How to round UIView?

Question

iOS

Hello, friends!
Faced a problem, could you explain to me how to round the UIView? What am I doing wrong in the code and how should I do it right? Please explain your answer so that I can understand and understand the whole point in the future.

Inside the UIView is a Button with a background image.
I want to achieve this effect:

Answer 1

view.layer.masksToBounds = true
Oh, and you're doing it in the wrong place. At the time your code is called, the images don't have their actual dimensions.
Move the rounding at least in viewDidApear, or better in viewDidLayoutSubviews
What are these methods and what to do in them can be found here -> CLICK
And a little more here -> CLICK