相关疑难解决方法(0)

我有一个问题,我在下面描述了它.

我正在使用UIViewControllerContextTransitioning进行自定义转换.

我有2个视图控制器,第一个视图控制器和第二个视图控制器.

现在我想在带有动画的第一个视图控制器上添加第二视图控制器.我已经实现了,现在我有第二视图控制器透明,所以我们可以看到第二视图控制器下面的第一个视图控制器.

但我无法看到第一个视图控制器,我只能看到第二视图控制器下方的黑屏.

这是代码.

-(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 …

我有一个 segue，它是通过一个按钮触发的，该按钮在当前上下文中以模态方式显示另一个视图控制器。我正在使用自定义类来自定义过渡，这是这样的：

class ShowAnimator: NSObject {
}


extension ShowAnimator: UIViewControllerAnimatedTransitioning {
func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
    return 0.5
}
func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
    guard
        let fromVC = transitionContext.viewController(forKey: .from),
        let toVC = transitionContext.viewController(forKey: .to) else {
            return
    }
    let containerView = transitionContext.containerView
    containerView.insertSubview(fromVC.view, belowSubview: toVC.view)
    let toFrame = transitionContext.finalFrame(for: toVC)
    let screenBounds = UIScreen.main.bounds
    let bottomLeftCorner = CGPoint(x: screenBounds.width, y: 0)
    let finalFrame = CGRect(origin: bottomLeftCorner, size: screenBounds.size)

    UIView.animate(withDuration: transitionDuration(using: transitionContext),
                   animations: {
                    fromVC.view.frame = finalFrame
    }, …