自定义水平弹出过渡不工作，因为它应该

Question

我想创建一个自定义水平幻灯片UINavigationController过渡。推动画似乎很好。但是，当我试图弹出（并具有水平滑动回），其中只有一个空白的屏幕和动画时间后视图出现在它应该

func animateTransition(using transitionContext: UIViewControllerContextTransitioning) { 

     let container = transitionContext.containerView 
     let fromView = transitionContext.view(forKey: UITransitionContextViewKey.from)! 
     let toView = transitionContext.view(forKey: UITransitionContextViewKey.to)! 

     let offScreenRight = CGAffineTransform(translationX: container.frame.width, y: 0) 
     let offScreenLeft = CGAffineTransform(translationX: -container.frame.width, y: 0) 

     fromView.frame = transitionContext.initialFrame(for: transitionContext.viewController(forKey: .from)!) 
     toView.frame = transitionContext.finalFrame(for: transitionContext.viewController(forKey: .to)!) 

     toView.transform = isPresenting == true ? offScreenRight : offScreenLeft 



     container.addSubview(toView) 
     container.addSubview(fromView) 

     let duration = self.transitionDuration(using: transitionContext) 

     UIView.animate(withDuration: duration, delay: 0.0, usingSpringWithDamping: 0.5, initialSpringVelocity: 0.8, options: [], animations: { 

      fromView.transform = self.isPresenting == true ? offScreenLeft : offScreenRight 
      toView.transform = .identity 

     }, completion: { finished in 

      toView.frame = transitionContext.initialFrame(for: transitionContext.viewController(forKey: .from)!) 
      transitionContext.completeTransition(true) 
     }) 
    } 

Answer 1

看起来你需要重置你的意见的任何现有的转换。

func animateTransition(using transitionContext: UIViewControllerContextTransitioning) { 

    let container = transitionContext.containerView 
    let fromView = transitionContext.view(forKey: UITransitionContextViewKey.from)! 
    let toView = transitionContext.view(forKey: UITransitionContextViewKey.to)! 

    // add these two lines  
    fromView.transform = .identity 
    toView.transform = .identity 

    // ... the rest of your existing code