ios - Controlador de finalización para UINavigationController "pushViewController: animado"?
handler (9)
Actualmente el UINavigationController
no es compatible con esto. Pero está el UINavigationControllerDelegate
que puede usar.
Una manera fácil de lograr esto es subclasificando UINavigationController
y agregando una propiedad de bloque de terminación:
@interface PbNavigationController : UINavigationController <UINavigationControllerDelegate>
@property (nonatomic,copy) dispatch_block_t completionBlock;
@end
@implementation PbNavigationController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
self.delegate = self;
}
return self;
}
- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated {
NSLog(@"didShowViewController:%@", viewController);
if (self.completionBlock) {
self.completionBlock();
self.completionBlock = nil;
}
}
@end
Antes de presionar el nuevo controlador de vista, debe establecer el bloque de finalización:
UIViewController *vc = ...;
((PbNavigationController *)self.navigationController).completionBlock = ^ {
NSLog(@"COMPLETED");
};
[self.navigationController pushViewController:vc animated:YES];
Esta nueva subclase se puede asignar en Interface Builder o se puede utilizar mediante programación de esta manera:
PbNavigationController *nc = [[PbNavigationController alloc]initWithRootViewController:yourRootViewController];
Estoy a punto de crear una aplicación usando un UINavigationController
para presentar los siguientes controladores de vista. Con iOS5 hay un nuevo método para presentar UIViewControllers
:
presentViewController:animated:completion:
Ahora me pregunto por qué no hay un controlador de finalización para UINavigationController
? Solo hay
pushViewController:animated:
¿Es posible crear mi propio controlador de finalización como el nuevo presentViewController:animated:completion:
:?
Aquí está la versión Swift 4 con el Pop.
extension UINavigationController {
public func pushViewController(viewController: UIViewController,
animated: Bool,
completion: (() -> Void)?) {
CATransaction.begin()
CATransaction.setCompletionBlock(completion)
pushViewController(viewController, animated: animated)
CATransaction.commit()
}
public func popViewController(animated: Bool,
completion: (() -> Void)?) {
CATransaction.begin()
CATransaction.setCompletionBlock(completion)
popViewController(animated: animated)
CATransaction.commit()
}
}
Solo en caso de que alguien más necesitara esto.
Basado en la respuesta de par (que era la única que funcionaba con iOS9), pero más simple y con un elemento faltante (lo que podría haber llevado a que nunca se llamara a la finalización):
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()
}
}
}
Desde iOS 7.0, puede usar UIViewControllerTransitionCoordinator
para agregar un bloque de finalización de inserción:
UINavigationController *nav = self.navigationController;
[nav pushViewController:vc animated:YES];
id<UIViewControllerTransitionCoordinator> coordinator = vc.transitionCoordinator;
[coordinator animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext> _Nonnull context) {
} completion:^(id<UIViewControllerTransitionCoordinatorContext> _Nonnull context) {
NSLog(@"push completed");
}];
Para ampliar la respuesta de @Klaas (y como resultado de this pregunta) he agregado bloques de finalización directamente al método push:
@interface PbNavigationController : UINavigationController <UINavigationControllerDelegate>
@property (nonatomic,copy) dispatch_block_t completionBlock;
@property (nonatomic,strong) UIViewController * pushedVC;
@end
@implementation PbNavigationController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
self.delegate = self;
}
return self;
}
- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated {
NSLog(@"didShowViewController:%@", viewController);
if (self.completionBlock && self.pushedVC == viewController) {
self.completionBlock();
}
self.completionBlock = nil;
self.pushedVC = nil;
}
-(void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated {
if (self.pushedVC != viewController) {
self.pushedVC = nil;
self.completionBlock = nil;
}
}
-(void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated completion:(dispatch_block_t)completion {
self.pushedVC = viewController;
self.completionBlock = completion;
[self pushViewController:viewController animated:animated];
}
@end
Para ser utilizado de la siguiente manera:
UIViewController *vc = ...;
[(PbNavigationController *)self.navigationController pushViewController:vc animated:YES completion:^ {
NSLog(@"COMPLETED");
}];
Se necesita un poco más de tuberías para agregar este comportamiento y conservar la capacidad de establecer un delegado externo.
Aquí hay una implementación documentada que mantiene la funcionalidad de delegado:
Swift 2.0
extension UINavigationController : UINavigationControllerDelegate {
private struct AssociatedKeys {
static var currentCompletioObjectHandle = "currentCompletioObjectHandle"
}
typealias Completion = @convention(block) (UIViewController)->()
var completionBlock:Completion?{
get{
let chBlock = unsafeBitCast(objc_getAssociatedObject(self, &AssociatedKeys.currentCompletioObjectHandle), Completion.self)
return chBlock as Completion
}set{
if let newValue = newValue {
let newValueObj : AnyObject = unsafeBitCast(newValue, AnyObject.self)
objc_setAssociatedObject(self, &AssociatedKeys.currentCompletioObjectHandle, newValueObj, objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN_NONATOMIC)
}
}
}
func popToViewController(animated: Bool,comp:Completion){
if (self.delegate == nil){
self.delegate = self
}
completionBlock = comp
self.popViewControllerAnimated(true)
}
func pushViewController(viewController: UIViewController, comp:Completion) {
if (self.delegate == nil){
self.delegate = self
}
completionBlock = comp
self.pushViewController(viewController, animated: true)
}
public func navigationController(navigationController: UINavigationController, didShowViewController viewController: UIViewController, animated: Bool){
if let comp = completionBlock{
comp(viewController)
completionBlock = nil
self.delegate = nil
}
}
}
iOS 7+ Swift
EDITAR: He agregado una versión de Swift 3 de mi respuesta original. En esta versión eliminé la co-animación de ejemplo que se muestra en la versión de Swift 2, ya que parece haber confundido a muchas personas.
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()
}
)
}
}
Vea la respuesta de par para otra solución más actualizada
UINavigationController
animaciones de UINavigationController
se ejecutan con CoreAnimation
, por lo que tendría sentido encapsular el código dentro de CATransaction
y así establecer un bloque de finalización.
Swift :
Para swift, sugiero crear una extensión como tal
extension UINavigationController {
public func pushViewController(viewController: UIViewController,
animated: Bool,
completion: @escaping (() -> Void)?) {
CATransaction.begin()
CATransaction.setCompletionBlock(completion)
pushViewController(viewController, animated: animated)
CATransaction.commit()
}
}
Uso:
navigationController?.pushViewController(vc, animated: true) {
// Animation done
}
C objetivo
Encabezamiento:
#import <UIKit/UIKit.h>
@interface UINavigationController (CompletionHandler)
- (void)completionhandler_pushViewController:(UIViewController *)viewController
animated:(BOOL)animated
completion:(void (^)(void))completion;
@end
Implementación:
#import "UINavigationController+CompletionHandler.h"
#import <QuartzCore/QuartzCore.h>
@implementation UINavigationController (CompletionHandler)
- (void)completionhandler_pushViewController:(UIViewController *)viewController
animated:(BOOL)animated
completion:(void (^)(void))completion
{
[CATransaction begin];
[CATransaction setCompletionBlock:completion];
[self pushViewController:viewController animated:animated];
[CATransaction commit];
}
@end