How to present view controller from left to right in iOS?

Question

When adding a new controller to the navigation stack:

self.navigationController!.pushViewController(PushedViewController(), animated: true)

it appears from the right:

How can I change the direction of animation to make it appear from the left?

Answer 1

Swift 5.1: Segue from different directions

Here is a simple extension for different segue directions. (Tested in Swift 5)

It looks like you want to use segueFromLeft() I added some other examples as well.

extension CATransition {

//New viewController will appear from bottom of screen.
func segueFromBottom() -> CATransition {
    self.duration = 0.375 //set the duration to whatever you'd like.
    self.timingFunction = CAMediaTimingFunction(name: CAMediaTimingFunctionName.easeInEaseOut)
    self.type = CATransitionType.moveIn
    self.subtype = CATransitionSubtype.fromTop
    return self
}
//New viewController will appear from top of screen.
func segueFromTop() -> CATransition {
    self.duration = 0.375 //set the duration to whatever you'd like.
    self.timingFunction = CAMediaTimingFunction(name: CAMediaTimingFunctionName.easeInEaseOut)
    self.type = CATransitionType.moveIn
    self.subtype = CATransitionSubtype.fromBottom
    return self
}
 //New viewController will appear from left side of screen.
func segueFromLeft() -> CATransition {
    self.duration = 0.1 //set the duration to whatever you'd like.
    self.timingFunction = CAMediaTimingFunction(name: CAMediaTimingFunctionName.easeInEaseOut)
    self.type = CATransitionType.moveIn
    self.subtype = CATransitionSubtype.fromLeft
    return self
}
//New viewController will pop from right side of screen.
func popFromRight() -> CATransition {
    self.duration = 0.1 //set the duration to whatever you'd like.
    self.timingFunction = CAMediaTimingFunction(name: CAMediaTimingFunctionName.easeInEaseOut)
    self.type = CATransitionType.reveal
    self.subtype = CATransitionSubtype.fromRight
    return self
}
//New viewController will appear from left side of screen.
func popFromLeft() -> CATransition {
    self.duration = 0.1 //set the duration to whatever you'd like.
    self.timingFunction = CAMediaTimingFunction(name: CAMediaTimingFunctionName.easeInEaseOut)
    self.type = CATransitionType.reveal
    self.subtype = CATransitionSubtype.fromLeft
    return self
   }
}

And here is how you implement the above extension:

    let nav = self.navigationController //grab an instance of the current navigationController
    DispatchQueue.main.async { //make sure all UI updates are on the main thread.
        nav?.view.layer.add(CATransition().segueFromLeft(), forKey: nil)
        nav?.pushViewController(YourViewController(), animated: false)
    }