what method will called when we start to rotate device and after it finished

Question

i want to detect a rotation process on ipad programmatically. In this case i want to set a boolean into yes, when the rotation will begin, and set it false after the rotation di

Answer 1

SWIFT 5:

override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
    super.viewWillTransition(to: size, with: coordinator)
    coordinator.animate(alongsideTransition: { _ in
        // code at start of rotation
    }) { _ in
        // code at end of rotation
    }
}