Returns a Boolean value that indicates whether a popover should detach from its positioning view and become a separate window.
- macOS 10.10+
The popover that may be detached.
If you don't implement this method, it returns
false by default. If you return
true from this method, but you don't implement
detachable or you implement it to return
nil, a detachable window is created with the popover’s
An automatically created window has the same appearance as the detached popover. For example, if the popover's
content has a title, it will be bound to and displayed as the title of the detached window. When a popover is released in a detached state, it calls
popover on the delegate. When a detached popover is closed, calls to
popover, in addition to the related notifications, specify the reason