What does the force parameter do in UIView.endEditing?

Question

In what situation self.view.endEditing(true) and self.view.endEditing(false) produce different results?

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Documents for func endEditing(force: Bool) -> Bool specify the following for the force parameter:

Indicate true to force the first responder to resign, regardless of whether he wants to do so.

Answer 1

As a comment mentioned, if canResignFirstResponder returns false, self.view.endEditing(true) will cause the control to lose focus, but self.view.endEditing(false) will not.