How to do a "show (e.g Push)" segue programatically without animation?

Question

How can I do a "show (e.g Push)" segue programatically without animation? None of the solutions I've found works the same way as the one in storyboard.

Answer 1

What the show (e.g. Push) segue does internally is to call
-[UIViewController showViewController:sender:]

Calling this method on your view controller itself, will trigger the appropriate way of presenting the view controller you are passing.

// Swift
self.showViewController(viewControllerToShow, sender: self)
// Objective-C
[self showViewController: viewControllerToShow sender: self];

The animation can be removed, by wrapping the call in an +[UIView performWithoutAnimation:] block.

// Swift
UIView.performWithoutAnimation {
    self.showViewController(viewControllerToShow, sender: self)
}
// Objective-C
[UIView performWithoutAnimation:^void () {
    [self showViewController: viewControllerToShow sender: self];
}]