How to make transition of a ViewController from Bottom to Top? - ios

Question

So here is a class for Slide in transition which adds a ViewController with animation from left to right and it works flawlessly I want a transition from bottom to top.
import UIKit
class SlideInTransition: NSObject, UIViewControllerAnimatedTransitioning {
var isPresenting = false
let dimmingView = UIView()
func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
return 0.3
}
func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
guard let toViewController = transitionContext.viewController(forKey: .to),
let fromViewController = transitionContext.viewController(forKey: .from) else { return }
let containerView = transitionContext.containerView
let finalWidth = toViewController.view.bounds.width * 0.8
let finalHeight = toViewController.view.bounds.height
if isPresenting {
// Add dimming view
dimmingView.backgroundColor = .black
dimmingView.alpha = 0.0
containerView.addSubview(dimmingView)
dimmingView.frame = containerView.bounds
// Add menu view controller to container
containerView.addSubview(toViewController.view)
// Init frame off the screen
toViewController.view.frame = CGRect(x: -finalWidth, y: 0, width: finalWidth, height: finalHeight)
}
// Move on screen
let transform = {
self.dimmingView.alpha = 0.5
toViewController.view.transform = CGAffineTransform(translationX: finalWidth, y: 0)
}
// Move back off screen
let identity = {
self.dimmingView.alpha = 0.0
fromViewController.view.transform = .identity
}
// Animation of the transition
let duration = transitionDuration(using: transitionContext)
let isCancelled = transitionContext.transitionWasCancelled
UIView.animate(withDuration: duration, animations: {
self.isPresenting ? transform() : identity()
}) { (_) in
transitionContext.completeTransition(!isCancelled)
}
}
}
To be honest I copied this code from somewhere a while ago and I don't have a source of it.
I'm fairly new to iOS so any help would be appreciated.

Answer 1

Try this,
class SlideInTransition: NSObject, UIViewControllerAnimatedTransitioning {
var isPresenting = false
let dimmingView = UIView()
func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
return 0.3
}
func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
guard let toViewController = transitionContext.viewController(forKey: .to),
let fromViewController = transitionContext.viewController(forKey: .from) else { return }
let containerView = transitionContext.containerView
let finalWidth = toViewController.view.bounds.width
let finalHeight = toViewController.view.bounds.height * 0.8
if isPresenting {
// Add dimming view
dimmingView.backgroundColor = .black
dimmingView.alpha = 0.0
containerView.addSubview(dimmingView)
dimmingView.frame = containerView.bounds
// Add menu view controller to container
containerView.addSubview(toViewController.view)
// Init frame off the screen
toViewController.view.frame = CGRect(x: 0, y: finalHeight, width: finalWidth, height: finalHeight)
}
// Move on screen
let transform = {
self.dimmingView.alpha = 0.5
toViewController.view.transform = CGAffineTransform(translationX: 0, y: -finalHeight)
}
// Move back off screen
let identity = {
self.dimmingView.alpha = 0.0
fromViewController.view.transform = .identity
}
// Animation of the transition
let duration = transitionDuration(using: transitionContext)
let isCancelled = transitionContext.transitionWasCancelled
UIView.animate(withDuration: duration, animations: {
self.isPresenting ? transform() : identity()
}) { (_) in
transitionContext.completeTransition(!isCancelled)
}
}
}