如何为滚动视图制作动画？

Question

如何在滚动视图中创建此类动画或自定义转场。您可以在GIF中看到预期的动画：https://gfycat.com/EveryBackLhasaapso

期望：

长按滚动视图时，它需要像gif动画一样展开，并且图标也需要放大。

我试图使用滚动视图来实现这一点，但是动画与预期的不匹配。

UIView.animate(withDuration: 0.2, delay: 0.2, usingSpringWithDamping: 0.5, initialSpringVelocity: 1, options: .curveEaseInOut, animations: {
            self.scrollViewHeight.constant = isExpanded == true ? ViewConstants.collectionViewHeightWithExpand : ViewConstants.collectionViewHeightWithcollapse
            self.scrollContentViewHeight.constant = isExpanded == true ? ViewConstants.collectionViewHeightWithExpand : ViewConstants.collectionViewHeightWithcollapse
            self.scrollContentView.transform = isExpanded == true ? CGAffineTransform(scaleX: 1.20, y: 1.20) : CGAffineTransform.identity
             self.view.layoutIfNeeded()
        }) { _ in}

Answer 1

现在运行您的应用程序。

self.scrollViewHeight.constant = isExpanded == true ? ViewConstants.collectionViewHeightWithExpand : ViewConstants.collectionViewHeightWithcollapse
self.scrollContentViewHeight.constant = isExpanded == true ? ViewConstants.collectionViewHeightWithExpand : ViewConstants.collectionViewHeightWithcollapse

UIView.animate(withDuration: 0.2, delay: 0.2, usingSpringWithDamping: 0.5, initialSpringVelocity: 1, options: .curveEaseInOut, animations: {
             self.scrollContentView.transform = isExpanded == true ? CGAffineTransform(scaleX: 1.20, y: 1.20) : CGAffineTransform.identity
             self.view.layoutIfNeeded()
        }) { _ in}