한 가지 문제가 있으며 아래에 설명했습니다.

UIViewControllerContextTransitioning사용자 지정 전환에 사용 하고 있습니다.

두 개의 뷰 컨트롤러, 첫 번째 뷰 컨트롤러와 두 번째 뷰 컨트롤러가 있습니다.

이제 애니메이션과 함께 첫 번째 뷰 컨트롤러에 두 번째 뷰 컨트롤러를 추가하고 싶습니다. 이제 두 번째 뷰 컨트롤러가 투명하므로 두 번째 뷰 컨트롤러 아래에서 첫 번째 뷰 컨트롤러를 볼 수 있습니다.

하지만 첫 번째 뷰 컨트롤러가 보이지 않고 두 번째 뷰 컨트롤러 아래에는 검은 색 화면 만 보입니다.

-(void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext{
    self.transitionContext = transitionContext;
    if(self.isPresenting){
        [self executePresentationAnimation:transitionContext];
    }
    else{
       [self executeDismissalAnimation:transitionContext];
    }
  }

-(void)executePresentationAnimation:(id<UIViewControllerContextTransitioning>)transitionContext{
     UIView* inView = [transitionContext containerView];
     UIViewController* toViewController = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];

     UIViewController* fromViewController = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];

     CGRect offScreenFrame = inView.frame;
     offScreenFrame.origin.y = inView.frame.size.height;
     toViewController.view.frame = offScreenFrame;

    toViewController.view.backgroundColor = [UIColor clearColor];
    fromViewController.view.backgroundColor = [UIColor clearColor];
    inView.backgroundColor = [UIColor  clearColor];
    [inView insertSubview:toViewController.view aboveSubview:fromViewController.view];
     // [inView addSubview:toViewController.view];
    CFTimeInterval duration = self.presentationDuration;
    CFTimeInterval halfDuration = duration/2;

    CATransform3D t1 = [self firstTransform];
    CATransform3D t2 = [self secondTransformWithView:fromViewController.view];

    [UIView animateKeyframesWithDuration:halfDuration delay:0.0 options:UIViewKeyframeAnimationOptionCalculationModeLinear animations:^{

    [UIView addKeyframeWithRelativeStartTime:0.0f relativeDuration:0.5f animations:^{
        fromViewController.view.layer.transform = t1;
    }];

    [UIView addKeyframeWithRelativeStartTime:0.5f relativeDuration:0.5f animations:^{
        fromViewController.view.layer.transform = t2;
    }];
    } completion:^(BOOL finished) {
    }];


    [UIView animateWithDuration:duration delay:(halfDuration - (0.3*halfDuration)) usingSpringWithDamping:0.7f initialSpringVelocity:6.0f options:UIViewAnimationOptionCurveEaseIn animations:^{
        toViewController.view.frame = inView.frame;
    } completion:^(BOOL finished) {
        [self.transitionContext completeTransition:YES];
    }];
}

경우 [self.transitionContext completeTransition:YES];라고 갑자기 제 뷰 컨트롤러가 사라지고 초 뷰 컨트롤러 아래에 블랙 스크린 디스플레이.

아무도 아이디어가 있습니까? 감사.

답변

transitionContext.completeTransition(true)
UIApplication.sharedApplication().keyWindow!.addSubview(toViewController.view)

// Currently only two keys are defined by the
// system - UITransitionContextToViewControllerKey, and
// UITransitionContextFromViewControllerKey.
// Animators should not directly manipulate a view controller's views and should
// use viewForKey: to get views instead.
- (UIViewController *)viewControllerForKey:(NSString *)key;

- (UIView *)viewForTransitionContext:(id<UIViewControllerContextTransitioning>)transitionContext
{
#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 80000
    if ([transitionContext respondsToSelector:@selector(viewForKey:)]) {
        NSString *key = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey] == self ? UITransitionContextFromViewKey : UITransitionContextToViewKey;
        return [transitionContext viewForKey:key];
    } else {
        return self.view;
    }
#else
    return self.view;
#endif
}

- (UIPresentationController *)presentationControllerForPresentedViewController:(UIViewController *)presented presentingViewController:(UIViewController *)presenting sourceViewController:(UIViewController *)source;

initWithPresentedViewController:presented presentingViewController:presenting

if (self.presenting) {

    [transitionContext.containerView addSubview:toViewController.view];
    // your code

} else {
    // your code
}