How to present view controller from right to left in iOS using Swift

Question

I am using presentViewController to present new screen

let dashboardWorkout = DashboardWorkoutViewController()
presentViewController(dashboardWorkout, anima         


        

Answer 1

If you do want to use the "quick fix" CATransition method....

class AA: UIViewController

 func goToBB {

    let bb = .. instantiateViewcontroller, storyboard etc .. as! AlreadyOnboardLogin

    let tr = CATransition()
    tr.duration = 0.25
    tr.type = kCATransitionMoveIn // use "MoveIn" here
    tr.subtype = kCATransitionFromRight
    view.window!.layer.add(tr, forKey: kCATransition)

    present(bb, animated: false)
    bb.delegate, etc = set any other needed values
}

and then ...

func dismissingBB() {

    let tr = CATransition()
    tr.duration = 0.25
    tr.type = kCATransitionReveal // use "Reveal" here
    tr.subtype = kCATransitionFromLeft
    view.window!.layer.add(tr, forKey: kCATransition)

    dismiss(self) .. or dismiss(bb), or whatever
}

All of this is unfortunately not really correct :(

CATransition is not really made for doing this job.

Note you will get the annoying cross fade to black which unfortunately ruins the effect.

---

Many devs (like me) really don't like using NavigationController. Often, it is more flexible to just present in an ad-hoc manner as you go, particularly for unusual and complex apps. However, it's not difficult to "add" a nav controller.

1. simply on storyboard, go to the entry VC and click "embed -> in nav controller". Really that's it. Or,

2. in didFinishLaunchingWithOptions it's easy to build your nav controller if you prefer

3. you really don't even need to keep the variable anywhere, as .navigationController is always available as a property - easy.

Really, once you have a navigationController, it's trivial to do transitions between screens,

    let nextScreen = instantiateViewController etc as! NextScreen
    navigationController?
        .pushViewController(nextScreen, animated: true)

and you can pop.

That however only gives you the standard apple "dual push" effect...

(The old one slides off at a lower speed, as the new one slides on.)

Generally and surprisingly, you usually have to make the effort to do a full custom transition.

Even if you just want the simplest, most common, move-over/move-off transition, you do have to do a full custom transition.

Fortunately, to do that there's some cut and paste boilerplate code on this QA... https://stackoverflow.com/a/48081504/294884 . Happy new year 2018!