Subclass of UIButton with rounded corners (swift)

Question

Using swift, I'd like like to create a button with rounded corners. To make this re-usable, my preference is to subclass UIButton, and have come up with the following:

import Foundation
import UIKit

class LoginButton: UIButton {

  let corner_radius : CGFloat =  4.0

  override func drawRect(rect: CGRect) {
    super.drawRect(rect)
    self.layer.cornerRadius = corner_radius
  }

}

Unfortunately, this doesn't seem to work as I had hoped, even though it compiles fine. Perhaps I'm missing something - I'm very new to this!

Any ideas?

Answer 1

You need to use clipsToBounds to ensure that the containing view isn't drawn over the corner radius:

self.clipsToBounds = true

Answer 2

You need also to turn on the masksToBounds on the layer:

self.layer.masksToBounds = true