title: Does removeObserver() remove all observers?
body: <p>Does the following remove all NSNotificationCenter.defaultCenter there were added by name a view?</p>
  <pre><code>NotificationCenter.default.removeObserver(self)
  </code></pre>
  <p>If I have the following in the same view of viewDidLoad(), will they be removed with the single line above?</p>
  <pre><code>NotificationCenter.default.addObserver(self, selector: Selector((&quot;method1&quot;)), name: UITextField.textDidChangeNotification, object: nil)
  
  NotificationCenter.default.addObserver(self, selector: Selector((&quot;method2&quot;)), name: UITextView.textDidChangeNotification, object: nil)
  </code></pre>