Welcome to the Treehouse Community
Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.
Looking to learn something new?
Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.
Start your free trial
Steven Rayzman
2,423 PointsPop to Particular ViewController
How can I pop to a particular viewController after pressing a button, using swift.
1 Answer
Stone Preston
42,016 Pointsyou can pop to a specific index of the view controller stack using the popToViewController method:
// pops to the 3rd controller in the stack
navigationController!.popToViewController(navigationController!.viewControllers[2], animated: false)
Steven Rayzman
2,423 PointsSteven Rayzman
2,423 PointsWhen I tried your code I got an error saying that
'UINavigationController?' does not have a member named 'popToViewController'Stone Preston
42,016 PointsStone Preston
42,016 Pointsforce unwrap the navigationController optional by placing a ! after it
Steven Rayzman
2,423 PointsSteven Rayzman
2,423 PointsI have tried that, and I get the error:
Type 'AnyObject' cannot be implicitly downcast to 'UIViewController'; did you mean to use 'as' to force downcast?
Stone Preston
42,016 PointsStone Preston
42,016 Pointsso do exactly what that says and downcast the item in the array as a view controller:
navigationController!.popToViewController(navigationController!.viewControllers[2] as UIViewController, animated: false)Steven Rayzman
2,423 PointsSteven Rayzman
2,423 PointsThank you.