如何在iOS8的自定義過渡動畫中「傳遞」持久性標籤？

我有一個自定義的視圖控制器之間的過渡動畫，並且我想要一個UILabel（或出現）在fromViewController和toViewController上都是相同的。如何在iOS8的自定義過渡動畫中「傳遞」持久性標籤？

我試過如下：

toViewController.nameLabel = fromViewController.nameLabel;

在下面的代碼的情況下卻得到了以下錯誤：

[UINavigationController nameLabel]: unrecognized selector sent to instance

我在做什麼錯？

- (void)animateTransition:(id <UIViewControllerContextTransitioning>)transitionContext { 
    // Grab the from and to view controllers from the context 
    HC_ExercisePageVC *fromViewController = (HC_ExercisePageVC *)[transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey]; 
    HC_TimerVC *toViewController = (HC_TimerVC *)[transitionContext viewControllerForKey:UITransitionContextToViewControllerKey]; 

    if (self.presenting) { 

     fromViewController.view.userInteractionEnabled = NO; 

     [transitionContext.containerView addSubview:toViewController.view]; 

     CGRect startFrame = endFrame; 
     startFrame.origin.y += 75; 
     toViewController.movingViews.frame = startFrame; 

     toViewController.nameLabel = fromViewController.nameLabel; 

     [UIView animateWithDuration:[self transitionDuration:transitionContext] animations:^{ 
      toViewController.movingViews.frame = endFrame; 
     } completion:^(BOOL finished) { 
      [transitionContext completeTransition:YES]; 
     }]; 
    } 
    else {

更新：繼@Gavin的建議，我取代了代碼：

// Grab the from and to view controllers from the context 
HC_ExercisePageVC *fromViewController = (HC_ExercisePageVC *)[transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey]; 
UINavigationController *toViewControllerNavigation = (id)[transitionContext viewControllerForKey:UITransitionContextToViewControllerKey]; 
HC_TimerVC * toViewController = (HC_TimerVC *)toViewControllerNavigation.viewControllers.firstObject;

但是，當我這樣做，我得到錯誤：

-[HC_TimerVC viewControllers]: unrecognized selector sent to instance

我總是掛上如何處理navcontrollers ...

來源

2015-03-02 Matt Miller

看起來像你的toViewController包含在UINavigationController內，因此它將返回作爲目的地。

所以你需要從導航控制器搶HC_TimerVC：

- (void)animateTransition:(id <UIViewControllerContextTransitioning>)transitionContext { 
    // Grab the from and to view controllers from the context 
    HC_ExercisePageVC *fromViewController = (HC_ExercisePageVC *)[transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey]; 
    UINavigationController *toViewControllerNavigation = (id)[transitionContext viewControllerForKey:UITransitionContextToViewControllerKey]; 
    HC_TimerVC * toViewController = toViewControllerNavigation.viewControllers.firstObject; 
    ....

來源

2015-03-02 23:09:39

如何在iOS8的自定義過渡動畫中「傳遞」持久性標籤？

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