Xcode 12.5.1 with Swift version 5.4.2
I use the following code to do Transitioning Animation for viewController dismissing
enum PresentingDirection{
case top, right, left, bottom
var bounds: CGRect{
UIScreen.main.bounds
}
func offsetF(withFrame viewFrame: CGRect) -> CGRect{
let h = bounds.size.height
let w = bounds.size.width
switch self {
case .top:
return viewFrame.offsetBy(dx: 0, dy: -h)
case .bottom:
return viewFrame.offsetBy(dx: 0, dy: h)
case .left:
return viewFrame.offsetBy(dx: -w, dy: 0)
case .right:
return viewFrame.offsetBy(dx: w, dy: 0)
}
}
}
class CustomDismissController: NSObject, UIViewControllerAnimatedTransitioning{
fileprivate var presentingDirection: PresentingDirection
init(direction orientation: PresentingDirection) {
presentingDirection = orientation
}
func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
return 1
}
func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
guard let fromCtrl = transitionContext.viewController(forKey: UITransitionContextViewControllerKey.from),
let toCtrl = transitionContext.viewController(forKey: UITransitionContextViewControllerKey.to), let toView = toCtrl.view else{
return
}
let finalCtrlFrame = transitionContext.finalFrame(for: fromCtrl)
let containerView = transitionContext.containerView
fromCtrl.view.alpha = 0.5
toView.frame = presentingDirection.offsetF(withFrame: finalCtrlFrame)
containerView.bringSubviewToFront(toView)
UIView.animate(withDuration: transitionDuration(using: transitionContext), delay: 0.0, usingSpringWithDamping: 0.5, initialSpringVelocity: 0.0, options: .curveLinear) {
toView.frame = finalCtrlFrame
} completion: { _ in
let success = !transitionContext.transitionWasCancelled
transitionContext.completeTransition(success)
}
}
}
The above is the the best I can do.
I want the effect fromCtrl.view.alpha = 1
As I tested, fromCtrl.view.alpha = 0.5 is very important.
Without it, the second view controller stays , I can not see the first view controller's frame animation
It seems like to be an iOS bug
Any good idea?
I also tried snapshotView
func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
guard let fromCtrl = transitionContext.viewController(forKey: UITransitionContextViewControllerKey.from),
let toCtrl = transitionContext.viewController(forKey: UITransitionContextViewControllerKey.to), let toView = toCtrl.view, let snapshot = fromCtrl.view.snapshotView(afterScreenUpdates: false) else{
return
}
let finalCtrlFrame = transitionContext.finalFrame(for: fromCtrl)
let containerView = transitionContext.containerView
fromCtrl.view.isHidden = true
snapshot.frame = finalCtrlFrame
containerView.addSubview(snapshot)
toView.frame = presentingDirection.offsetF(withFrame: finalCtrlFrame)
containerView.bringSubviewToFront(toView)
UIView.animate(withDuration: transitionDuration(using: transitionContext), delay: 0.0, usingSpringWithDamping: 0.5, initialSpringVelocity: 0.0, options: .curveLinear) {
toView.frame = finalCtrlFrame
} completion: { _ in
let success = !transitionContext.transitionWasCancelled
transitionContext.completeTransition(success)
}
}
Not good.
full code in github
I solved.
The animation is the snapshot's thing.
Just layout to viewController's frame properly.
func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
guard let fromCtrl = transitionContext.viewController(forKey: UITransitionContextViewControllerKey.from),
let toCtrl = transitionContext.viewController(forKey: UITransitionContextViewControllerKey.to), let toView = toCtrl.view, let snapshot = toView.snapshotView(afterScreenUpdates: true) else{
return
}
let finalCtrlFrame = transitionContext.finalFrame(for: fromCtrl)
let containerView = transitionContext.containerView
snapshot.frame =
presentingDirection.offsetF(withFrame: finalCtrlFrame)
containerView.addSubview(snapshot)
containerView.bringSubviewToFront(toView)
toView.frame = finalCtrlFrame
UIView.animate(withDuration: transitionDuration(using: transitionContext), delay: 0.0, usingSpringWithDamping: 0.5, initialSpringVelocity: 0.0, options: .curveLinear) {
snapshot.frame = finalCtrlFrame
} completion: { _ in
snapshot.removeFromSuperview()
let success = !transitionContext.transitionWasCancelled
transitionContext.completeTransition(success)
}
}
Failed to try to put snapshot under toView
Related
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.
