Добавьте Navigation Controller to your initial view
1) Выберите нужные viewcontroller
2) Далее Editor—> Embed In —> Navigation Controller.
Push segues can only be used when the source controller is managed by an instance of UINavigationController
Добавьте Navigation Controller to your initial view
1) Выберите нужные viewcontroller
2) Далее Editor—> Embed In —> Navigation Controller.