Is hiding the search box at the top of a list on iOS good UX?

I'm working on an app with a list we want users to be able to search. I'm tempted to add the 'standard' search box out of sight above the list for iOS (like Mail and other stock apps etc).

However, I got thinking about whether this is really good UX. Every now and then I come across someone who still realised you can search mail, yet when you know it's likely to be there it's quite a nice clean UI approach.

Also aware Android and iOS have very different UX approaches on areas like this.

So is this a good idea? Given we'll have other things like sort and filter for out list too, are there any better approaches to take?

(Sorry if this has been asked before, I couldn't find it)