当高度增加时，如何平滑地绕过进度栏的角？

Question

I am trying to make a progress bar like this:

I used this SO post to learn how to round corners: Link

Which works great when your progress bar height doesn't go past 6. When I make my progress bar bigger using:

        progressBar.transform = progressBar.transform.scaledBy(x: 1, y: 8)

The result it:

It doesn't matter what the corner radius value is set to, it's not round. I am aware that making the corner radius value larger than the height can result in straight line corners but it doesn't matter what I set the corner radius to (I can set it to 1/2/4 and get similar results), the corners won't round.

Here is my code:

 progressBar.transform = progressBar.transform.scaledBy(x: 1, y: 8)
 progressBar.layer.cornerRadius = 8
 progressBar.clipsToBounds = true
 progressBar.layer.sublayers![1].cornerRadius = 8
 progressBar.subviews[1].clipsToBounds = true

(Corner radius and the y value are the same because the y is multiplied by 2)

Answer 1

I figured it out while writing this. You use corner radius like I have in the post above:

progressBar.layer.cornerRadius = 8
progressBar.clipsToBounds = true
progressBar.layer.sublayers![1].cornerRadius = 8
progressBar.subviews[1].clipsToBounds = true

To increase the size you set a height constraint on the progress bar: