How can I get the height of a view after screen rotation in swift?

Question

There is a view, which I add constraints in storyboard so it will change its size after screen rotation, then how can I get its height and width after screen rotation? I tried this in a rotation event function like this:

override func viewWillTransitionToSize(size: CGSize, withTransitionCoordinator coordinator: UIViewControllerTransitionCoordinator) 
{
    println("h:\(view.bounds.size.height)")
    println("w:\(view.frame.size.width)")
}

but it only give me the size before rotation happen. I would like to get something like:

"now is landscape, height is...width is..." "now is portrait, height is ...width is..." in a rotation event function

Answer 1

The function you are using says "Will transition", that means the transition is not completed, so you can not fetch the new size.

You need to use :

dispatch_async(dispatch_get_main_queue()) { 
    println("h:\(view.bounds.size.height)")
    println("w:\(view.frame.size.width)")
             }

This code will be executed after the rotation was completed (in the main queue) and the new sizes are available.

Regards.