Subscribe to last value after completed on RxSwift PublishSubject
<p>I'm looking for something like this:</p>

<pre><code>let observable = PublishSubject&lt;String&gt;()
observable.onNext("1")
observable.onCompleted()

_ = observable.subscribeNext { s in
    print(s)
}
</code></pre>

<p>So I want to subscribe to the Observable after it has already been completed and still get the values (or just the last value).</p>