Completion block for popViewController
I made a Swift
version with extensions with @JorisKluivers answer.
This will call a completion closure after the animation is done for both push
and pop
.
extension UINavigationController {
func popViewControllerWithHandler(completion: ()->()) {
CATransaction.begin()
CATransaction.setCompletionBlock(completion)
self.popViewControllerAnimated(true)
CATransaction.commit()
}
func pushViewController(viewController: UIViewController, completion: ()->()) {
CATransaction.begin()
CATransaction.setCompletionBlock(completion)
self.pushViewController(viewController, animated: true)
CATransaction.commit()
}
}
I know an answer has been accepted over two years ago, however this answer is incomplete.
There is no way to do what you're wanting out-of-the-box
This is technically correct because the UINavigationController
API doesn't offer any options for this. However by using the CoreAnimation framework it's possible to add a completion block to the underlying animation:
[CATransaction begin];
[CATransaction setCompletionBlock:^{
// handle completion here
}];
[self.navigationController popViewControllerAnimated:YES];
[CATransaction commit];
The completion block will be called as soon as the animation used by popViewControllerAnimated:
ends. This functionality has been available since iOS 4.
SWIFT 4.1
extension UINavigationController {
func pushToViewController(_ viewController: UIViewController, animated:Bool = true, completion: @escaping ()->()) {
CATransaction.begin()
CATransaction.setCompletionBlock(completion)
self.pushViewController(viewController, animated: animated)
CATransaction.commit()
}
func popViewController(animated:Bool = true, completion: @escaping ()->()) {
CATransaction.begin()
CATransaction.setCompletionBlock(completion)
self.popViewController(animated: animated)
CATransaction.commit()
}
func popToViewController(_ viewController: UIViewController, animated:Bool = true, completion: @escaping ()->()) {
CATransaction.begin()
CATransaction.setCompletionBlock(completion)
self.popToViewController(viewController, animated: animated)
CATransaction.commit()
}
func popToRootViewController(animated:Bool = true, completion: @escaping ()->()) {
CATransaction.begin()
CATransaction.setCompletionBlock(completion)
self.popToRootViewController(animated: animated)
CATransaction.commit()
}
}
Swift 5 version - works like a charm. Based on this answer
extension UINavigationController {
func pushViewController(viewController: UIViewController, animated: Bool, completion: @escaping () -> Void) {
pushViewController(viewController, animated: animated)
if animated, let coordinator = transitionCoordinator {
coordinator.animate(alongsideTransition: nil) { _ in
completion()
}
} else {
completion()
}
}
func popViewController(animated: Bool, completion: @escaping () -> Void) {
popViewController(animated: animated)
if animated, let coordinator = transitionCoordinator {
coordinator.animate(alongsideTransition: nil) { _ in
completion()
}
} else {
completion()
}
}
}