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)
}
}
}
I am doing a custom transition and if after present animation, device will be rotated and then destinationVC will be dismissed, originVC transform is not correct (not fulfil screen). If there is no device rotation, everything works perfectly fine. Does any one can help me?
Here is my code for present and dismiss animation:
func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
guard let originViewController = transitionContext.viewController(forKey: .from),
let destinationViewController = transitionContext.viewController(forKey: .to) else { return }
destinationViewController.view.transform = CGAffineTransform(translationX: 0, y: destinationViewController.view.frame.height)
let duration = transitionDuration(using: transitionContext)
UIView.animate(withDuration: duration, animations: {
destinationViewController.view.transform = CGAffineTransform(translationX: 0, y: 0)
originViewController.view.transform = originViewController.view.transform.scaledBy(x: 0.95, y: 0.95)
originViewController.view.layer.cornerRadius = 8.0
}, completion: { completed in
transitionContext.completeTransition(completed)
})
}
func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
guard let originViewController = transitionContext.viewController(forKey: .from),
let destinationViewController = transitionContext.viewController(forKey: .to) else { return }
let duration = transitionDuration(using: transitionContext)
UIView.animate(withDuration: duration, animations: {
originViewController.view.transform = CGAffineTransform(translationX: 0, y: destinationViewController.view.frame.height)
destinationViewController.view.transform = CGAffineTransform.identity
destinationViewController.view.layer.cornerRadius = 0.0
}, completion: { completed in
transitionContext.completeTransition(!transitionContext.transitionWasCancelled)
})
}
Screens:
Before present animation
After present animation
After device rotation
After dismiss animation
EDIT:
when I add destinationViewController.view.frame = transitionContext.finalFrame(for: destinationViewController) to dismiss animation everything seems works fine but I don't know if this is right way
Add a subView in ViewC1 with leading, top, bottom, trailing constraints.
Working full code
class ViewC1: UIViewController {
#IBAction func presentNow(_ sender: Any) {
let viewc = storyboard!.instantiateViewController(withIdentifier: "ViewC2") as! ViewC2
viewc.transitioningDelegate = viewc
viewc.modalPresentationStyle = .overCurrentContext
present(viewc, animated: true, completion: nil)
}
}
class ViewC2: UIViewController {
let pres = PresentAnimator()
let diss = DismissAnimator()
#IBAction func dissmisNow(_ sender: Any) {
dismiss(animated: true, completion: nil)
}
}
extension ViewC2: UIViewControllerTransitioningDelegate {
func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
return pres
}
func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
return diss
}
}
class PresentAnimator: NSObject, UIViewControllerAnimatedTransitioning {
func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
return 1.0
}
func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
guard let originViewController = transitionContext.viewController(forKey: .from),
let destinationViewController = transitionContext.viewController(forKey: .to) else { return }
transitionContext.containerView.addSubview(destinationViewController.view)
destinationViewController.view.frame = transitionContext.containerView.bounds
let originView = originViewController.view.subviews.first
destinationViewController.view.transform = CGAffineTransform(translationX: 0, y: destinationViewController.view.frame.height)
let duration = transitionDuration(using: transitionContext)
UIView.animate(withDuration: duration, animations: {
destinationViewController.view.transform = CGAffineTransform(translationX: 0, y: 0)
originView?.transform = CGAffineTransform(scaleX: 0.95, y: 0.95)
originView?.layer.cornerRadius = 8.0
}, completion: { completed in
transitionContext.completeTransition(completed)
})
}
}
class DismissAnimator: NSObject, UIViewControllerAnimatedTransitioning {
func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
return 1.0
}
func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
guard let originViewController = transitionContext.viewController(forKey: .from),
let destinationViewController = transitionContext.viewController(forKey: .to) else { return }
let originView = destinationViewController.view.subviews.first
let duration = transitionDuration(using: transitionContext)
UIView.animate(withDuration: duration, animations: {
originViewController.view.transform = CGAffineTransform(translationX: 0, y: destinationViewController.view.frame.height)
originView?.transform = CGAffineTransform.identity
originView?.layer.cornerRadius = 0.0
}, completion: { completed in
transitionContext.completeTransition(!transitionContext.transitionWasCancelled)
})
}
}
Update:
or you can override willRotate and didRotate if you dont want to use view.subviews.first
var prevTrans: CGAffineTransform?
override func willRotate(to toInterfaceOrientation: UIInterfaceOrientation, duration: TimeInterval) {
prevTrans = view.transform
view.transform = CGAffineTransform.identity
}
override func didRotate(from fromInterfaceOrientation: UIInterfaceOrientation) {
if let prevTrans = prevTrans {
view.transform = prevTrans
}
}
I built a class to implement a circular transition between view controllers. When I hit the button to navigate to the other view controller a circle starts growing from the button until it fills the screen with the new controller. When I dismiss the view controller I expected this circle to shrink down back to the original position. It's also working. The only problem is that when the dismiss is underway the back of the screen while the circle is shrinking is completely black and after the animation is completed the new viewController appears abruptly.
