iOS: frame.size.width/2 doesn’t produce a circle on every device

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You can create an extension to apply the mask and border straight to your image so it will always work disregarding the screen size / scale:

edit/update:

Xcode 11 • Swift 5 or later

extension UIImage {
    var circleMask: UIImage? {
        let square = CGSize(width: min(size.width, size.height), height: min(size.width, size.height))
        let imageView = UIImageView(frame: .init(origin: .init(x: 0, y: 0), size: square))
        imageView.contentMode = .scaleAspectFill
        imageView.image = self
        imageView.layer.cornerRadius = square.width/2
        imageView.layer.borderColor = UIColor.white.cgColor
        imageView.layer.borderWidth = 5
        imageView.layer.masksToBounds = true
        UIGraphicsBeginImageContextWithOptions(imageView.bounds.size, false, scale)
        defer { UIGraphicsEndImageContext() }
        guard let context = UIGraphicsGetCurrentContext() else { return nil }
        imageView.layer.render(in: context)
        return UIGraphicsGetImageFromCurrentImageContext()
    }
}

imgAvatar.image = yourImage.circleMask

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