Animación de Segue personalizada

Question

Estoy tratando de usar un segue personalizado para realizar un tipo de animación de zoom. Cuando se ejecuta la transición, sourceViewController se pone negro, luego se produce el zoom.

Trató también de configurar el control pushViewController: en el bloque de finalización, pero la transición no se ejecuta en absoluto.

- (void)perform { 

    UIViewController *sourceViewController = (UIViewController *) self.sourceViewController; 
    UIViewController *destinationViewController = (UIViewController *) self.destinationViewController; 

    [destinationViewController.view setTransform:CGAffineTransformMakeScale(0.5,0.5)]; 
    [destinationViewController.view setAlpha:0.0]; 

    [UIView animateWithDuration:0.5 
          delay:0.0 
         options:UIViewAnimationCurveEaseOut 
        animations:^{ 
         [destinationViewController.view setTransform:CGAffineTransformMakeScale(1.0,1.0)]; 
         [destinationViewController.view setAlpha:1.0]; 
         [sourceViewController.navigationController pushViewController:destinationViewController animated:NO]; 
        } 
        completion:^(BOOL finished){ 
        }]; 

} 

¿Qué estoy haciendo mal?

Answer 1

Parece kludgy, pero puede intentar agregar el destinoViewController.view como una subvista antes de la animación y luego, cuando termine la animación, extráigala y vuelva a presionar sin animación. Resuelve la pantalla en negro antes de la transición, pero quizás no es perfecto, dependiendo de lo que quiere hacer con la barra de navegación, pero tal vez más cerca:

[sourceViewController.view addSubview:destinationViewController.view]; 
[destinationViewController.view setFrame:sourceViewController.view.window.frame]; 
[destinationViewController.view setTransform:CGAffineTransformMakeScale(0.5,0.5)]; 
[destinationViewController.view setAlpha:1.0]; 

[UIView animateWithDuration:0.5 
         delay:0.0 
        options:UIViewAnimationCurveEaseOut 
       animations:^{ 
        [destinationViewController.view setTransform:CGAffineTransformMakeScale(1.0,1.0)]; 
        [destinationViewController.view setAlpha:1.0]; 
       } 
       completion:^(BOOL finished){ 
        [destinationViewController.view removeFromSuperview]; 
        [sourceViewController.navigationController pushViewController:destinationViewController animated:NO]; 
       }]; 

---

Nota, el IOS eficaces 7, se usaría transiciones personalizadas . Para obtener más información, consulte la WWDC 2013 Custom Transitions Using View Controllers.

Por ejemplo, si tratamos de hacer una transición a medida con control de navegación, el primer controlador de vista especificaría como el delegado del mando de navegación:

self.navigationController.delegate = self; 

A continuación, se especificaría los animadores personalizados para empujar y el pop, respectivamente:

- (id<UIViewControllerAnimatedTransitioning>)navigationController:(UINavigationController *)navigationController 
            animationControllerForOperation:(UINavigationControllerOperation)operation 
               fromViewController:(UIViewController *)fromVC 
               toViewController:(UIViewController *)toVC 
{ 
    if (operation == UINavigationControllerOperationPush) { 
     return [[PushAnimator alloc] init]; 
    } else { 
     return [[PopAnimator alloc] init]; 
    } 
} 

y entonces lo que, obviamente, poner en práctica estos animadores:

@interface PushAnimator : NSObject <UIViewControllerAnimatedTransitioning> 

@end 

@implementation PushAnimator 

- (NSTimeInterval)transitionDuration:(id <UIViewControllerContextTransitioning>)transitionContext 
{ 
    return 0.5; 
} 

- (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext 
{ 
    UIViewController* toViewController = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey]; 
    UIViewController* fromViewController = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey]; 

    [[transitionContext containerView] addSubview:toViewController.view]; 
    toViewController.view.frame = fromViewController.view.frame; 
    toViewController.view.transform = CGAffineTransformMakeScale(0.5,0.5); 
    toViewController.view.alpha = 0.0; 

    [UIView animateWithDuration:[self transitionDuration:transitionContext] delay:0.0 options:0 animations:^{ 
     toViewController.view.transform = CGAffineTransformIdentity; 
     toViewController.view.alpha = 1.0; 
    } completion:^(BOOL finished) { 
     [fromViewController.view removeFromSuperview]; 
     [transitionContext completeTransition:![transitionContext transitionWasCancelled]]; 
    }]; 
} 

@end 

y

@interface PopAnimator : NSObject <UIViewControllerAnimatedTransitioning> 

@end 

@implementation PopAnimator 

- (NSTimeInterval)transitionDuration:(id <UIViewControllerContextTransitioning>)transitionContext 
{ 
    return 0.5; 
} 

- (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext 
{ 
    UIViewController* toViewController = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey]; 
    UIViewController* fromViewController = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey]; 

    [[transitionContext containerView] insertSubview:toViewController.view belowSubview:fromViewController.view]; 
    toViewController.view.frame = fromViewController.view.frame; 

    [UIView animateWithDuration:[self transitionDuration:transitionContext] delay:0.0 options:0 animations:^{ 
     fromViewController.view.transform = CGAffineTransformMakeScale(0.5,0.5); 
     fromViewController.view.alpha = 0.0; 
    } completion:^(BOOL finished) { 
     [fromViewController.view removeFromSuperview]; 
     [transitionContext completeTransition:![transitionContext transitionWasCancelled]]; 
    }]; 
} 

@end