Here are some photos of the effect:
Here's the code of the custom class:
class customTransition: NSObject, UIViewControllerAnimatedTransitioning{
var duration: TimeInterval = 0.5
var startPoint = CGPoint.zero
var circle = UIView()
var circleColor = UIColor.white
enum transitMode: Int {
case presenting, dismissing
}
var transitionMode: transitMode = .presenting
func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
return duration
}
func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
let container = transitionContext.containerView
guard let to = transitionContext.view(forKey: UITransitionContextViewKey.to) else {return}
guard let from = transitionContext.view(forKey: UITransitionContextViewKey.from) else {return}
circleColor = to.backgroundColor ?? UIColor.white
if transitionMode == .presenting {
to.translatesAutoresizingMaskIntoConstraints = false
to.center = startPoint
circle = UIView()
circle.backgroundColor = circleColor
circle.frame = getFrameForCircle(rect: to.frame)
circle.layer.cornerRadius = circle.frame.width / 2
circle.transform = CGAffineTransform(scaleX: 0.01, y: 0.01)
circle.alpha = 0
circle.addSubview(to)
to.centerXAnchor.constraint(equalTo: circle.centerXAnchor).isActive = true
to.centerYAnchor.constraint(equalTo: circle.centerYAnchor).isActive = true
to.widthAnchor.constraint(equalToConstant: to.frame.width).isActive = true
to.heightAnchor.constraint(equalToConstant: to.frame.height).isActive = true
container.addSubview(circle)
UIView.animate(withDuration: duration, delay: 0, usingSpringWithDamping: 1, initialSpringVelocity: 0, options: UIView.AnimationOptions.curveLinear, animations: {
self.circle.center = from.center
self.circle.transform = CGAffineTransform.identity
self.circle.alpha = 1
}) { (sucess) in
transitionContext.completeTransition(sucess)
}
} else if transitionMode == .dismissing {
UIView.animate(withDuration: duration, delay: 0, usingSpringWithDamping: 1, initialSpringVelocity: 0, options: UIView.AnimationOptions.curveLinear, animations: {
self.circle.center = self.startPoint
self.circle.transform = CGAffineTransform(scaleX: 0.001, y: 0.001)
self.circle.alpha = 0
}) { (sucess) in
transitionContext.completeTransition(sucess)
}
}
}
func getFrameForCircle(rect: CGRect) -> CGRect{
let width = Float(rect.width)
let height = Float(rect.height)
let diameter = CGFloat(sqrtf(width * width + height * height))
let x: CGFloat = rect.midX - (diameter / 2)
let y: CGFloat = rect.midY - (diameter / 2)
return CGRect(x: x, y: y, width: diameter, height: diameter)
}
}
and the implementation...
let circularTransition = customTransition()
the call for the present view controller... I tried to set secondVC.modalPresentationStyle = UIModalPresentationStyle.overCurrentContext but when I set this line it ignores completely the animation transition I don't know why...
`
#objc func handlePresent(sender: UIButton){
let secondVC = nextVC()
secondVC.transitioningDelegate = self
present(secondVC, animated: true, completion: nil)
}
delegate methods:
func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
circularTransition.startPoint = presentButton.center
circularTransition.transitionMode = .presenting
return circularTransition
}
func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
circularTransition.transitionMode = .dismissing
circularTransition.startPoint = presentButton.center
return circularTransition
}
What am I missing here? Any suggestions?
No storyboard being used, just code.
If you don't use navigationController, it's necessary to use the .custom mode in the presentedviewController.
import UIKit
class TransViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
let circularTransition = customTransition()
#IBOutlet var presentButton : UIButton!
