I am using a UISplitViewController, with a MasterViewController and DetailViewController, without UINavigationControllers.
Currenly the segue animation for master->detail, triggered by
performSegueWithIdentifier("showDetail", sender: self)
consists in the DetailViewController showing up from the bottom upwards.
How can I make that animation showing left-wards?
I've recently needed to have more control of how the segues are being performed, so I made my custom segue classes which all perform the transition in different directions. Here's one of the implementations:
Swift 2.x
override func perform() {
//credits to http://www.appcoda.com/custom-segue-animations/
let firstClassView = self.sourceViewController.view
let secondClassView = self.destinationViewController.view
let screenWidth = UIScreen.mainScreen().bounds.size.width
let screenHeight = UIScreen.mainScreen().bounds.size.height
secondClassView.frame = CGRectMake(screenWidth, 0, screenWidth, screenHeight)
if let window = UIApplication.sharedApplication().keyWindow {
window.insertSubview(secondClassView, aboveSubview: firstClassView)
UIView.animateWithDuration(0.4, animations: { () -> Void in
firstClassView.frame = CGRectOffset(firstClassView.frame, -screenWidth, 0)
secondClassView.frame = CGRectOffset(secondClassView.frame, -screenWidth, 0)
}) {(Finished) -> Void in
self.sourceViewController.navigationController?.pushViewController(self.destinationViewController, animated: false)
}
}
}
This one will have a "right to left" transition. You can modify this function for your needs by simply changing the initial and ending positions of the source and destination view controller.
Also don't forget that you need to mark your segue as "custom segue", and to assign the new class to it.
UPDATE: Added Swift 3 version
Swift 3
override func perform() {
//credits to http://www.appcoda.com/custom-segue-animations/
let firstClassView = self.source.view
let secondClassView = self.destination.view
let screenWidth = UIScreen.main.bounds.size.width
let screenHeight = UIScreen.main.bounds.size.height
secondClassView?.frame = CGRect(x: screenWidth, y: 0, width: screenWidth, height: screenHeight)
if let window = UIApplication.shared.keyWindow {
window.insertSubview(secondClassView!, aboveSubview: firstClassView!)
UIView.animate(withDuration: 0.4, animations: { () -> Void in
firstClassView?.frame = (firstClassView?.frame.offsetBy(dx: -screenWidth, dy: 0))!
secondClassView?.frame = (secondClassView?.frame.offsetBy(dx: -screenWidth, dy: 0))!
}, completion: {(Finished) -> Void in
self.source.navigationController?.pushViewController(self.destination, animated: false)
})
}
}
Embed your view controllers in UINavigationControllers.
Per the SplitViewController template: 
On smaller devices it's going to have to use the Master's navigationController.
Furthermore this question has been answered here and here and here
More from the View Controller Programming Guide:
There are two ways to display a view controller onscreen: embed it in a container view controller or present it. Container view controllers provide an app’s primary navigation….
In storyboards it's not that difficult to embed something in a navigation controller. Click on the view controller you want to embed, then Editor->embed in->navigation controller.
--Swift 3.0--
Armin's solution adapted for swift 3. New -> File -> Cocoa Touch Class -> Class: ... (Subclass: UIStoryboardSegue).
import UIKit
class SlideHorSegue: UIStoryboardSegue {
override func perform() {
//credits to http://www.appcoda.com/custom-segue-animations/
let firstClassView = self.source.view
let secondClassView = self.destination.view
let screenWidth = UIScreen.main.bounds.size.width
let screenHeight = UIScreen.main.bounds.size.height
secondClassView?.frame = CGRect(x: screenWidth, y: 0, width: screenWidth, height: screenHeight)
if let window = UIApplication.shared.keyWindow {
window.insertSubview(secondClassView!, aboveSubview: firstClassView!)
UIView.animate(withDuration: 0.4, animations: { () -> Void in
firstClassView?.frame = (firstClassView?.frame)!.offsetBy(dx: -screenWidth, dy: 0)
secondClassView?.frame = (secondClassView?.frame)!.offsetBy(dx: -screenWidth, dy: 0)
}) {(Finished) -> Void in
self.source.navigationController?.pushViewController(self.destination, animated: false)
}
}
}
}
In storyboard: mark your segue as "custom segue", and to assign the new class to it.
Note: If you have a UIScrollView in your detailesVC, this won't work.
It sounds as though the new view controller is presenting modally. If you embed the detailViewController into a UINavigationController and push the new controller it will animate from right to left and should show a back button too by default.
When you have a compact-width screen,"Show Detail" segue fall back to modal segue automatically.So your DetailViewController will appear vertically as the default modal segue.
You can use a UIViewControllerTransitioningDelegate to custom the animation of a modal segue.
Here is an example to achieve the horizontal animation:
1. set the transitioningDelegate and it's delegate method
class MasterViewController: UITableViewController,UIViewControllerTransitioningDelegate {
//prepare for segue
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "showDetail" {
let detailVC = segue.destinationViewController as! DetailViewController
detailVC.transitioningDelegate = self
// detailVC.detailItem = object//Configure detailVC
}
}
//UIViewControllerTransitioningDelegate
func animationControllerForPresentedController(presented: UIViewController, presentingController presenting: UIViewController, sourceController source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
return LeftTransition()
}
func animationControllerForDismissedController(dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
let leftTransiton = LeftTransition()
leftTransiton.dismiss = true
return leftTransiton
}
}
2: a custom UIViewControllerAnimatedTransitioning : LeftTransition
import UIKit
class LeftTransition: NSObject ,UIViewControllerAnimatedTransitioning {
var dismiss = false
func transitionDuration(transitionContext: UIViewControllerContextTransitioning?) -> NSTimeInterval {
return 2.0
}
func animateTransition(transitionContext: UIViewControllerContextTransitioning){
// Get the two view controllers
let fromVC = transitionContext.viewControllerForKey(UITransitionContextFromViewControllerKey)!
let toVC = transitionContext.viewControllerForKey(UITransitionContextToViewControllerKey)!
let containerView = transitionContext.containerView()!
var originRect = containerView.bounds
originRect.origin = CGPointMake(CGRectGetWidth(originRect), 0)
containerView.addSubview(fromVC.view)
containerView.addSubview(toVC.view)
if dismiss{
containerView.bringSubviewToFront(fromVC.view)
UIView.animateWithDuration(transitionDuration(transitionContext), animations: { () -> Void in
fromVC.view.frame = originRect
}, completion: { (_ ) -> Void in
fromVC.view.removeFromSuperview()
transitionContext.completeTransition(true )
})
}else{
toVC.view.frame = originRect
UIView.animateWithDuration(transitionDuration(transitionContext),
animations: { () -> Void in
toVC.view.center = containerView.center
}) { (_) -> Void in
fromVC.view.removeFromSuperview()
transitionContext.completeTransition(true )
}
}
}
}
