make a swift custom animation

Question

I want to make an animation using swift. When the user is authenticated, the ViewController split from the middle, the top part goes up and the bottom part goes down.

Answer 1

You can use constraints and UIView.animate()

Assume there are two view in this view controller. Let's create two new outlet for top and bottom view constraint.

        @IBOutlet weak var topViewTopConstraint: NSLayoutConstraint!    
        @IBOutlet weak var bottomViewBottomConstraint: NSLayoutConstraint!

then when user click button, this function should call;

func showAnimation() {
    UIView.animate(withDuration: 1) {
        topViewTopConstraint.constant = -(topView.frame.height)
        bottomViewBottomConstraint.constant =  -(bottomView.frame.height)
        self.view.layoutIfNeeded()
    }
}

Also you can call completion handler with animate function. When animation finish you can load or show next view controller.