Listen for window resize event in Swift / Objective-C

Question

Is it possible to iterate over all open windows of any application in OSX and listen to their resize events in Swift? I want to create custom window manager that would move

Answer 1

1. create an NSWindowController Class
2. Open your storyboard and find your window controller then set the Class as custom Class (identity inspect tab)
3. create an NSWindowDelegate Class with windowWillResize method
4. set the NSWindowDelegate instance as the window.delegate property of your NSWindowController instance

When user change window size,the windowWillResize method will be called.