#IBAction func handlePresent(sender: UIButton){
if let secondVC = storyboard?.instantiateViewController(withIdentifier: "next"){
secondVC.modalPresentationStyle = .custom
secondVC.transitioningDelegate = self
present(secondVC, animated: true, completion: nil)
}
}
}
class BackViewController: UIViewController {
#IBAction func dismissMe(sender: UIButton){
self.dismiss(animated: true, completion: nil)
}
}
extension TransViewController: UIViewControllerTransitioningDelegate {
func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
circularTransition.startPoint = presentButton.center
circularTransition.transitionMode = .presenting
return circularTransition
}
func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
circularTransition.transitionMode = .dismissing
circularTransition.startPoint = presentButton.center
return circularTransition
}
}
If there is no from or to view, we have use the from and to view from containView.
func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
let container = transitionContext.containerView
var to : UIView!
var from : UIView!
to = transitionContext.view(forKey: UITransitionContextViewKey.to)
if to == nil {to = container}
from = transitionContext.view(forKey: UITransitionContextViewKey.from)
if from == nil {from = container}
The rest is same:
circleColor = to.backgroundColor ?? UIColor.white
if transitionMode == .presenting {
to.translatesAutoresizingMaskIntoConstraints = false
to.center = startPoint
circle = UIView()
circle.backgroundColor = circleColor
circle.frame = getFrameForCircle(rect: to.frame)
circle.layer.cornerRadius = circle.frame.width / 2
circle.transform = CGAffineTransform(scaleX: 0.01, y: 0.01)
circle.alpha = 0
circle.addSubview(to)
to.centerXAnchor.constraint(equalTo: circle.centerXAnchor).isActive = true
to.centerYAnchor.constraint(equalTo: circle.centerYAnchor).isActive = true
to.widthAnchor.constraint(equalToConstant: to.frame.width).isActive = true
to.heightAnchor.constraint(equalToConstant: to.frame.height).isActive = true
container.addSubview(circle)
UIView.animate(withDuration: duration, delay: 0, usingSpringWithDamping: 1, initialSpringVelocity: 0, options: UIView.AnimationOptions.curveLinear, animations: {
self.circle.center = from.center
self.circle.transform = CGAffineTransform.identity
self.circle.alpha = 1
}) { (sucess) in
transitionContext.completeTransition(sucess)
}
} else if transitionMode == .dismissing {
UIView.animate(withDuration: duration, delay: 0, usingSpringWithDamping: 1, initialSpringVelocity: 0, options: UIView.AnimationOptions.curveLinear, animations: {
self.circle.center = self.startPoint
self.circle.transform = CGAffineTransform(scaleX: 0.001, y: 0.001)
self.circle.alpha = 0
}) { (sucess) in
transitionContext.completeTransition(sucess)
}
}
}
I have written a custom animation controller to animate my view controller transition. Code as follows :
class PopupAnimationController: NSObject, UIViewControllerAnimatedTransitioning {
var backgroundColorView: UIView!
let duration: TimeInterval = 0.35
var dismiss = false
func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
return duration
}
func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
if !dismiss {
animatePresentTransition(using: transitionContext)
} else {
animateDismissTransition(using: transitionContext)
}
}
func animatePresentTransition(using transitionContext: UIViewControllerContextTransitioning) {
guard let fromVC = transitionContext.viewController(forKey: UITransitionContextViewControllerKey.from),
let toVC = transitionContext.viewController(forKey: UITransitionContextViewControllerKey.to) else {
return
}
let containerView = transitionContext.containerView
let finalFrameForVC = transitionContext.finalFrame(for: toVC) // What is this about?
let bounds = UIScreen.main.bounds
let snapshotView = fromVC.view.snapshotView(afterScreenUpdates: false)
snapshotView?.frame = bounds
backgroundColorView = UIView(frame: bounds)
backgroundColorView.backgroundColor = UIColor.black.withAlphaComponent(0)
// Put the window at the bottom of the screen
toVC.view.frame = finalFrameForVC.offsetBy(dx: 0, dy: bounds.size.height)
// Layer out the views
containerView.addSubview(snapshotView!)
