How to refresh `UIView`

Let's say you have a UIView, and you want to update what it looks like after fetching some data.

So you're after the equivalent of tableView.reloadData(), but for a UIView.

A search on Stack Overflow suggests that you can use yourView.setNeedsLayout(). But that doesn't seem to work.

So then you also try yourView.layoutIfNeeded() as well. Nope.

What is happening?

You have likely done this:

var someView: UIView()

view.addSubview(someView)

// later in some async data call
someView = makeNewView()
someView.setNeedsLayout() // etc.. doesn't work

You have already added the view. So, now you need to do:

someView.removeFromSuperView()
someView = makeNewView()
view.addSubview(someView)

IMO it's not very nice. Much better if you can just render elements of the view, instead of completely replacing the view.

But.. sometimes it can't be helped.