fully executed prior to waitUntilExit() returning.