iosswiftswift3catransition

Swift Unable to present view controller from top to bottom


In my application I have to present the screen from Top to bottom and I have tried below code its giving the same normal presenting style.

        let screen = self.storyboard?.instantiateViewController(withIdentifier: "Screen1p5") as? Screen1p5
        let transition = CATransition()
        transition.duration = 0.5
        transition.type = kCATransitionPush
        transition.subtype = kCATransitionFromTop
        view.window!.layer.add(transition, forKey: kCATransition)
        self.present(screen!, animated: true, completion: nil)

Solution

  • For that you need to set subtype of CATransition to kCATransitionFromBottom and for batter animation set animated to false with present(_:animated:completion:).

    let screen = self.storyboard?.instantiateViewController(withIdentifier: "Screen1p5") as? Screen1p5
    let transition = CATransition()
    transition.duration = 0.5
    transition.type = kCATransitionPush
    transition.subtype = kCATransitionFromBottom
    view.window!.layer.add(transition, forKey: kCATransition)
    self.present(screen!, animated: false, completion: nil)
    

    For dismiss set subtype of CATransition to kCATransitionFromTop.

    let transition = CATransition()
    transition.duration = 0.5
    transition.type = kCATransitionPush
    transition.subtype = kCATransitionFromTop
    view.window!.layer.add(transition, forKey: kCATransition)
    self.dismiss(animated: false)