Presenting view controller with custom animation using only code (No Segue) - ios

Question

Here's what I am tring to do:
Implement a side nav that will slide in with custom animation from left to right
I am refering to this: https://www.thorntech.com/2016/03/ios-tutorial-make-interactive-slide-menu-swift/
But this and all other tutorials that implement this functionality use segues to present the view.
So their code goes here:
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?){
if let destinationViewController = segue.destinationViewController as? MenuViewController {
destinationViewController.transitioningDelegate = self
}
}
But this is not an option for me!
My entire view controller is created by code. Right now it's a dummy view controller and I am just trying to get it to slide in from left to right.
import UIKit
class SideNavVC: UIViewController {
static let sideNav = SideNavVC()
override func viewDidLoad() {
super.viewDidLoad()
let dummyView = UIView(frame: CGRect(x: 10, y: 200, width: 100, height: 100))
dummyView.backgroundColor = accentColor
view.addSubview(dummyView)
let closeBtn = UIButton(frame: CGRect(x: 4, y: 30, width: 200, height: 20))
closeBtn.addTarget(self, action: #selector(closeViewTapped), for: .touchUpInside)
closeBtn.setTitle("Close", for: .normal)
view.addSubview(closeBtn)
view.backgroundColor = confirmGreen
}
#objc func closeViewTapped(_ sender: UIButton) {
dismiss(animated: true, completion: nil)
}
}
And I am stuck on this step of the tutorial: https://www.thorntech.com/2016/03/ios-tutorial-make-interactive-slide-menu-swift/#four
This is how I am trying to set the delegate to self:
func addSlideGesture() {
let edgeSlide = UIScreenEdgePanGestureRecognizer(target: self, action: #selector(presentSideNav))
edgeSlide.edges = .left
view.addGestureRecognizer(edgeSlide)
}
#objc func presentSideNav() {
if presentedViewController != SideNavVC.sideNav {
SideNavVC.sideNav.transitioningDelegate = self
SideNavVC.sideNav.modalPresentationStyle = .custom
self.present(SideNavVC.sideNav, animated: true, completion: nil)
}
}
This is where I was implementing my delegate (MainVC is from where the user will slide right)
extension MainVC: UIViewControllerTransitioningDelegate {
func animationControllerForPresentedController(presented: UIViewController, presentingController presenting: UIViewController, sourceController source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
print("Source: \(source)")
print("Destination \(presenting)")
if source == self && presenting == SideNavVC.sideNav {
print("PRESENTING SIDE NAV")
return RevealSideNav()
}
return nil
}
func presentationController(forPresented presented: UIViewController, presenting: UIViewController?, source: UIViewController) -> UIPresentationController? {
//Added a break point here. It is hitting.
return nil
}
}
Since my delegate was not calling, I decided to add presentationController(forPresented,presenting,source) and put a break point in there which was hitting. So I suspect that I am missing some part of the code that needs to go in there.
When I googled it, I found this UIPresentationController tutorial https://www.raywenderlich.com/915-uipresentationcontroller-tutorial-getting-started
But as I went through it, the more and more it started confusing me.
I am sure there is some small part that I am missing. Because if it works when the delegte is set in prepare for segue, then it should also work when calling present(_,animated,completion)
Can someone point me in right direction? How do I get the custom animations to trigger and the delegate methods to call? Does anyone know a tutorial that teaches how to do this using just code and no storyboard?

Answer 1

I referred to answer by #Womble
"UIViewControllerTransitioningDelegate method not called in iOS 7"
Turns out the method that I was using was wrong and Xcode didn't warn of this. Kinda odd.
func animationController(forPresented presented: UIViewController,
presenting: UIViewController,
source: UIViewController)
-> UIViewControllerAnimatedTransitioning?
{
print("Source: \(source)")
print("Destination \(presenting)")
// ... return your cached controller object here.
return RevealSideNav()
}