containerView.addSubview(backgroundColorView)
containerView.addSubview(toVC.view)
// The animation happens here
UIView.animate(withDuration: duration, delay: 0, usingSpringWithDamping: 0.5, initialSpringVelocity: 0, options: [], animations: {
self.backgroundColorView.backgroundColor = UIColor.black.withAlphaComponent(0.4)
toVC.view.frame = finalFrameForVC
}, completion: {
finished in
transitionContext.completeTransition(true)
})
}
func animateDismissTransition(using transitionContext: UIViewControllerContextTransitioning) {
guard let fromVC = transitionContext.viewController(forKey: UITransitionContextViewControllerKey.from) else {
return
}
UIView.animate(withDuration: duration, delay: 0, usingSpringWithDamping: 0.5, initialSpringVelocity: 0, options: [], animations: {
self.backgroundColorView.backgroundColor = UIColor.black.withAlphaComponent(0.0)
let bounds = UIScreen.main.bounds
fromVC.view.frame = fromVC.view.frame.offsetBy(dx: 0, dy: bounds.size.height)
}, completion: {
finished in
transitionContext.completeTransition(true)
})
}
}
I have implemented the UIViewControllerTransitioningDelegate methods in the controller that will use this transition like so :
extension PopupViewController: UIViewControllerTransitioningDelegate {
func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
transitionAnimator.dismiss = false
return transitionAnimator
}
func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
transitionAnimator.dismiss = true
return transitionAnimator
}
}
When I'm not using a spring in the animation (eg damping set to 1) it works perfectly. However if I include spring in the animation like in this example the screen flashes black when the controller is dismissed:
Not sure why this is happening. Any ideas on what I might be doing wrong where? Any pointers would be greatly appreciated!
I saw a tutorial on Appcoda Transition ViewControllers transition a menu from up to bottom and I implemented it. Then, I tried to transition from bottom up using UIViewControllerContextTransitioning. But, doing it wrong cause I was setting the wrong values I think. Below is the code
func animateTransition(transitionContext: UIViewControllerContextTransitioning) {
//Get reference to our fromView, toView and the container view
let fromView = transitionContext.viewForKey(UITransitionContextFromViewKey)
let toView = transitionContext.viewForKey(UITransitionContextToViewKey)
//Setup the transform for sliding
let container = transitionContext.containerView()
let height = container?.frame.height
let moveDown = CGAffineTransformMakeTranslation(0, height! - 150)
let moveUp = CGAffineTransformMakeTranslation(0, -50)
//Add both views to the container view
if isPresenting {
toView?.transform = moveUp
snapShot = fromView?.snapshotViewAfterScreenUpdates(true)
container?.addSubview(toView!)
container?.addSubview(snapShot!)
}
//Perform the animation
UIView.animateWithDuration(duration, delay: 0.0, usingSpringWithDamping: 0.9, initialSpringVelocity: 0.3, options: UIViewAnimationOptions(rawValue: 0), animations: {
if self.isPresenting {
self.snapShot?.transform = moveDown
toView?.transform = CGAffineTransformIdentity
} else {
self.snapShot?.transform = CGAffineTransformIdentity
fromView?.transform = moveUp
}
}, completion: {finished in
transitionContext.completeTransition(true)
if !self.isPresenting {
self.snapShot?.removeFromSuperview()
}
})
}
func transitionDuration(transitionContext: UIViewControllerContextTransitioning?) -> NSTimeInterval {
return duration
}
func animateTransition(transitionContext: UIViewControllerContextTransitioning) {
// Get reference to our fromView, toView and the container view
let fromView = transitionContext.viewForKey(UITransitionContextFromViewKey)!
let toView = transitionContext.viewForKey(UITransitionContextToViewKey)!
// Set up the transform we'll use in the animation
guard let container = transitionContext.containerView() else {
return
}
let moveUp = CGAffineTransformMakeTranslation(0, container.frame.height + 50)
let moveDown = CGAffineTransformMakeTranslation(0, -250)
// Add both views to the container view
if isPresenting {
toView.transform = moveUp
snapshot = fromView.snapshotViewAfterScreenUpdates(true)
container.addSubview(toView)
container.addSubview(snapshot!)
}
// Perform the animation
UIView.animateWithDuration(duration, delay: 0.0, usingSpringWithDamping: 0.8, initialSpringVelocity: 0.8, options: [], animations: {
if self.isPresenting {
self.snapshot?.transform = moveDown
toView.transform = CGAffineTransformIdentity
} else {
self.snapshot?.transform = CGAffineTransformIdentity
fromView.transform = moveUp
}
}, completion: { finished in
transitionContext.completeTransition(true)
if !self.isPresenting {
self.snapshot?.removeFromSuperview()
}
})
}
This Should work. I checked out the tutorial you shared and you probably can't see the menu on the bottom because the way the MenuTableViewController.swift is set up on storyboard it is made so that the menu is always started from the top, so change that up and it should work perfectly fine. Let me know if you have any questions.