iOS 7+ Swift
Swift 4:
// 2018.10.30 par:
// I've updated this answer with an asynchronous dispatch to the main queue
// when we're called without animation. This really should have been in the
// previous solutions I gave but I forgot to add it.
extension UINavigationController {
public func pushViewController(
_ viewController: UIViewController,
animated: Bool,
completion: @escaping () -> Void)
{
pushViewController(viewController, animated: animated)
guard animated, let coordinator = transitionCoordinator else {
DispatchQueue.main.async { completion() }
return
}
coordinator.animate(alongsideTransition: nil) { _ in completion() }
}
func popViewController(
animated: Bool,
completion: @escaping () -> Void)
{
popViewController(animated: animated)
guard animated, let coordinator = transitionCoordinator else {
DispatchQueue.main.async { completion() }
return
}
coordinator.animate(alongsideTransition: nil) { _ in completion() }
}
}
EDIT: Eu adicionei uma versão Swift 3 da minha resposta original. Nesta versão, removi o exemplo de co-animação mostrado na versão Swift 2, pois parece ter confundido muitas pessoas.
Swift 3:
import UIKit
// Swift 3 version, no co-animation (alongsideTransition parameter is nil)
extension UINavigationController {
public func pushViewController(
_ viewController: UIViewController,
animated: Bool,
completion: @escaping (Void) -> Void)
{
pushViewController(viewController, animated: animated)
guard animated, let coordinator = transitionCoordinator else {
completion()
return
}
coordinator.animate(alongsideTransition: nil) { _ in completion() }
}
}
Swift 2:
import UIKit
// Swift 2 Version, shows example co-animation (status bar update)
extension UINavigationController {
public func pushViewController(
viewController: UIViewController,
animated: Bool,
completion: Void -> Void)
{
pushViewController(viewController, animated: animated)
guard animated, let coordinator = transitionCoordinator() else {
completion()
return
}
coordinator.animateAlongsideTransition(
// pass nil here or do something animated if you'd like, e.g.:
{ context in
viewController.setNeedsStatusBarAppearanceUpdate()
},
completion: { context in
completion()
}
)
}
}
viewDidAppear:animated:
permite que você execute o código cada vez que seu controlador de visualização aparecer na tela (viewDidLoad
apenas a primeira vez que seu controlador de visualização é carregado)