UIView corner radius is sharp on small screens

Question

I have a button I'm setting its corner radius like this in ViewDidLoad():

self.myBtn.layer.cornerRadius = self.myBtn.frame.size.height / 2
self.myBtn.layer.masksToBounds = true

The result is great on the iPhone X. Screenshot:

But for some reason in devices that has smaller screens (like iPhone SE) the corners are really sharp and the result isn't what I want to achieve. Screenshot:

Does anybody know why is it happening?

Thanks!

This worked for me https://stackoverflow.com/a/40185598/3018183 — Ravisha Hesh, May 16 '18 at 17:40
My guess is the button was set up through constraints and you're setting the corner radius **before** the layout is finalized, so it is being calculated with a different size than the final one. Do this kind of stuff in `viewDidLayoutSubviews` instead. — Tamás Sengel, May 16 '18 at 17:41

score 2 · Accepted Answer · answered May 16 '18 at 17:42

Try to call your code in viewDidAppear (or better in viewDidLayoutSubviews)

It looks like you're using Autolayout. And it seems your button's layout depends on view's layout. The problem is: the size of viewController's view may be incorrect when viewDidLoad called (but it's corrected before viewDidAppear called).

UIView corner radius is sharp on small screens

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