viewWillMove(toWindow:)
Informs the view that it’s being added to the view hierarchy of the specified window object (which may be nil).
Declaration
func viewWillMove(toWindow newWindow: NSWindow?)Parameters
- newWindow:
The window object that will be at the root of the view’s new view hierarchy. If the view is being removed from a window and there is no new window, this parameter is
nil.
Discussion
AppKit calls this method when the window of a view changes. It also calls it in cases where a view stays in the same window but its position in its view hierarchy changes. The view that moved also calls this method on all of its subviews, giving each of them a chance to respond to the change.
Subclasses can override this method to perform whatever actions are necessary. For example, when a window is deallocated, you can use this method to remove notification observers and bindings associated with the view.
When a window is deallocated, AppKit calls this method for each view in the window, passing nil for the newWindow parameter. AppKit does not necessarily call this method when closing a window, though. Closing a window usually just hides the window. Closed windows are deallocated only if their isReleasedWhenClosed method returns true.