How to refresh header / footer with Diffable Data Source in both collectionView and tableView[enter image description here](https://i.sstatic.net/cWCRmTng.png)

I would like to implement it so that, like the iPhone’s default music app, it is shown as a large title at first and when you scroll up, it is shown as a small title. So I implemented it as below, but it is not smooth and hard like the music app. I tried animation, but it is not the same.
How should I implement it?

I am making a quiz app. Its button colour changes if clicked based on correct or wrong answer. But I want to restore the color to the original one after some delay. The color is changed but not restored to the default after the delay of 0.2 seconds.